spau 121 c overvoltage and undervoltage relay - abb ltd · spau 121 c overvoltage and undervoltage...

RS 612 Ser.No.

SPAU 121 C

2

5

1307

fn = 50Hz

60Hz

12345678

/ >tt

n )( >n )( <

</tt%[ ]%[ ]

Uaux

80...265V ~–

18...80V –

SPCU 1C1

REGISTERS

0 0 0 0

12345678

0 1

SGR

n/U U

U

U

nU = 100V 110V

>

n/U Umax

n/U U<

n/U Umin

IRF

>U

U

1316

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

0 1

12345678

U

>U 

nU<U

1.2

[ ]sk

<t<

STEP

SPAU 121 COvervoltage and undervoltage relay

User´s manual and Technical description

2

SPAU 121 COvervoltage and

undervoltage relay

Contents Features .......................................................................................................................... 2Application ..................................................................................................................... 3Description of function .................................................................................................. 3Connections ................................................................................................................... 4Configuration of output relays ........................................................................................ 6Start and operation indicators ......................................................................................... 7Power supply and I/O module ........................................................................................ 7Technical data (modified 2002-04) ................................................................................. 8Examples of application ................................................................................................ 10Recorded data and fault analysis ................................................................................... 14Secondary injection testing ........................................................................................... 14Maintenance and repair ................................................................................................ 18Exchange and spare parts .............................................................................................. 18Ordering numbers ........................................................................................................ 18Order information ........................................................................................................ 18Dimensions and mounting ........................................................................................... 19

The complete manual for the combined overvoltage and undervoltage relay SPAU 121 Cincludes the following submanuals:

Overvoltage and undervoltage relay module SPCU 1C1 1MRS 750609-MUM ENGeneral characteristics of C-type relay modules 1MRS 750328-MUM EN

Features Combined overvoltage and undervoltage pro-tection relay

One-phase definite time or inverse time over-voltage stage

One-phase definite time or inverse time under-voltage stage

Control input for blocking of the function ofthe undervoltage stage by means of an externalcontrol signal

Automatic blocking of the undervoltage stageon loss of energizing voltage

Fully field-configurable output relay functions

Flexible matching of the relay to the intendedprotection application

Numerical display of setting values, measuredvalues, recorded fault values, indications etc.

Serial interface for bus connection module andoptical-fibre substation bus

Continuous self-supervision of relay hardwareand software for enhanced system reliability andavailability

Auto-diagnostic fault indication to facilitaterepair after detection of permanent internalrelay fault

Powerful software support for parametrizationand supervision of relays

The relay is a member of the SPACOM productfamily and PYRAMID®, ABB's coordinatedprotection and control concept.

1MRS 750608-MUM EN

Issued 1997-01-09Modified 2002-04-25Version B (replaces 34 SPAU 16 EN1)Checked MKApproved OL

Data subject to change without notice

3

The operation of the undervoltage stage can beblocked by means of an external control signal.

The relay forms a whole including an over-voltage stage, an undervoltage stage as well asflexible trip and alarm functions.

Application The voltage relay SPAU 121 C is intended to beused for overvoltage and undervoltage protectionand supervision in distribution substations. Gen-erally the relay measures the one phase-to-phasevoltage of the system.

The overvoltage stage and the undervoltagestage can be given definite time characteristic orinverse time characteristic.

The combined overvoltage and undervoltagerelay SPAU 121 C is a secondary relay that isconnected to the voltage transformers of theprotected object. The relay generally measuresthe one phase-to-phase voltage of the system.On operation the relay trips the circuit breakerand/or provides alarm, in accordance with theselected functions and given configuration ofthe relay.

When the phase-to-phase voltage exceeds the setstart value U> of the overvoltage stage, theovervoltage stage starts generating a start signalSS1. When, at definite time mode of operation,the set operate time t> or, at inverse time modeof operation, the calculated operate time t>, hasexpired, the overvoltage stage operates generat-ing a trip signal TS1. In the same way theundervoltage stage starts generating a start sig-nal SS2 when the measured value goes below thestart value U< and when the set operate time t<has expired, the undervoltage stage operates,generating a trip signal TS2.

The overvoltage stage can be given definite timecharacteristic or inverse time characteristic.When inverse time characteristic is selected twosets of curves named A and B are available.

The undervoltage stage can also be given defi-nite time characteristic or inverse time charac-teristic. When inverse time characteristic is se-lected one curve named C is available.

Operation of the undervoltage stage can beblocked by means of a control signal BS appliedto the opto-isolated external control input of therelay.

The overvoltage and undervoltage relay is pro-vided with two output relays for tripping andfour output relays for signalling purposes. Oneof the signalling relays is dedicated for the self-supervision system of the relay.

Description offunction

Fig. 1. Protection functions of the combined overvoltage and undervoltage relay SPAU 121 C.The encircled numbers refer to the ANSI (=American National Standards Institute) number of theconcerned protection function.

DEFINITE TIME OR INVERSE TIME OVERVOLTAGE STAGE

EXTERNAL BLOCKING FUNCTION FOR THE UNDERVOLTAGE STAGE

SERIAL COMMUNICATION

59

27

TRIP 1

TRIP 2

START 1

IRF

SIGNAL 1

SERIAL I/O

U__

BLOCKING

START 2

DEFINITE TIME OR INVERSE TIMEUNDERVOLTAGE STAGE

4

≅

SGR/1

U3

U3+ -

Uaux+-

(~)(~)

10 11 61 62

SPAU 121 C

_

BS

U2

1 1 1 1

D C B A

SGR

77 78 80 81 68 69 65 66

7 53 2 4 68

SP

A-Z

C_

Rx Tx

START1 SIGNAL1 TRIP2 TRIP1

100V110V

13 1415

IRF

L1L2L3

FE

70 7172

IRF

U < TS2

TS1

SGB/5

SS1

SS2

U1 I/O

t<,k<

t>,k>U >

73 74 75

START2

SERIALPORT

Connections

Fig. 2. Connection diagram for the combined overvoltage and undervoltage relay SPAU 121 C.

Uaux Auxiliary voltageA,B,C,D,E, F Output relaysIRF Self-supervision signalSS_ Start signalTS_ Trip signalSGR Switchgroup for configuring trip and alarm signalsSGB/5 Switch for routing a blocking signal to the undervoltage stageTRIP_ Trip outputSIGNAL1 Signal on relay operationSTART_ Start signal or signal on relay operationU1 Combined overvoltage and undervoltage relay module SPCU 1C1U2 Power supply and I/O module SPTU 240S1 or SPTU 48S1U3 I/O module SPTE 1E16SERIAL PORT Serial communication portSPA-ZC_ Bus connection moduleRx, Tx Receiving input (Rx) and transmitting output (Tx) of the bus connection module

5

Fig.3. Rear view of the overvoltage and undervoltage relay SPAU 121 C.

Specification of input and output terminals

Contacts Function

13-14 Energizing voltage U (100 V)13-15 Energizing voltage U (110 V)10-11 External blocking signal input BS61-62 Auxiliary power supply

When DC voltage is used the positive pole is connected to terminal 61.65-66 Trip output 1 for the U> and U< stage (TRIP 1)68-69 Trip output 2 for the U> and U< stage (TRIP 2)80-81 Signal on operation of the U> and U< stage (SIGNAL 1)77-78 Signal on operation of the U< stage, starting of the U> and U< stage (START 1)73-74-75 Starting of the U> stage (START 2). Under normal conditions the contact interval

73-75 is closed. When the U> stage starts or on loss of auxiliary supply, the contactinterval 74-75 closes.

70-71-72 Self-supervision (IRF) alarm output. Under normal conditions the contact interval70-72 is closed. When the auxiliary voltage disappears or an internal fault isdetected, the contact interval 71-72 closes.Protective earth terminal

The combined overvoltage and undervoltagerelay SPAU 121 C is connected to the opticalfibre communication bus by means of the busconnection module SPA-ZC 17 or SPA-ZC 21.The bus connection module is connected to theD-type connector (SERIAL PORT) on the rear

panel of the relay. The opto-connectors of theoptical fibres are plugged into the counter con-nectors Rx and Tx of the bus connection mod-ule. The selector switches for the communica-tion mode, which are located in the bus connec-tion module, are set in position "SPA".

Mad

e in

Fin

land

13

14

15

73

74

75

70

71

72

61

62

65

66

68

69

80

81

77

78

10

11

TTL

B47

0702

Rx

Tx

6

to output relay B. In addition, the followingfunctions can be selected with the switches of theSGR switchgroup on the front panel of the relay:

Configuration ofoutput relays

The start signal of the U> stage is firmly wired tooutput relay F and the trip signal to output relayA. The trip signal of the U< stage is firmly wired

Switch Function Factory User'sdefault settings

SGR/1 Routes the external blocking signal to stage U< 1

SGR/2 Routes the start signal of the U< stage to output relay D 1

SGR/3 Routes the start signal of the U> stage to output relay D 1

SGR/4 Routes the trip signal of the U< stage to output relay D 1

SGR/5 Routes the trip signal of the U< stage to output relay C 1

SGR/6 Routes the trip signal of the U< stage to output relay A 1

SGR/7 Routes the trip signals of the U> stage to output relay C 1

SGR/8 Routes the trip signals of the U> stage to output relay B 1

Circuit breakers can be controlled directly withoutput relay A and B. This enables two circuitbreakers to be controlled at the same time or

separate trip output relays can be configured forthe overvoltage protection and the undervoltageprotection.

7

RS 612 Ser.No.

SPAU 121 C

2

5

1307

fn = 50Hz

60Hz

12345678

/ >tt

n )( >n )( <

</tt%[ ]%[ ]

Uaux

80...265V ~–

18...80V –

SPCU 1C1

REGISTERS

0 0 0 0

12345678

0 1

SGR

n/U U

U

U

nU = 100V 110V

>

n/U Umax

n/U U<

n/U Umin

IRF

>U

U

1316

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

0 1

12345678

U

>U 

nU<U

1.2

[ ]sk

<t<

STEP

Start andoperationindicators

2. The yellow LED indicator U on the upperblack part of the front plate indicates, whenlit, that the corresponding voltage value iscurrently being displayed.

3. The red IRF indicator of the self-supervisionsystem indicates, when lit, that a permanentinternal relay fault has been detected. Thefault code appearing on the display once afault has been detected should be recordedand notified when service is ordered.

4. The green Uaux LED on the front panel is litwhen the power supply module operates prop-erly.

5. The LED indicator below a particular settingknob indicates, when lit, that the settingvalue of the knob is being displayed.

6. The LED of the SG1 switchgroup indicates,when lit, that the checksum of the switch-group is being displayed.

The start and operation indicators, the functionof the SG2 software switchgroup and the func-tions of the LED indicators during setting aredescribed in detail in the user's manual "Com-bined overvoltage and undervoltage relay mod-ule SPCU 1C1".

1. The relay module is provided with two opera-tion indicators designated U> and U< andlocated in the right bottom corner of thefront plate of the relay module. One indicatesoperation of the overvoltage stage and theother operation of the undervoltage stage.Yellow light indicates that the concernedstage has started and red light that the stagehas operated (tripped).

With the SG2 software switchgroup the startand trip indicators can be given a latchingfunction, which means that the LEDs remainlit, although the signal that caused operationreturns to normal. The indicators are resetwith the RESET push-button. An unresetindicator does not affect the operation of therelay.

Power supplyand I/O module

The combined power supply and I/O module(U2) is located behind the system front panel ofthe protection relay and can be withdrawn afterremoval of the system front panel. The powersupply and I/O module incorporates a powerunit, five output relays, the control circuits ofthe output relays and the electronic circuits ofthe external control input.

The power unit is transformer connected, thatis, the primary circuit and the secondary circuitsare galvanically isolated. The primary circuit isprotected by a slow 1 A fuse F1, located on thePC board of the module. When the powersource operates properly, the green Uaux LEDon the front panel is lit.

The power supply and I/O module is availablein two versions with different input voltageranges:

- type SPTU 240S1 Uaux = 80...265 V ac/dc- type SPTU 48S1 Uaux = 18...80 V dc

The voltage range of the power supply and I/Omodule inserted in the relay is marked on thesystem front panel of the relay.

8

Technical data(modified 2002-04)

Energizing inputs 100 V 110 VTerminals 13-14 13-15Rated voltage Un 100 V 110 VContinuous voltage withstand 2 x Un 2 x UnPower consumption at Un <0.5 VARated frequency fn acc. to order 50 Hz or 60 Hz

Output contact ratingsTrip contactsTerminals 65-66, 68-69Rated voltage 250 V ac/dcCarry continuously 5 AMake and carry for 0.5 s 30 AMake and carry for 3 s 15 ABreaking capacity for dc, when the controlcircuit time constant L/R ≤ 40 ms,at the control voltages- 220 V dc 1 A- 110 V dc 3 A- 48 V dc 5 A

Signalling contactsTerminals 70-71-72, 73-74-75

77-78, 80-81Rated voltage 250 V ac/dcCarry continuously 5 AMake and carry for 0.5 s 10 AMake and carry for 3 s 8 ABreaking capacity for dc, when the signallingcircuit time constant L/R < 40 ms,at the control voltages- 220 V dc 0.15 A- 110 V dc 0.25 A- 48 V dc 1 A

External control input (blocking)Terminals 10-11Control voltage 18…265 V dc or

80…265 V acCurrent consumption when active 2…20 mA

Auxiliary supply voltagePower supply and I/O modules and voltage ranges:- type SPTU 240 S1 80...265 V ac/dc- type SPTU 48 S1 18...80 V dcPower consumption under quiescent/operatingconditions ~4 W/~6 W

9

Combined overvoltage and undervoltage relay module SPCU 1C1Overvoltage stage U>Start voltage U> 0.8...1.6 x UnStart time 0.1 s, 1 s, 10 s or 60 sOperate time t> at definite timeoperation characteristic 0.05...10 sInverse time operation characteristic Curve sets A and B (see manual

1MRS 750609-MUM EN)Time multiplier k at inverse time characteristic 0.05…1.00

Undervoltage stage U<Start voltage U< 0.4...1.2 x UnStart time 0.1 s or 30 sOperate time t< 1…100 sInverse time operation characteristic Curve set C (see manual

1MRS 750609-MUM EN)Time multiplier k at inverse time characteristic 0.1…1.00

Data communicationTransmission mode Fibre optic serial busData code ASCIISelectable data transfer rates 300, 1200, 2400, 4800 or 9600 BdFibre optic bus connection module,powered from the host relay- for plastic fibre cables SPA-ZC 21 BB- for glass fibre cables SPA-ZC 21 MMFibre optic bus connection module witha built-in power supply unit- for plastic fibre cables SPA-ZC 17 BB- for glass fibre cables SPA-ZC 17 MM

Insulation Tests *)Dielectric test IEC 60255-5 2 kV, 50 Hz, 1 minImpulse voltage test IEC 60255-5 5 kV, 1.2/50 µs, 0.5 JInsulation resistance measurement IEC 60255-5 >100 MΩ, 500 Vdc

Electromagnetic Compatibility Tests *)High-frequency (1 MHz) burst disturbance testIEC 60255-22-1- common mode 2.5 kV- differential mode 1.0 kVElectrostatic discharge test IEC 60255-22-2 andIEC 61000-4-2- contact discharge 6 kV- air discharge 8 kVFast transient disturbance test IEC 60255-22-4and IEC 61000-4-4- power supply 4 kV- I/O ports 2 kV

Environmental conditionsSpecified ambient service temperature range -10...+55°CLong term damp heat withstand acc. to IEC 60068-2-3 <95%, +40°C, 56 d/aRelative humidity acc. to IEC 60068-2-30 93...95%, +55°C, 6 cyclesTransport and storage temperature range -40...+70°CDegree of protection by enclosurefor panel mounted relay IP 54Weight of relay including flush mounting case 3.0 kg

*) The tests do not apply to the serial port, which is used exclusively for the bus connection module.

10

L1L2L3

≅

SGR/1

U3

U3+ -

Uaux+-

(~)(~)

10 11 61 62

SPAU 121 C

_

BS

U2

1 1 1 1

D C B A

SGR

77 78 80 81 68 69 65 66

7 53 2 4 68

SP

A-Z

C_

Rx Tx

START1 SIGNAL1 TRIP2 TRIP1

100V110V

13 1415

IRF

FE

70 71 72

IRF

U < TS2

TS1

SGB/5

SS1

SS2

U1 I/O

t<,k<

t>,k>U >

73 74 75

START2

0

I

0

I

-

-

+

+

+

+ SERIALPORT

Examples ofapplication

Example 1.Supervision of thebusbar voltage

Fig. 4. Busbar voltage supervision with overvoltage and undervoltage relay SPAU 121 C.The selector switch positions are shown in the table on the following page.

The combined overvoltage and undervoltagerelay measures one phase-to-phase voltage.

Faults in the network or a faulty tap changer orvoltage regulator of a power transformer maycause abnormal busbar voltages. If both stages ofthe relay are given inverse time characteristic,the busbar circuit breaker will be tripped thefaster the higher the voltage deviation is.

At inverse time characteristic the relay generatesan alarm signal when the voltage exceeds or fallsbelow the set start voltage. If the measuredvoltage exceed or falls below the set start voltageby more than 6% the relay operates. The operatetime depends on how much the voltage exceedsor falls below the set start voltage.

The overvoltage stage provides an alarm signalwhen the overvoltage appears and trips thecircuit breaker, if the voltage continues to in-crease.

When the characteristic curve A is selected thealarm level can be set low enough and still thevoltage regulator is granted enough time tooperate even during severe voltage fluctuations.

If the power transformer may be exposed toovervoltage causing overexcitation, which, if theambient temperature is high, may cause thermaldamage, the HV side circuit breaker must beopened as well. In this application example theHV side trip signal could be obtained fromoutput relay A, terminals 65-66.

11

The undervoltage stage also trips the circuitbreaker. An unwanted operation of the under-voltage stage during an autoreclose cycle can beinhibited with switch SG1/6. If switch SG1/6 = 1the operation of the undervoltage stage is inhib-ited, when the voltage falls below 20% x Un.

An unwanted operation of the undervoltagestage due to the operation of a miniature circuitbreaker has been inhibited by routing a control

voltage from the auxiliary contact of the MCBto the control input 10-11 of the relay. SwitchSGB/5 on the printed circuit board must be inposition 1 as also switch SGR/1. The starting ofthe undervoltage stage is not blocked by theexternal control signal.

The selector switches of the voltage relay SPAU121 C can be set as follows:

Switch SG1/SPCU 1C1 SGB/SPCU 1C1 SGR

1 0 0 not in use 1 ext. blocking signal fromU> start time = 10 s miniature circuit breaker

2 1 0 not in use 1 starting of stage U< tooutput relay D

3 1 U> inv. time 0 not in use 0 no starting of stage U> tooutput relay D

4 0 curve A 0 not in use 0 no tripping of stage U< tooutput relay D

5 1 U< is blocked, if 1 blocking of t< 1 tripping of stage U< toU < 20% x Un output relay C

6 1 curve C 0 not in use 0 no tripping of stage U< tooutput relay A

7 1 U< inv. time 0 not in use 0 no tripping of stage U> tooutput relay C

8 1 U< start time = 30 s 0 not in use 1 tripping of stage U> tooutput relay B

Σ 246

When the switches are set as above, the outputrelays of the voltage relay SPAU 121 C providethe following signals:

Contact Function

65-66 Signal on operation of stage U>68-69 Operation of stage U< and U>80-81 Signal on operation of stage U<77-78 Starting of stage U<70-71-72 Self-supervision signal73-74-75 Starting of stage U>

12

≅

SGR/1

U3

U3+ -

Uaux+-

(~)(~)

10 11 61 62

SPAU 121 C

_

BS

U2

1 1 1 1

D C B A

SGR

77 78 80 81 68 69 65 66

7 53 2 4 68

START1 SIGNAL1 TRIP2

100V110V

13 1415

IRF

FE

70 71 72

IRF

U < TS2

TS1

SGB/5

SS1

SS2

U1 I/O

t<,k<

t>,k>U >

73 74 75

START2

L1L2L3

+

-

M

SERIALPORT

TRIP1

MOTOR FEEDERCIRCUITBREAKER

MAIN CIRCUIT BREAKER

Fig. 5. Motor undervoltage protection with voltage relay SPAU 121 C. The selector switch positionsare shown in the table on the following page.

Example 2.Motor undervoltageprotection

13

During short undervoltage situations motorsand other consumer devices are not discon-nected from the network. During long under-voltage situations the speed of the motors falls somuch that the motors have to be disconnectedfrom the network.

The undervoltage stage trips the circuit breakersof the motors connected to the busbar. Thisprevents several motors from starting simulta-neously on recovery of the voltage. The operatetime of the undervoltage stage must be longerthan the dead time of the high-speed autoreclosesequence of the transmission network in orderto prevent the motors from tripping.

In this example the voltage relay trips the motorfrom the network, if the undervoltage situationlasts longer than the set operate time t< of theundervoltage stage.

The overvoltage and undervoltage relay SPAU121 C can also be used for supervision of thevoltage regulator. If the measured voltage ex-

ceeds the set start level of the relay, the voltagerelay prevents the voltage regulator from step-ping to a higher voltage level.

An unwanted operation of the undervoltagestage when the miniature circuit breaker (MCB)trips has been inhibited by routing a controlsignal from the auxiliary contact of the MCB tothe relay's control input 10-11. Switch SGB/5on the printed circuit board of the voltage relaymodule should be in position 1 as should alsoswitch SGR/1.

The overvoltage stage protects the motors andtransformers connected to the busbars. Theovervoltage stage can be given inverse timecharacteristic. When the characteristic curve Bis selected the start voltage can be set relativelyhigh without rendering to long an operate timeat severe overvoltage.

The selector switches of the voltage relay SPAU121 C can be set as follows:

Switch SG1/SPCU 1C1 SGB/SPCU 1C1 SGR

1 1 0 not in use 1 ext. blocking signal fromU> start time = 1 s miniature circuit breaker

2 0 0 not in use 0 no starting of stage U< tooutput relay D

3 1 U> inv. time 0 not in use 0 no starting of stage U> tooutput relay D

4 1 curve B 0 not in use 1 tripping of stage U< tooutput relay D

5 0 U< not blocked, when 1 blocking of t< 0 no tripping of stage U< toU < 20% x Un output relay C

6 0 t< = 1…10 s 0 not in use 0 no tripping of stage U< tooutput relay A

7 0 U< definite time 0 not in use 1 tripping of stage U> tooutput relay C

8 0 U< start time = 0.1 s 0 not in use 0 no tripping of stage U> tooutput relay B

Σ 13

When the switches are set as above, the outputrelays of the voltage relay SPAU 121 C providethe following signals:

Contact Function

65-66 Tripping of the main circuit breaker by stage U>68-69 Tripping of the motor circuit breakers by stage U<80-81 Signal on tripping of the main circuit breaker by stage U>77-78 Signal on tripping of the motor circuit breakers by stage U<70-71-72 Self-supervision alarm signal73-74-75 Starting of the overvoltage stage U>, blocking signal for the voltage regulator

14

The registers of the overvoltage and under-voltage relay contain useful information aboutthe behaviour of the power network duringnormal service and in a fault situation.

During starting of the overvoltage stage themaximum value of the measured voltage is re-corded in register 1 as a multiple of the ratedvoltage. Any new starting of the overvoltagestage erases the old value from the register and anew value is recorded. On operation of theovervoltage stage the value gathering sequence isstopped and the highest measured value duringthe starting period is recorded.

Register 2 contains the maximum value of thevoltage measured after a relay reset as a multipleof the rated voltage. The recorded value is up-dated any time when the value of the measuredvoltage exceeds the recorded voltage value. Reg-ister 2 must be erased by a command given viathe serial bus or by pressing the STEP andRESET push-buttons simultaneously.

During starting of the undervoltage stage theminimum value of the measured voltage is re-corded in register 3 as a multiple of the ratedvoltage. Any new starting of the undervoltagestage erases the old value from the register and anew value is recorded. On operation of theundervoltage stage the value gathering sequenceis stopped and the lowest measured value duringthe starting period is recorded.

Register 4 contains the minimum value of thevoltage measured after a relay reset as a multipleof the rated voltage. The recorded value is up-dated any time when the value of the measuredvoltage falls below the recorded voltage value.

Register 4 must be erased by a command givenvia the serial bus or by pressing the STEP andRESET push-buttons simultaneously.

The number of startings, register 5 and 6, pro-vides information on the occurance ofovervoltage and undervoltage in the network. Itmust, however, be noted that when the starttime setting is 0.1 s, for instance, starting motorscan cause the undervoltage stage to start and thevalue of register 6 to be updated. In the sameway the overvoltage stage may start on tempo-rary overvoltages caused by, for instance, by avoltage regulator.

Registers 7 and 8 show the duration of the lateststart situation of the stages, expressed in per centof the set operate time or of the calculatedoperate time. Any new start erases the old valueand a new value is recorded. If the stage operates,the register value will be 100.

The values of register 7 and 8 provide informa-tion about the duration of the voltage variationsand how close to operation the overvoltage andundervoltage stages have been. Further infor-mation is obtained about the function of thevoltage regulator.

Register 2 and 4 provide information about thelimits of of fluctuation of the busbar voltageduring normal service.

Registers 1 and 3 as well as 7 and 8 facilitate thepost-fault analysis. These registers provide in-formation about the voltage levels in a networkdisturbance situation and how close to opera-tion the overvoltage and undervoltage stageshave been.

Recorded dataand fault analysis

Relay testing, both primary and secondary,should always be performed in accordance withnational regulations and instructions.

The protection relay incorporates an IRF func-tion that continuously monitors the internalstate of the relay and produces an alarm signal onthe detection of a fault. According to the manu-facturer’s recommendations the relay should besubmitted to secondary testing at five years’intervals. These tests should include the entireprotection chain from the instrument trans-formers to the circuit breakers.

The secondary testing described in this manualis based on the relay’s setting values duringnormal operation. If necessary, the secondary

testing can be extended by testing the protectionstages throughout their setting ranges.

As switch positions and setting values have to bealtered during the test procedure the correctpositions of switches and the setting values ofthe relay during normal operation conditionshave to be recorded, for instance, on the refer-ence card accompanying the relay.

For secondary testing the relay must be dis-connected from the voltage transformer circuitsand other secondary circuits by means ofdisconnectable terminal blocks or a test adapterfitted on the relay. A possible connection of therelay to the circuit breaker trip coil must benoted during the test.

Secondaryinjection testing

15

When the auxiliary voltage is connected to therelay, a self-testing program is carried out auto-matically. The self-testing program includes thewhole relay except for the matching transform-ers and the contacts of the output relays. Theoperational condition of the relay is tested usingordinary relay test equipment. The secondaryinjection test also includes the matching trans-formers, the output relays and the accuracy ofthe operate values.

When no relay test set is available the secondaryinjection test can be carried out with the follow-ing equipment:

- regulating transformer- isolating transformer, e.g. 220 V/220 V- voltmeter- stop watch or counter for time measurement- dc voltage source- switches and indicator lamps- supply and pilot wires- calibrated multimeter

Note the relay's rated voltage when measuringwires are connected to the terminals of the relay,see chapter Technical data, passage Energizinginputs.

When the test circuit has been completed andthe selector switches properly set, the auxiliaryvoltage can be connected to the relay. The

function of the test circuit can be verified bymeans of a multimeter.

Fig. 6. Secondary injection test circuit for the overvoltage and undervoltage relay SPAU 121 C.

≅

SG

R/1

U3

U3

+-

1011

6162

SP

AU

121

C

_

BS

U2

11

11

DC

BA

SG

R7778

8081

6869

6566

75

32

46

8

TR

IP1

100V110V

1314

15

IRF

FE

7071

72

IRF

U <

TS

2

TS

1

SG

B/5

SS

1

SS

2

U1

I/O

t<,k

<

t>,k

>U

>

7374

75

ST

AR

T2

SIG

NA

L1T

RIP

2IR

F

TIM

ER

S

TA

RT

S1

+(~

)

-(~

)

TIM

ER

ST

OP

S2

L2L3

L1

Uau

xB

S

V

NL1

L4

ST

AR

T1

16

The measurements can be performed at therated voltage of the relay.

The following relay functions are obtained:

Output relay Function(terminals)

A (65-66) Trip signal of stage U>B (68-69) (Trip signal of stage U<)C (80-81) Signal on operation of

stage U>D (77-78) Not in useE (70-71-72) Self-supervision alarmE (73-74-75) Start signal of stage U>

Checking the start function

Apply test voltage to terminals 13-14 or 13-15depending on the used energizing input. Closeswitch S1 and increase the voltage slowly untilthe overvoltage stage starts and indicator L2 islit. Read the start voltage value from the volt-meter.

Operate time t>

Definite time characteristic

If possible, set the test voltage at 2 x the set startvoltage of the overvoltage stage. Note! Themaximum voltage withstand of 2 x Un must notbe exceeded. The timer is started by switch S1,when it is closed and stopped by contact 65-66,when output relay A picks up.

The operation of output relay C is indicatedwith indicator L3, when it is lit.

When the relay starts the LED indicator U> inthe right corner of the front panel is lit withyellow colour. When the overvoltage stage oper-ates the LED indicator turns red.

Inverse time characteristic

When the relay has been set for inverse timecharacteristic, the test is performed by measur-ing the operate time at two voltage values, e.g.1,1 x U> and 1,4 x U> and by comparing theoperate times with the operate times obtainedfrom the characteristic curves.

Checkingthe matchingtransformers

Apply voltage to the relay and compare thevoltage value read from the display of the relaywith the voltage value shown by the voltmeter.

Set the switches of the SGR switchgroup asfollows before starting the test:

Switch Position

1 12 03 04 05 06 07 18 0

Checking theovervoltage stage

17

Operate time t<

Definite time characteristic

Set the test voltage at 0.5 times the set startvoltage of the undervoltage stage. The timer isstarted by switch S1, when it is closed andstopped by contact 68-69, when output relay Bpicks up.

Note! If the test voltage setting is below 0,2 x Un,switch SG1/6 must be set in position 0.

Inverse time characteristic

When the relay has been set for inverse timecharacteristic, the test is performed by measur-ing the operate time at two voltage values, e.g.0.9 x U< and 0.6 x U< and by comparing theoperate times with the operate times obtainedfrom the characteristic curves.

Checking the blocking function

Set switch SGB/5 of the relay module in posi-tion 1 (ON) and switch SGR/1 in position 1.

Check the blocking function by applying acontrol voltage (voltage value within the samerange as the auxiliary voltage) via switch S2 tothe control input 10-11. Set the test voltage at 2times the set start voltage of the undervoltagestage. Lower the voltage until the undervoltagestage starts and indicator L2 is lit but the under-voltage stage is not permitted to operate.

Set the switches of the SGR switchgroup asfollows before starting the test:

Switch Position

1 12 13 04 05 16 07 08 0

The following relay functions are obtained:

Output relay Function(terminals)

A (65-66) (Trip signal of stage U>)B (68-69) Trip signal of stage U<C (80-81) Signal on operation of

stage U<D (77-78) Start signal of stage U<E (70-71-72) Self-supervision signalF (73-74-75) (Start signal of stage U>)

Checking the start function

Set the test voltage at a value slightly above theset start voltage U< of the undervoltage stage.Close switch S1 and lower the voltage slowlyuntil the undervoltage stage starts and indicatorL2 is lit. Read the start voltage value from thevoltmeter.

Checking theundervoltage stage

The self-supervision system and the function ofthe IRF LED and the output relay E can betested in the Trip test mode described in manual

"General characteristics of C type relay mod-ules". Operation of output relay E is indicatedby L1.

Checking theselfsupervisionoutput relay (IRF)

18

If the relay fails in operation or if the operationvalues considerably differ from those stated inthe relay specifications, the relay should be givena proper overhaul. Minor measures, such asexchange of a faulty module, can be taken bypersonnel from the customer’s instrument work-shop, but major measures involving the elec-tronics are to be taken by the manufacturer.Please contact the manufacturer or his nearestrepresentative for further information aboutchecking, overhaul and calibration of the relay.

Note!The protection relays contain electronic circuitswhich are liable to serious damage due to elec-trostatic discharge. Before removing a module,ensure that you are at the same electrostaticpotential as the equipment by touching the case.

Note!Static protection relays are measuring instru-ments and should be handled with care andprotected against damp and mechanical stress,especially during transport and storage.

Maintenanceand repair

When used under the conditions specified inthe section "Technical data", the relay requirespractically no maintenance. The relay includesno parts or components that are sensitive toabnormal physical or electrical wear under nor-mal operating conditions.

If the environmental conditions on site differfrom those specified, as to temperature andhumidity, or if the atmosphere around the relaycontains chemically active gases or dust, therelay should be visually inspected during therelay secondary testing. The visual inspectionshould focus on:

- Signs of mechanical damage on relay case andterminals

- Dust accumulated inside the relay cover orcase; remove carefully with compressed air ora soft brush

- Signs of corrosion on terminals, case or com-ponents inside the relay

Exchange andspare parts

Overvoltage and undervoltage relay module SPCU 1C1Combined power supply and I/O module- Uaux = 80...265 V ac/dc SPTU 240S1- Uaux = 18...80 V dc SPTU 48S1Case (including I/O module) SPTK 1E16I/O module SPTE 1E16Bus connection module SPA-ZC 17_ or SPA-ZC 21_

Orderingnumbers

Combined overvoltage and undervoltage relay

SPAU 121 C RS 612 002 -AA, CA, DA, FA

Combined overvoltage and undervoltage relay with test adapter RTXP 18

SPAU 121 C RS 612 202 -AA, CA, DA, FA

The two last letters of the ordering number designate the rated frequency fn andthe Uaux voltage range of the relay as follows:

AA: fn = 50 Hz and Uaux = 80...265 V ac/dcCA: fn = 50 Hz and Uaux = 18...80 V dcDA: fn = 60 Hz and Uaux = 80...265 V ac/dcFA: fn = 60 Hz and Uaux = 18...80 V dc

Order information Example of order1. Quantity and type designation 15 pces relay SPAU 121 C2. Order number RS 612 002-AA3. Rated frequency fn = 50 Hz4. Auxiliary voltage Uaux = 110 V dc5. Accessories 15 bus connection modules SPA-ZC 21 MM

2 fibre optic cables SPA-ZF MM 10014 fibre optic cables SPA-ZF MM 5

6. Special requirements -

19

Dimensionsand mounting

The relay case is basically designed for flush-mounting. The mounting depth can be reducedwith an optional raising frame: type SPA-ZX111 reduces the depth behind the mountingpanel by 40 mm ,type SPA-ZX 112 reduces the

depth by 80 mm and type SPA-ZX 113 reducesthe depth by 120 mm. The relay can also bemounted in a case for surface mounting, typedesignation SPA-ZX 115.

Raising frame

SPA-ZX 111SPA-ZX 112SPA-ZX 113

176136 96

74114154

a b

a b

Panel cut-out

129 ±1

139

±1

142

162

136

3034

250

186216

Fig. 7. Dimensions of the overvoltage and undervoltage relay SPAU 121 C

The relay case is made of beige anodized alu-minium section.

A rubber gasket fitted on the mounting collarprovides an IP54 degree of protection betweenrelay case and mounting panel, when the relay isflush mounted.

The hinged cover of the relay case is made of aclear, UV stabilized polycarbonate, and pro-vided with a sealable fastening screw. A gasket

along the edge of the cover provides an IP54degree of protection between the case and thecover.

All input and output wires are connected to thescrew terminal blocks on the rear panel. Eachterminal is dimensioned for one max. 6 mm2

wire or two max. 2.5 mm2 wires. The D-typeconnector connects to the serial communica-tion bus.

IRF

>U

U

1316

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

0 1

12345678

U

>U 

nU<U

1.2

[ ]sk

<t<

STEP

SPCU 1C1Combined overvoltage and undervoltagerelay module

2

SPCU 1C1Combined overvoltage

and undervoltagerelay module

Contents Features .......................................................................................................................... 2Description of function .................................................................................................. 3Block diagram................................................................................................................. 4Front panel ..................................................................................................................... 5Start and operation indicators ......................................................................................... 5Settings ........................................................................................................................... 6Selector switches ............................................................................................................. 6Measured data ................................................................................................................ 8Recorded information ..................................................................................................... 8Register menu chart ...................................................................................................... 10Voltage/time characteristic ............................................................................................ 11Technical data .............................................................................................................. 13Event codes ................................................................................................................... 14Remote transfer data ..................................................................................................... 15Fault codes .................................................................................................................... 18

Features Single-phase voltage measuring protection relaymodule

Overvoltage stage with definite time or inversedefinite minimum time operation characteristic

Undervoltage stage with definite time or inversedefinite minimum time operation characteristic

Two sets of voltage/time curves available atinverse time operation characteristic of the un-dervoltage stage

External blocking of the operation of the under-voltage stage via a built-in control input

Automatic blocking of the undervoltage stageon loss of energizing voltage

Digital display of measured values, set valuesand recorded fault values

Serial communication capability for extensiveexchange of data with substation level equip-ment

Continuous self-supervision of hardware andsoftware for enhanced reliability and availability

Auto-diagnostic fault codes generated by themodule on detection of a permanent internalfault

1MRS 750609-MUM EN

Issued 97-01-10Modified 99-12-20Version C (replaces 34 SPCU 3 EN1)Checked KJApproved TK


3

The combined overvoltage and undervoltagerelay module SPCU 1C1 contains an over-voltage stage and an undervoltage stage. Theovervoltage stage and the undervoltage stage canbe given either definite time or inverse timecharacteristic.

If the voltage measured by the module exceedsthe set start value of the U> stage, the moduledelivers a start signal SS1 after the set start timehas expired. The start time of the U> stage isselected by means of switches SG1/1 and SG1/2,and four alternative values are available. Afterthe preset operate time t>, or at inverse timecharacteristic, after a time depending on thelevel of the overvoltage, the overvoltage stageoperates delivering a trip signal TS1.

The operation characteristic of the U> stage, i.e.definite time or inverse time characteristic, isselected with switch SG1/3. At definite timecharacteristic the setting range of the operatetime is selected with switches SG1/4. At inversetime characteristic two different sets of voltage/time curves, called A and B, can be selected withswitch SG1/4.

If the voltage measured by the module fallsbelow the set start value of the U< stage, themodule delivers a start signal SS2 after the setoperate time has expired. The start time of theU< stage is selected by means of switch SG1/8,and two alternative values are available. Afterthe preset operate time t<,or at inverse timecharacteristic, after a time depending on thelevel of the undervoltage, the undervoltage stageoperates delivering a trip signal TS2.

The operation characteristic of the U< stage, i.e.definite time or inverse time characteristic, isselected with switch SG1/7. At definite timecharacteristic the setting range of the operatingtime is selected with switch SG1/6. At inversetime characteristic one set of voltage/time curve,called C, is available.

To avoid unwanted operations, for instanceduring an auto-reclose sequence, starting andtripping of the undervoltage stage can be blockedby turning switch SG1/5 into the position 1.The blocking function is activated if the meas-ured signal falls below 0.2 x Un. This functionis illustrated in Fig. 1.

Descriptionof function

Fig. 1. Operation of the combined overvoltage and undervoltage relay module SPCU 1C1 whenthe function of the undervoltage stage is internally blocked (SG1/5 = 1).

Tripping (TS2) of the U< stage alone, may beblocked by routing a blocking signal BTS2 tothe undervoltage stage. The blockings areconfigured individually for the different protec-tion relays by means of the switchgroup SGB on

the PC board of the relay module. Instructionsfor setting the SGB switchgroup are given in theuser's manual of the concerned protection relay.Also see the signal diagram of the concernedprotection relay.

4

Block diagram

Fig. 2. Block diagram for the overvoltage and undervoltage relay module SPCU 1C1

U Measured voltageBS1, BS2, BS3 Blocking signalsBTS2 Blocking of the tripping of the U< stageSG1 Front panel selector switchgroupSG2 Software selector switchgroup for defining the mode of function of the

start and operation indicatorsSGB Selector switchgroup for configuration of blockings (on the PC-board)SS1 Start signal of the U> stageTS1 Trip signal of the U> stageSS2 Start signal of the U< stageTS2 Trip signal of the U< stageY Yellow indicatorR Red indicator

NOTE!All input and output signals of the relay moduleare not necessarily wired to the terminals of eachprotection relay including the overvoltage andundervoltage relay module. The signals wired

to the terminals are shown in the signal diagramof the concerned protection relay, see user'smanual for the concerned protection relay.

5

Front panel

IRF

>U

U

1316

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

0 1

12345678

U

>U 

nU

Setting knob and indicatorfor operate time or timemultiplier k> of stage U>

Setting knob and indicatorfor starting value of stage U<

Setting knob and indicatorfor operate time or timemultiplier k< of stage U<

Simplified device symbol

Self-supervision alarmindicator

Display

Display step push-button

Selector switchgroup SG1

Indicator for switchgroupSG1, SG2 and SG3

Reset push-button

Operation indicators

Type designationof relay module

Fig. 3. Front panel of the combined overvoltage and undervoltage relay module SPCU 1C1.

Each stage has its own yellow/red operationindicator. Yellow light indicates starting of theoperating stage and red light indicates that thestage has delivered a trip signal.

The four LED indicators can, independently ofone another, be given a self-reset or manual resetmode of operation by using switchgroup SG2.The manual reset mode means that the indica-tor remains lit after being switched on, althoughthe stage, which controls the indicator, resets. If,for instance, the yellow start indicator has beengiven self-reset mode of operation and the redoperation indicator manual-reset mode of op-eration, the yellow indicator is lit, when thestage starts and turns red if the stage operates.When the stage resets after operation the redindication remains lit. If the stage starts butresets before operation the yellow indicator is litduring starting and reset automatically whenthe stage resets. The indicators, which have beengiven the manual reset mode, are reset locally bypushing the RESET push-button on the front

panel or by remote control over the SPA bususing the command V101 or V102. See alsotable (for switchgroup SG3) on page 7 in chap-ter "Selector switches".

An unreset operation indicator does not affectthe protection functions of the relay module.The relay module is constantly operative, re-gardless of the indicators having been reset ornot.

The self-supervision alarm indicator IRF indi-cates that the self-supervision system has de-tected a permanent fault. The indicator is litwith red light shortly after a permanent internalfault has been detected. At the same time acontrol signal is put forward to the output relayof the self-supervision system. Additionally, inmost fault cases, a fault code indicating type offault appears on the display of the relay module.The fault code is to be recorded to facilitate thesubsequent fault location and repair actions.

Start andoperationindicators

6

lit, the setting value currently being shown onthe display.

U>/Un Start value of the U> stage as a multiple of the rated voltage of the relay energizing inputbeing used. Setting range 0.8...1.6 x Un

t> [s] Operate time of the U> stage, expressed in seconds, at definite time mode of operation.k> The required setting range, 0.05...1.00 s, 0.5...10.0 s, is selected with switch SG1/4.

At IDMT mode of operation the setting range of the multiplier k> is 0.05...1.00

U</Un Start value of the U< stage as a multiple of the rated voltage of the relay energizing inputbeing used. Setting range 0.4...1.2 x Un

t< [s] Operate time of the U< stage, expressed in seconds, at definite time mode of operation.k> The required setting range, 1...10 s, 10...100 s, is selected with switch SG1/6. At

IDMT mode of operation the setting range of the multiplier k< is 0.1...1.00

Settings The setting values are shown by the threerightmost green digits of the display. The LEDindicator below the setting knob shows, when

The checksum of the programming switch-group SG1 is indicated on the display when theindicator under the switchgroup is lit. In thisway a check can be made to prove that the

switches have been set and that they work prop-erly. An example of hoe the checksum is calcu-lated is given in the description "General char-acteristics of C-type relay modules".

of the module. The numbering of the switches,1...8, and the switch positions, 0 and 1, aremarked on the front panel.

Selector switches Additional relay functions required in variousapplications are selected with the selector switchesof switchgroup SG1 located on the front panel

Switch Functions to be selected

SG1/1 Start time for the overvoltage stage U>.SG1/2

SG1/1 SG1/2 Start time

0 0 0.1 s1 0 1 s0 1 10 s1 1 60 s

SG1/3 Definite time or inverse time operation characteristic for the U> stage. At definite timeSG1/4 characteristic switch SG1/4 is used for selecting the setting range of the operate time t>.

At inverse time operation switch SG1/4 is used for selecting the characteristic curve set.

SG1/3 SG1/4 Mode of operation Operate time t> orcharacteristic curve set

0 0 Definite time 0.05...1.00 s0 1 Definite time 0.5...10.0 s1 0 Inverse time Curve set A1 1 Inverse time Curve set B

SG1/5 Automatic blocking of starting and tripping of the undervoltage stage U<.

When SG1/5 = 0, the undervoltage stage operates once a measured voltage falls belowthe setting value.When SG1/5 = 1, starting and tripping of the undervoltage stage are blocked if themeasured voltage falls below 0.2 x Un.

This feature can be used for preventing unnecessary starts and trips during auto-reclose sequences.

7

Switch Functions to be selected

SG1/6 Definite time or inverse time operation characteristic for the U< stage. At definite timeSG1/7 characteristic switch SG1/6 is used for selecting the setting range of the operate time t<.

At inverse time operation switch SG1/6 is used for selecting the characteristic curve set.

SG1/6 SG1/7 Mode of operation Operate time t>or characteristic curve

0 0 Definite time 1...10 s1 0 Definite time 10...100 s0 1 Inverse time Curve set C1 1 Inverse time Curve set C

SG1/8 Start time selection for the undervoltage stage U<.

When SG1/8 = 0, the start time is 0.1 s.When SG1/8 = 1, the start time is 30 s.

Switchgroup SG2 is a so called software switch-goup, which is located in the third submenu ofchecksum register of switchgroup SG1. Themode of operation, i.e. self-reset or manuallyreset, of the LED indicators U> and U< isdetermined by the switches of switchgroup SG2.

The mode of operation can be separately set foreach indicator. The mode of operation is set bymeans of the checksum, which can be calculatedfrom the following table. Normally the startindications are self-reset and the operation indi-cations manually reset.

Indicator Manual reset mode Factory set User's settingsdefault value

Start indicator U> 1 0Operation indicator U> 2 2Start indicator U< 4 0Operation indicator U< 8 8

Checksum ∑ 15 10

Switchgroup SG3 is a so called software switch-group, which is located in the fourth submenuof switchgroup SG1. The front panel push-

buttons STEP and RESET can be programmedwith switch SG3/1. Switches SG3/2…8 are notin use. The default value for SG3 is 0.

SG3/1 Push-button Clear start/trip LED's Erase memorized values

STEP0 RESET x

STEP & RESET x x

STEP x1 RESET x

STEP & RESET x x

The PC board of the relay module contains aswitchgroup SGB with eight switches. Theswitches 1...3 are used for configuring the startsignals going from the module, whereas theswitches 5, 7 and 8 are used for configuring theblocking signals to be routed to the under-

voltage stage in different protection relays.Switches 4 and 6 have no function in the relaymodule SPCU 1C1. Instructions for configuringswitchgroup SGB are given in the user's manualof the different protection relays and in thesignal diagram of the user's manual.

8

Measured data The measured value is shown by the threerightmost green digits on the display. The data

currently being presented on the display areindicated by LED indicators on the front panel.

Indicator Measured quantity

U The voltage measured by the module, expressed as a multiple of the rated voltageof the relay energizing input.

Recordedinformation

The leftmost red digit displays the register ad-dress and the other three digits the recordedinformation.

Register/ Recorded informationSTEP

1 The highest voltage value measured during the start sequence as a multiple of therated voltage of the relay energizing input. Any overvoltage stage start erases the oldvalue and starts a new recording sequence. The recording sequence is stopped onoperation of the overvoltage stage and the highest value during the start sequence isfound in the register.

2 The highest voltage value measured as a multiple of the rated voltage of the relayenergizing input. The register value is updated as soon as the measured value exceedsthe value alredy in the register. Register 2 is erased with a command via the serial portor by pushing the STEP and RESET push-buttons simultaneously. The registeredvalue is also erased on loss of auxiliary supply.

3 The lowest voltage value measured during the start sequence as a multiple of the ratedvoltage of the relay energizing input. Any undervoltage stage start erases the old valueand starts a new recording sequence. The recording sequence is stopped on operationof the undervoltage stage and the lowest value during the start sequence is found inthe register.

4 The lowest voltage value measured as a multiple of the rated voltage of the relayenergizing input. The register value is updated as soon as the measured value fallsbelow the value already in the register. Register 4 is erased with a command via theserial port or by pushing the STEP and RESET push-buttons simultaneously. Theregistered value is also erased on loss of auxiliary supply.

5 Number of starts of the overvoltage stage, n (U>) = 0...255.

6 Number of starts of the undervoltage stage, n (U<) = 0...255.

7 Duration of the latest start event of the overvoltage stage, expressed as percentage ofthe set operate time t>, or, at IDMT mode of operation, of the calculated operatetime. A new start resets the counter which starts recounting from zero. If the stagehas tripped, the counter reading is 100.

8 Duration of the latest start event of the undervoltage stage, expressed as percentageof the set operate time t<, or, at IDMT mode of operation, of the calculated operatetime. A new start resets the counter which starts recounting from zero. If the stagehas tripped, the counter reading is 100.

9

Register/ Recorded informationSTEP

0 Display of blocking signals and other external control signals. The digit at theextreme right indicates the state of the blocking of the undervoltage stage.The following states are indicated:0 = no blockings2 = tripping of the undervoltage stage blocked

The middle digit of the register is always a zero. The leftmost green digit indicatesthe state of the remote reset input, if any.The following states are indicated:0 = remote reset control input not energized1 = remote reset control input energized

From this register it is possible to move to the TEST mode, where the start and tripsignals of the module can be activated one by one. For further details see thedescription "General characteristics of C type relay modules".

A Address code of the protection relay module, required by the serial communicationsystem.

Register A has three subregisters with the following contents:1) Selection of data transfer rate for the serial communication. Selectable values 300,

1200, 2400, 4800 or 9600 Bd. Default value 9600 Bd.2) Communication interruption counter. If the relay module is connected to a

communication system, which is in operation, the value of the communicationinterruption counter is 0 (zero). When disturbance occurs on the communicationsystem, the numbers 0…255 are scrolling in the communication interruptioncounter.

3) Password required for remote setting of relay module parameters.

When the display is dark the starting point ofthe display menu can be reached by pushing theSTEP push-button once.

The registers 1...8 are set to zero by pressing thepush-buttons STEP and RESET simultaneouslyor via the SPA bus with the command V102.The registers are also cleared if the auxiliarypower supply to the module is interrupted. Theaddress code of the relay module, the baud rate

of the serial communication and the passwordare not erased by a voltage failure. Instructionsfor setting the address and the baud rate aregiven in user's manual "General characteristicsof C type relay modules".

At the initial state when none of the stages hasstarted, the reading of register 1 is "000" andthat of register 3 is "– – –"

10

Registermenu chart

The figure below shows the menus and sub-menus of the combined overvoltage and under-voltage relay module SPCU 1C1.

Display off. Normal state

Voltage U measured

21

Remotely set value t< x p4 / k< x p4

21

Checksum of switchgroup SG1

Remotely setpercentage p4

1

Set start voltage U<

Set operate time t> or time multiplier k> of stage U>

SUBMENUSTEP FORWARD 1 sSTEP BACKWARD 0,5 s

MAI

N

MENU

STEP

BACKWARD

.5s

STEP

FORWARD

1s

MAIN MENU SUBMENU

STEP 0,5 s RESET 1 s

1

2

Set start voltage U>

2 Remotely setchecksum

1 Remotely setchecksum 3 Checksum of

switchgroup SG2

2

Remotely setvalue U< x p3

Remotely setvalue U> x p1




Max. voltage measured during the last start of U>1

Max. voltage measured after reset2

3

Remotely set value t> x p2 / k> x p2

Duration of the latest start event of stage U>

8

7

Incoming blocknings0

Relay module address code A

0 000

Data transfer rate (Bd)1

SS1 TS1 TS2IRF SS2

Bus communication monitor 0...2552 Password3

Duration of the latest start event of stage U<

= parameter that can be set in the setting mode

Set operate time t< or time multiplier k< of stage U<

Min. voltage measured after reset4

Number of starts of overvoltage stage5

6 Number of starts of undervoltage stage

Min. voltage measured during the last start of U<

3 Checksum of switchgroup SG3

The manual "General characteristics of C typerelay modules", describes how submenus andsetting modes are entered and escaped from and

how setting is carried out. Further the manualdescribes the TRIP-TEST mode of the relaymodule.

11

At inverse time characteristic the operate timewill be shorter the greater the deviation from thesetting value.

The operation of the U> stage is based on inversetime characteristic, when the selector switchSG1/3 on the front panel is in position 1. Atinverse time characteristic the relationship be-tween time and voltage can be expressed asfollows:

t = + c (b - 0.5)

where t = operate time [s]k> = time multiplierU = measured voltage [V]U> = set start voltage [V]a = constant 480b = constant 32c = constant 0.035p = constant

At an IDMT mode of operation the recordingof the operate time of the overvoltage stage doesnot start until the voltage exceeds the set startvalue by 6%. The operate time accuracy statedin the technical data applies when the voltageexceeds the set start value by 10%. The over-voltage stage includes two characteristic curveset. The characteristic curve set is selected withthe selector switch SG1/4.

The degree of inversity is determined by thefactor p as follows:

Characteristic p (constant)

A 2B 3

The operation of the U< stage is based on inversetime characteristic, when the selector switchSG1/7 on the front panel is in position 1. Atinverse time characteristic the relationship be-tween time and voltage can be expressed asfollows:

t = + c (b - 0.5)

where t = operate time [s]k< = time multiplierU = measured voltage [V]U< = set start voltage [V]a = constant 480b = constant 32c = constant 0.055p = constant 2

At an IDMT mode of operation the recording ofthe operate time of the undervoltage stage doesnot start until the voltage falls below the set startvalue by 6%. The operate time accuracy statedin the technical data applies when the voltagefalls below the set start value by 10%. Theundervoltage stage is provided with one charac-teristic curve set.

Voltage/timecharacteristic

k< aU< - U

U

0,05

0,2

0,4

0,71,0

k>

t / s

1,0

k> aU - U>

U>p

12

Fig. 5. Characteristic curve set B of the overvoltage stage U>

0,050,20,40,71,0

k>

U/U>1,51,41,31,21,11,00,01

0,1

1

1 0

100

1000

t / s

1,00,7

0,4

k<

0,2

0,1

U/U< 0,5 0,6 0,7 0,8 0,9 1,00,01

0,1

1

10

100

1000

t/s

Fig. 6. Characteristic curve set C of the undervoltage stage U<

13

Overvoltage stage U>Start voltage U> 0.8...1.6 x UnStart time, preset values 0.1, 1 s, 10 s or 60 sOperate time at definite time operationcharacteristic 0.05...1.00 s and 0.5...10.0 sTime multiplier k> at inverse time operationcharacteristic 0.05...1.0Reset time, typically 50 msDrop-off/pick-up ratio, typically 0.97Operate time accuracy at definite timecharacteristic and start time accuracy ±2 % of set value or ±25 msOperate time accuracy at inverse timecharacteristic ±25 ms or the inaccuracy appearing

when the measured voltage varies ±3%Operation accuracy ±3% of set value

Undervoltage stage U<Start voltage U< 0.4...1.2 x UnStart time, preset values 0.1 s or 30 sOperate time at definite time operationcharacteristic 1...10 s and 10...100 sTime multiplier k< at inverse time operationcharacteristic 0.1...1.0Reset time, typically 60 msDrop-off/pick-up ratio, typically 1.03Operate time accuracy at definite timecharacteristic and start time accuracy ±2% of set value or ±25 msOperate time accuracy at inverse timecharacteristic ±25 ms or the inaccuracy appearing

when the measured voltage varies ±3%Operation accuracy ±3% of set value

Technical data

14

Event codes The substation level control data communica-tor reads, over the SPA serial bus, the event dataof the relay module, e.g. start and trip events,from the overvoltage and undervoltage relaymodule SPCU 1C1. The events are printed outin the format: time (ss.sss) and event code. Theevent codes of the module are E1...E8 and E50and E51. Further, the substation level controldata communicator generates communicator-releted event codes.

The codes E1...E8 and the events represented bythese can be included in or excluded from theevent reporting by writing, over the SPA bus, aso called event mask (V155) to the module. Theevent mask is a binary number coded to adecimal number. The event codes E1...E8 are

represented by the numbers 1, 2, 4...128. Theevent mask is formed by multiplying abovenumbers either by 0 (event not included inreporting) or 1 (event included in reporting)and adding up the numbers received (comparecalculation of checksum).

The event mask may have a value in the range0...255. The default value of the overvoltage andundervoltage relay module SPCU 1C1 is 85,which means that all start and trip events areincluded in the reporting, but no resets. Theevents E50...E54 cannot be excluded from thereporting.

Event codes of the combined overvoltage andundervoltage relay module SPCU 1C1:

Event Event specification Weighting factor Factory setcode of event default value

E1 Starting of overvoltage stage U> 1 1E2 Starting of overvoltage stage U> reset 2 0E3 Operation of overvoltage stage U> 4 1E4 Operation of overvoltage stage U> reset 8 0E5 Starting of undervoltage stage U< 16 1E6 Starting of undervoltage stage U< reset 32 0E7 Operation of undervoltage stage U< 64 1E8 Operation of undervoltage stage U< reset 128 0E50 Restarting * -E51 Overflow of event register * -E52 Temporary disturbance in data communication * -E53 No response from the relay module via

the SPA bus * -E54 The relay module responds again over

the SPA bus * -

0 not included in event reporting1 included in event reporting* no code number- cannot be programmed

NOTE!In the SPACOM system the station level con-trol data communicator forms the event codesE52...E54.

15

Apart from the event codes the substation levelcommunication equipment reads, over the SPAbus, all input data (I data) and output data (Odata), setting values (S values), informationrecorded in the memory (V data), and someother data of the module. Further, part of the

data can be altered by commands given over theSPA bus. Any data are available on channel 0.

R = data that can be read from the moduleW = data that can be written to the module

Remote transferdata

Data Code Data Valuesdirect.

Measured voltage U I1 R 0...9.99 [x Un]Blocking of operation of undervoltage I2 R 0 = no blockingstage U< 1 = tripping of stage U< blocked

Starting of overvoltage stage U> O1 R 0 = U> stage has not started1 = U> stage has started

Operation of overvoltage stage U> O2 R 0 = U> stage has not operated1 = U> stage has operated

Starting of undervoltage stage U< O3 R 0 = U< stage has not started1 = U< stage has started

Operation of undervoltage stage U< O4 R 0 = U< stage has not operated1 = U< stage has operated

Alerted start voltage of stage U> S1 R 0.8...1.6 [x Un]Alerted operate time t> or S2 R 0.05...10 [s] ortime multiplier k> of stage U> 0.05...1.00Alerted start voltage of stage U< S3 R 0.4...1.2 [x Un]Alerted operate time t< or S4 R 1...100 [s] ortime multiplier k< of stage U< 0.1…1.0Alerted checksum of switchgroup SG1 S5 R 0...255

Start voltage of stage U>, S11 R 0.8...1.6 [x Un]set with the setting knobOperate time t> or time multiplier k> of S12 R 0.05...10 [s]stage U>, set with the setting knob 0.05...1.00Start voltage of stage U<, S13 R 0.4...1.2 [x Un]set with the setting knobOperate time t< or time multiplier k< of S14 R 1...100 [s] orstage U<, set with the setting knob 0.1…1.0Checksum of switchgroup SG1 S15 R 0...255(set with the switches)

Remote setting percentage of the S21 R, W 0...999%start voltage of stage U>Remote setting percentage of operate S22 R, W 0...999%time t> or time multiplier k> of stage U>Remote setting percentage of the S23 R, W 0...999%start voltage of stage U<Remote setting percentage of operate S24 R, W 0...999%time t< or time multiplier k< of stage U<Remotely set checksum of S25 R, W 0...255switchgroup SG1

Remotely set start voltage of stage U> S31 R 0.8...1.6 [x Un]Remotely set operate time t> or time S32 R 0.05...10 [s] ormultiplier k> of stage U> 0.05...1.00Remotely set start voltage of stage U< S33 R 0.4...1.2 [x Un]Remotely set operate time t< or time S34 R 1...100 [s] ormultiplier k< of stage U< R 0.1…1.0Remotely set checksum of S35 R 0...255switchgroup SG1

16


Max. voltage measured at starting V1 R 0...9.99 [x Un]of stage U>Max. voltage measured after last reset V2 R 0...9.99 [x Un]Min. voltage measured at starting V3 R 0...9.99 [x Un]of stage U<Min. voltage measured after last reset V4 R 0...9.99 [x Un]Number of starts of overvoltage stage V5 R 0...255Number of starts of undervoltage stage V6 R 0...255Duration of the latest start event of V7 R 0...100%stage U>Duration of the latest start event of V8 R 0...100%stage U<

Resetting of output relays and V101 W 1 = output relays and operationoperation indicators indicators resetSimultaneous resetting of output relays V102 W 1 = output relays and operationand operation indicators and erasing of indicators reset and regis-recorded data ters erased (codes V1…V8)

Remote control of settings V150 R, W 0 = setting with knobsS11...S15 alerted

1 = remote settingsS31...S35 alerted

Event mask word V155 R, W 0...255, see section"Event codes"

Self-reset or manual reset mode of V156 R, W 0…15, see sectionoperation for LED indicators (SG2) "Selector switches"Programming push-buttons (SG3) V157 R, W 0…1, see section

"Selector switches"

Opening of password required for V160 W 1...999remote settingChanging or closing of password V161 W 0...999for remote setting

Activation of self-supervision system V165 W 1 = self-supervision output isactivated and IRF indicatorlit in about 5 seconds,whereafter the self-super-vision system resets and theIRF indicator is switched off

Fault code generated by the self- V169 R 0…255supervision system

Data communication address V200 W 1...254of the module

Program version of the relay module V205 R e.g. 066A

17


Type designation of the relay module F R SPCU 1C1

Reading of event register L R Time, channel number andevent code

Re-reading of event register B R Time, channel number andevent code

Reading of module state data C R 0 = normal status1 = module has been subject

to automatic resetting2 = overflow of event register3 = events 1 and 2 together

Resetting of relay module status data C W 0 = resetting

Reading and setting of clock time T R, W 00.000...59.999 [s]

The data transfer codes L, B, C and T have beenreserved for the event data transfer between themodule and the station level control data com-municator.

The event register can be read by the L com-mand once only. Should a fault occur e.g. in thedata transfer, it is possible, by using the Bcommand, to re-read the contents of the eventregister read by means of the L command. Whenrequired, the B command can be repeated.

The setting values S1...S5 are the setting valuesused by the protection programs. These valuesare set either remotely or by means of the settingknobs. The values S11...S15 are settings set withsetting knobs or switches. S21...S25 are knobsetting percentage factors to be set remotely.The settings S21...S25 allow reading or writing.

A condition for writing is that the password,V160, for remote setting has been opened andthe potentiometer settings must be valid,V150=0. The variables S31...S35 contain theremote setting values.

When changing the remote setting percentagesS21...S24, these variables can be given a per-centage factor within the range 0...999. Then itis also possible to alter the setting value beyondthe setting ranges specified in the technical dataof the module. However, the validity of thesetting values is guaranteed only within thesetting ranges specified in the technical data.

Activation of the self-supervision input (V165)prevents the protection from operating as longas the self-supervision input is activated and theIRF indicator is on.

18

Fault codes Shortly after the self-supervision system hasdetected a permanent internal fault the red IRFindicator is lit. Simultaneously the relay moduleputs forward a control signal to the output relayof the self-supervision system. In most faultsituations an autodiagnostic fault code appearson the display of the module. The fault codeconsists of a red figure 1 (one), and a green, one,

two or three digit code number. When a fault isdetected the fault code should be recorded andstated when the relay module is to be repaired.

Some of the fault codes that may appear on thedisplay of the combined overvoltage and under-voltage relay module SPCU 1C1 are shown inthe following list:

Fault code Type of fault

4 Output relay control circuit interrupted or output relay module missing30 Faulty Read Only Memory (ROM)50 Faulty Random Access Memory (RAM)

195 Too low a value on reference channel with multiplier 1131 Too low a value on reference channel with multiplier 567 Too low a value on reference channel with multiplier 25

203 Too high a value on reference channel with multiplier 1139 Too high a value on reference channel with multiplier 575 Too high a value on reference channel with multiplier 25

253 No interruptions from the A/D converter

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

Indicators for measured values

Setting knob 1with indicator

Stage 1



Stage 2


Self-supervision alarm indicator(Internal Relay Fault)

Display, 1 + 3 digits

Step push-button (STEP)

Programming switches SG1

Switchgroup indicator

Reset push-button (RESET)

Start/operation indicators

General characteristics ofC-type relay modules


2

General characteristics ofC-type relay modules

Contents Push-buttons .................................................................................................................. 2Programming switches SG1 ............................................................................................ 2Setting knobs .................................................................................................................. 3Display ........................................................................................................................... 3

Display main menu ................................................................................................... 3Display submenu ....................................................................................................... 4Setting mode ............................................................................................................. 4Example: Operation in setting mode ......................................................................... 5Stored information .................................................................................................... 6Trip-test mode........................................................................................................... 7Example: Trip-test function ...................................................................................... 8

Operation indicators ....................................................................................................... 9Fault codes ...................................................................................................................... 9

Push-buttons The front panel of the relay module containstwo push-buttons. The STEP button is used forstepping forward in the display and the RESETbutton for resetting the red indicators. Addi-tionally, the push-buttons are used for certain

settings, e.g. for setting the address of the relaymodule and the data transfer rate for the serialcommunication when the modules are used inrelay packages provided with this quality. (Seesection Display).

Programmingswitches SG1

Part of the settings and the selections of theoperating characteristics for the relay modulesin various applications are made with the pro-gramming switches SG1 on the front panel. Theindicator of the switchgroup glows when the

checksum of the switchgroup is shown on thedisplay. The checksum can be used for checkingthat the switches are properly set. Fig. 2 gives anexample of calculating the checksum.

Fig. 2. Example of calculating the checksum of programming switchgroup SG1.

When the checksum calculated according to theexample is equal to the checksum indicated onthe display of the relay module, the switches areproperly set.

The function of the programming switches ofthe individual measuring relay modules is speci-fied in the description of the module concerned.

1MRS 750328-MUM EN

Issued 96-02-19Version A (replaces 34 SPC 2 EN1)Checked L-W UApproved TK


3

Setting knobs Most of the operating values and operatingtimes are set by means of the setting knobs onthe front panel of the relay module. Each settingknob has its own (LED) indicator which glowswhen the concerned setting value is shown onthe display.

If a setting knob is turned while the display isshowing another measured or set value, thevalue being set automatically appears on thedisplay. Simultaneously, the indicator for theconcerned setting starts glowing.

In addition to the settings made with the settingknobs, most modules allow so called remotesetting. This means that the settings made bymeans of the setting knobs of the module andthe checksum of the programming switchgroupmay be altered through an instruction over theserial communication bus. Remote setting ispossible if the password in the register A isknown, and the remote settings are not acti-vated, i.e. parameter V150=0. The circumstancethat the remote settings are activated is shownwith a flashing light of the indicator of thesetting knob, the value of which currently isbeing displayed.

Display The measured and set values as well as the datarecorded are shown on the display of the meas-uring relay module. The display consists of fourdigits. The three digits (green) to the rightindicate the measured, set or stored value andthe digit at the extreme left (red) the number ofthe register. The measured or set value displayedis indicated by a yellow LED indicator. Thenumber of the register glows only when a storedvalue is displayed.

When the auxiliary voltage is connected to ameasuring relay module, the module initiallytests the display by stepping through the digits1...9 for about 15 seconds. When the test isfinished the display turns dark. The testing canbe interrupted by pressing the STEP button.The protective functions of the module areoperative throughout the testing.

Display main menu All the data required during normal operatingconditions are accessible from the main menuwhich presents the measured values in real-time,the normal setting knob settings as well as themost important memorized data.

The data to be shown in the main menu areselected to the display in a certain sequence bymeans of the STEP button. When pressing theSTEP button for about one second, the displaymoves forward in the display sequence. Whenpressing it for about 0.5 seconds, the displaymoves backwards in the display sequence.

From a dark display only forward movement ispossible. When keeping the STEP button de-pressed, the display is continuously moving inforward direction stopping for a while at thedark point.

Unless the display is switched off by stepping tothe dark point, it remains activated for about 5minutes from the last pressing of the STEPbutton and then goes out.

4

Display submenu Less important values and values not very oftenset are displayed in the submenus. The numberof submenus varies with different relay moduletypes. The submenus are presented in the de-scription of the concerned module.

A submenu is entered from the main menu bypressing the RESET button for about one sec-ond. When the button thereafter is released, thered digit (STEP) of the display starts flashing,indicating that one is in a submenu. Going fromone submenu to another or back to the mainmenu follows the same principle as when mov-ing from the main menu display to another; the

display moves forward when pressing the STEPbutton for one second and backward whenpressing it for 0.5 seconds. The return to themain menu has taken place when the red STEPdisplay turns dark.

When entering a submenu from a measured orset value indicated by a LED indicator, theindicator remains glowing and the address win-dow (STEP) of the display starts flashing. Aflashing address window when no LED indica-tor is lit indicates that the submenu of a registerhas been entered.

Fig. 3. Example of the main and submenus for the settings of the overcurrent relay module SPCJ3C3. The settings made with the setting knobs are in the main menu and they are displayed bypressing the STEP button. In addition to the setting knob settings the main menu contains themeasured current values as well as the registers 1…5, as well as 0 and A. The remote settingpercentage and remote setting value are located in the submenus for the settings and are activatedon the display by pressing the RESET button.

Setting mode The registers of the main menu and the submenusalso contain parameters to be set. The settingsare made in the so called setting mode, which isaccessible from the main menu or a submenu bypressing the RESET button, until the digit atthe extreme right starts flashing (about 10 s).The flashing digit is set by means of the STEPbutton. The flashing is moved on from digit todigit by pressing the RESET button.

A set value is stored in the memory by pressingthe push-buttons STEP and RESET simultane-ously. In practice the RESET button must be

pressed slightly in excess of the STEP button.Return from the setting mode to the main menuor submenu is possible by pressing (for about 10s) the RESET button until the green digits onthe display stop flashing. If the module is left inthe setting mode, it will return automatically tothe start condition after about 5 minutes.

The values to be set in the setting mode are forinstance the address code of the relay moduleand the data transfer rate for the serial commu-nication. Further the percentage values for theremote settings can be changed.

5

Example 1: Function in the setting mode. Manual setting ofthe address code of a relay module and the datatransfer rate for the serial communication. Theinitial value for the address code is 146.

a)Press push-button STEP until register address Aappears on the display.

b)Press the RESET button for about 10 s until theright most digit starts flashing.

c)Press the STEP button repeatedly to set the digitto the value desired.

d)Press the RESET button to make the middle ofthe green digits flash.

e)Set the middle address digit by means of theSTEP button.

f)Press the RESET button to make the left mostgreen digit flash.

g)Set the digit by means of the STEP button.

h)Store the set address number in the memory ofthe relay module by pressing the RESET andSTEP button simultaneously. At the momentthe information enters the memory, the threegreen dashes flash in the display, i.e. A—.

i)Leave the setting mode by pressing the RESETbutton for about 10 s, until the display stopsflashing.

j)Then enter submenu 1 of register A by pressingthe RESET button for approx. one second. Theregister address A is then replaced by a flashing1. This submenu is used for setting the datatransfer rate of the serial communication.

k)The data transfer rate for the serial communica-tion is set and stored in the same way as theaddress, see sections b...i, except that the con-tinuously glowing register address has been re-placed by a flashing 1.

l)After storing the data transfer rate for the serialcommunication you may return to the mainmenu of register A by pressing the STEP buttonfor about 0.5 second.

6

Stored information The parameter values measured at the momentwhen a fault occurs are recorded in the registers,in some modules also the setting values. Therecorded data, except for some setting param-eters, are set to zero by pressing the push-buttons STEP and RESET simul-taneously.The data in normal registers are erased if theauxiliary voltage supply to the relay is disrupted,only the set values and the number ofautoreclosings are maintained in the registers ata voltage failure.

The number of the registers varies with differentmodule types. The function of the registers areillustrated in the descriptions of the separaterelay modules. Additionally, the system panelcontains a simplified list of the data recorded bythe various relay modules of the relay assembly.

All C-type relay modules are provided with twogeneral registers: register 0 and register A.

Register 0 contains, in coded form, the informa-tion about e.g. external blocking signals andstatus information for the circuit breaker. Thecodes are explained in the descriptions of therelay modules.

Register A contains the address code of the relaymodule as required by the serial communicationsystem. Example 1 on page 4 shows how theaddress code is altered. Submenu 1 of register Acontains the data transfer rate value expressed inkilobaud for the serial communication.

Submenu 2 of register A contains a bus trafficmonitor for the SPACOM system. If the protec-tive relay, which contains the relay module, islinked to a system including the control datacommunicator and the data communicationsystem is operating, the counter reading of themonitor will be zero. Otherwise the digits 1...255are continuously rolling in the monitor.

Submenu 3 contains the password required forchanging the remote settings. The address code,the data transfer rate for the serial communica-tion and the password can be set manually or viathe serial communication bus. For manual set-ting see example 1.

The start value for the address code and thepassword is 001 and that for the data transferrate 9.6 kilobaud.

7

Trip-test mode Register 0 also allows access to the so calledTrip-test function, which allows the outputsignals of the relay module to be activated one byone. If the auxiliary relay module of the protec-tion assembly is in place, the auxiliary relays willbe included in the testing.

When pressing the RESET button for about 10seconds, the three green digits to the right startflashing to indicate that the relay module is intest position. The indicators of the setting knobsindicate by flashing which output signal can beactivated. The required output function is se-lected by pressing the RESET button for about1 second, until the following LED indicatorstarts flashing.

The indicators of the setting knobs refer to thefollowing output signals:Setting knob 1 SS1 Starting of stage 1Setting knob 2 TS1 Tripping of stage 1Setting knob 3 SS2 Starting of stage 2Setting knob 4 TS2 Tripping of stage 2No indication IRF Self-supervision

The selected starting or tripping is activated bysimultaneous pressing of the push-buttons STEPand RESET. The signal remains activated aslong as the two push-buttons are being pressed.

The self-supervision output is activated by press-ing the STEP button once when no setting knobindicator is flashing. The IRF output is acti-vated in about 5 seconds after pressing of theSTEP button, and resets after that. Simultane-ously, the display returns to the main menu andperforms the initial testing indicated by rollingdigits 0...9 in the display several times.

The signals are selected in the order illustrated infig. 4.

REGISTER 0IRF SS1 TS1 SS2 TS2

STEP STEP+RESET

STEP+RESET

STEP+RESET

STEP+RESET

RESET10 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

Fig. 4. Sequence order for selecting the output signals in the Trip-test mode.

If e.g. the indicator of the setting knob 2 (secondfrom the top) is flashing, and the push-buttonsSTEP and RESET are being pressed, the signalTS1 (tripping of stage 1) is activated. Return tothe main menu is possible at any stage of the

Trip-test sequence scheme, by pressing theRESET button for about 10 seconds. If themodule is left in the Trip-test mode, it willreturn automatically after approx. 5 minutes.

8

Example 2: Trip-test function. Forced activation of the out-puts is made as follows:

a)Step forward on the display to register 0.

b)Press the RESET button for about 10 secondsuntil the three green digits to the right and theLED indicator of the uppermost setting knobstart flashing.

c)Press the push-buttons RESET and STEP si-multaneously. Then the starting of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3) is activated and, simultaneously, the indi-cator of the stage starts glowing yellow.

d)Press the RESET button for about 1 seconduntil the indicator of the second setting knobstarts flashing.

e)Press the push-buttons RESET and STEP si-multaneously to activate tripping of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3). The indicator of the concerned stagestarts glowing red.

f)Starting and tripping of the second stage isactivated in the same way as stage 1. The indica-tor of the third or fourth setting starts flashing toindicate that the concerned stage has been acti-vated.

g)To activate the self-supervision output step to-wards the test position, where no indicator isflashing. Press the STEP button once. In about5 seconds the red IRF indicator starts glowingand the IRF output is activated. Shortly thereaf-ter the indicator goes out and the output auto-matically resets. At the same time the moduleleaves the test position.

h)It is possible to leave the trip test mode at anystep of the sequence scheme by pressing theRESET button for about 10 seconds until thethree digits to the right stop flashing.

9

Operationindicators

A measuring relay module is provided with twoseparate operating stages, each of which with itsown yellow/red operation indicator on the lowerpart of the front plate of the relay module.

The operation indicator starts glowing yellowwhen the operating stage starts and red when adelayed tripping operates. The functions of thestart and operation indicators are described indetail in the different protection relay modulemanuals.

Fault codes In addition to the protective functions the relaymodule is provided with a self-supervision sys-tem which continuously supervises the functionof the microprocessor, its program executionand the electronics.

When the self-supervision system has detected apermanent fault in the relay module, the redIRF indicator on the panel starts glowing soonafter the fault was discovered. At the same timethe module puts forward a signal to the self-supervision contact of the relay assembly.

In most fault situations a fault code, indicatingthe nature of the fault, appears on the display ofthe module. The fault code, which consists of ared digit (1) and a three digit green code number,cannot be removed from the display by reset-ting. When a fault occurs, the fault code shouldbe recorded and stated when service is ordered.

1MR

S 7

5060

8-M

UM

E

N

ABB OySubstation AutomationP.O.Box 699FIN-65101 VAASAFinlandTel. +358 (0)10 22 11Fax.+358 (0)10 22 41094www.abb.com/substationautomation

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