pecon condense catalogue 2013

yearsA N N I V E R S A R Y

1 9 7 3 - 2 0 1 3

40

ISO 9001:2008 Certified

Power Electronics & Control

Condensed Catalogue

Jan 2013

MA - 116Power Electronics & Control

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5 6 7 8

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Reset F/OReset Test Power

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Power Electronics & Control, better known by it’s brand name PECON, has been associated withElectrical & Power Industry, since 1973. Starting a small way, it has covered a long way becoming oneof the most trusted name in transformer protection and temperature surveillance system. PECON is aclose knit company with well qualified & trained manpower.

PECON is pioneer in electronic type OTI / WTIs, for both Oil cooled and Dry type transformers. With over 50,000 installations in the field, PECON is surely the leader in India in this field. OEM list includes almost all majors in transformer industries in INDIA. Our products are also exported to European & U.S. markets.

PECON is committed to technical excellence and complete customer satisfaction.

Associate Company

Via L. da Vinci 54/56 - 20094Corsico (MI) - ITALY

Electronic type temperature survillience systems and

ventillations fans for transformers.

882/2, G.I.D.C Estate,Makarpura, Vadodara : 390 010

Instrumentation Panels,Turnkey instrumentation jobs,

PLC/DAS based Control Panels.

Group Company

Positronics (Pvt) Ltd

INDEX

7 Channel WTS with dual 4-20mA

7 Channel WTS with 4-20mA & RS-485

Single channel WTS with 4-20mA

Single channel WTS with RS-485

1

2

3

4

5

4 Channel WTS with 4-20mA

4 Channel WTS with RS-485

4 Channel WTS with 4-20mA inputs





6 Channel WTS with Profibus-DP





TR-7543

TR-7543-C

TR-7577-Rx

TR-7577-CX

TR-7544

TR-7544-C

TR-7544-SP

TR-7576

TR-7576-C

TR-7576-Rx

TR-7576-Cx

TR-7576-CP

TR-7570

TR-7570-C

TR-7570-RX

TR-7570-CX

FO

R D

RY

TY

PE

/ C

AS

T R

ES

IN T

RA

NS

FO

RM

ER

S

i

ii

TR-8080 spl+

SPT-04

4 Channel split type WTS

with 4-20mA & RS-485

TR-7560 3 Channel WTS with 4-20mA & 0-1mA

TR-7541-M

TR-7541-C

6

7

8

9

10

11

TR-7578

TR-7578-C



Single channel WTI with 4-20mA

Single channel WTI with RS-485

S-02 Sensor Pt-100

JB-01 Junction Box (for 4 S-02 sensors)FO

R D

RY

TY

PE

/ C

AS

T R

ES

IN T

RA

NS

FO

RM

ER

S

TR-8080-FO+

FOXTR-02+

SFO-01

3 Channel WTSFor HT & EHT Transformer Windings

With Fiber Optics Temperature Transmitter,Fiber Optic Sensors &

4-20mA & RS-485 outputs.

TPR-05 Thermistor Relay 12

iii

14

15

13

16

Remote Winding Temperature Indicatorwith 4-20mA input.

Remote Winding Temperature Indicatorwith RS-485 from PECON OIT & WTI

RWTI-500M

RWTI-500C

S-07M

S-07F

LR-01

RTD sensor for OTI & WTIwith female BSP threads

RTD sensor for OTI & WTIwith male BSP threads

Latch Relay

17

RWTI-400M

RWTI-400C

Remote Winding Temperature indicatorwith 4-20mA input

Remote Winding Temperature indicatorwith RS-485 from PECON WTS

OTI & WTI with 4-20mA

OTI & WTI with 4-20mA & RS-485

OTI & WTI with 4-20mA & RS-485

OTI & WTI with 4-20mA

TR-7551

TR-7551-C

TR-7552

TR-7552-C

FO

R O

IL C

OO

LE

D T

RA

NS

FO

RM

ER

SF

OR

D

RY

/ C

RT

S

TRM-08 Relay Module

ROM-01Remote Output Module

with 3 isolated 4-20mA outputs

4 Channel WTS for CRT

4 Channel WTS for CRT

OTI & WTI for oil cooled transformers

Transformer Cooling Fan

Application note & FAQs

22

23

24

NT-133 IT

TTG-240

NT-935

T-154

TE

CS

YS

TE

M P

RO

DU

CT

S

MA-116

MA-112

MA-108

MA-106

16 Channel Window Annunciator




Dimension & Mounting DetailsFigure 2 to 6

18

2090

96

96

10 125

Front View Side View

MA - 116Power Electronics & Control

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Reset F/OReset Test Power

AcceptAcceptReset F/O

Reset

UT-101

UT-102

Temperature / Process Scanner

Temperature Scanner

CO

NT

RO

L R

OO

MD

IME

NS

ION

NO

TE

S

19

iv

Transformer Protection Relay

TR-7570

Note : For dimension & mounting details, please refer Figure - 2 on Page 20.

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TR-7570

Salient features :

Four channel temperature scanner.

Temperature indication range : – 50 to 300 °C.

Four relay outputs for Fault, Fan, High (Alarm) &Very High (Trip).

Independent set of setpoints for 4th Channel.

4-20mA / RS-485 output for remote temperature indication / DAS / SCADA application (view options).

Aux. Supply : 85-270 VAC/DC (Optionally 20-50 VAC/DC).

Output Signals TR-7570 TR-7570-C TR-7570-Rx TR-7570-Cx

Remote output – 1 (4-20mA)

YES NO YES YES


NO NO YES NO

RS-485 (MODBUS protocol)

NO YES NO YES

Fault FanHigh Very HighRTD 1 RTD 2 RTD 3 RTD 4 Remoteo/p

+

-

NC

1513 14 1716 1819 20212223241 2 3 4 5 6 7 8 9 10 11 12 2526 2829 30

Aux Supply85 - 270 VAC/DC

Fault FanHigh Very HighRTD 1 RTD 2 RTD 3 RTD 4

NC

Aux Supply85 - 270 VAC/DCBA

RS-485

13 1415 16171819 20212223241 2 3 4 5 6 7 8 9 10 11 12 2829 302526

TR-7570

TR-7570-C

Inputs

Inputs

Input

Input

Outputs

Outputs

BARS-485

Remoteo/p

-

+

Fault

Fault

Fan

Fan

High

High

Very High

Very High

RTD 1

RTD 1

RTD 2

RTD 2

RTD 3

RTD 3

RTD 4

RTD 4

NC

3940 414213 1415 16171819 20212223241 2 3 4 5 6 7 8 9 10 11 12 2829 30



TR-7570-Cx

Inputs

Inputs Input

InputOutputs

Outputs

Remote o/p

1 2

+ +

- -TR-7570-Rx

NC

39 4140 4213 1415 16171819 20212223241 2 3 4 5 6 7 8 9 10 11 12 2829 30

Terminal details :

1

Options :

TR-7576

Salient features :

Six channel temperature scanner.


Fan exerciser function.

Test Function to simulate operation of WTS.

Independent set of setpoints for 6th Channel. 4 Relay o/ps for Fault, Fan, High (Alarm) & Very High (Trip).

4-20mA / RS-485 / Profibus output for remote temperature indication / DAS / SCADA application (refer options).


Transformer Protection RelayTR-7576


Output Signals TR-7576 TR-7576-C TR-7576-Rx TR-7576-Cx TR-7576-CP


YES NO YES YES NO


NO NO YES NO NO


NO YES NO YES NO

Profibus- DP protocol NO NO NO NO YES

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ProfibusDP

GBA

414243

Aux. Supply85-270

VAC-DC

1 2 3 4 5 6 7 8 9 10 11 121314151617183940 2321 2422 252627282930 31

Remoteo/pRTD 1 HighFault V.High FanRTD 2 RTD 3 RTD 4 RTD 5 RTD 6

RS-485BA

4142

++

--

414243

RS-485GBA

1 2 3 4 5 6 7 8 9 10 11 121314151617181920 21222324252627282930 31

+

Aux. Supply85-270

VAC-DC-

Fault High V.High FanRemote

o/pRTD 1 RTD 2 RTD 3 RTD 4 RTD 5 RTD 6

1

1

1

2

2

2

3

3

3

4

4

4

5

5

5

6

6

6

7

7

7

8

8

8

9

9

9

10

10

10

11

11

11

12

12

12

13

13

13

14

14

14

15

15

15

16

16

16

17

17

17

18

18

18

21

21

22

22

23

2321

23

24

2422

24

25

25

25

26

26

26

27

27

27

28

28

28

29

29

29

30

30

30

31

31

31

Aux. Supply85-270

VAC-DC

Aux. Supply85-270

VAC-DC

Aux. Supply85-270

VAC-DC

Fault

Fault

High

HighFault

High

V.High

V.High

V.High

Fan

Fan

Fan

RTD 1

RTD 1

RTD 1

RTD 2

RTD 2

RTD 2

RTD 3

RTD 3

RTD 3

RTD 4

RTD 4

RTD 4

RTD 5

RTD 5

RTD 5

RTD 6

RTD 6

RTD 6

TR-7576

TR-7576-C

TR-7576-Rx

TR-7576-CP

TR-7576-Cx

Inputs

Inputs

Inputs

Inputs

Inputs

Outputs

Outputs

Outputs

Outputs

Outputs

Input

Input

Input

Input

Input

Remote o/p

1 2

+ +

- -

39 4140 42

Terminal details :

2

Options :


Salient features :

Seven channel temperature scanner.


Fan exerciser function.

Test Function to simulate operation of WTS.

Three relay outputs for High (Alarm), Very High (Trip) and Fault / Fan (configure either as Fan or Fault relay at site).

Independent set of setpoints for 7th Channel.

4-20 mA / RS-485 output for remote temperature indication and / or DAS / SCADA application (refer options).

Aux. Supply: 85-270 VAC/DC (Optionally 20-50 VAC/DC).

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TR-7577-Rx

Output Signals TR-7577-Rx TR-7577-Cx


YES YES


YES NO


NO YES

Terminal details :

Remote o/p Aux. Supply85-270

VAC-DC

RTD 1 High V.High FanFLT/

1 2 3 4 5 6 7 8 9 10 11 1213141516 1917 2018 2139 4140 42 23242526272830 31

RTD 2 RTD 3 RTD 4 RTD 5 RTD 6 RTD 71 2

+ +

- -

Aux. Supply85-270

VAC-DC

RTD 1 High V.High FanFLT/RTD 2 RTD 3 RTD 4 RTD 5 RTD 6 RTD 7

BA

RS-485

Remoteo/p

1 2 3 4 5 6 7 8 9 10 11 1213141516 1917 2018 21 23242526272830 3139 4140 42

+

-

TR-7577-Rx

TR-7577-Cx

Inputs

Inputs

Outputs

Outputs

Input

Input

TR-7577-Rx / TR-7577-Cx


3

Options :


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Salient features :

Single channel temperature indicator.

Temperature indication range : -20 to 250 °C.

Test function to simulate operation of WTI.

4 Relay outputs for Fault, Fan, Alarm & Trip.

Fan relay is rated for 10A @ 230VAC.

4-20mA / RS-485 output for remote temperature indication and / or DAS / SCADA application (refer options).

Enclosure : Noryl (Fire retardant material).



TR-7543

Terminal details :

RTD

RTD

5

5

6

6

Fault

Fault

7

7

8

8

9

9

Fan

Fan

10

10

11

11

12

12

Alarm

Alarm

13

13

14

14

15

15

16

16

Trip

Trip

17

17

18

18

19

19

Aux. Supply85-270

VAC-DC

Aux. Supply85-270

VAC-DC

N

N

L

L

E

E

1

1

2

2

3

3

Remoteo/p

2829

+

-

B GA

RS-485

3031 32

TR-7543

TR-7543-C

Outputs

Outputs

Input

Input

Input

Input

Input

Input

Output

Output

Output Signals TR-7543 TR-7543-C

Remote output (4-20mA)

YES NO


NO YES

TR-7543

4

Options :


TR-7544

Salient features :



Test function to simulate operation of WTS.

Four relay outputs for Fault, Fan, Alarm & Trip.

Fan relay is rated for 10A @ 230VAC.




TR-7544


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5

Signals TR-7544 TR-7544-C TR-7544-SP

Input signal RTD, Pt-100 RTD, Pt-100 4-20mA

Remote output signal (4-20mA)

YES NO YES


NO YES NO

RTD 1

4 5 6

Fault

7 8 9

Fan

10 11 12

Alarm

131415

Trip

16 171819 20 2122 2324 25 26 27

RTD 2 RTD 3 RTD 4Aux. Supply85-270

VAC-DC

NLE

1 2 3

Remoteo/p

2829

+

-TR-7544

OutputsInputInput Inputs Output

B GA

RS-485

303132

RTD 1

4 5 6

Fault

7 8 9

Fan

10 11 12

Alarm

131415

Trip

16 171819 20 2122 2324 25 26 27

RTD 2 RTD 3 RTD 4Aux. Supply85-270

VAC-DC

NLE

1 2 3

TR-7544-C

OutputsInputInput Inputs Output

4 5 6

Fault

7 8 9

Fan

1410 12

Alarm

131415

TripAux. Supply85-270

VAC-DC

NLE

1 2 3

TR-7544-SP

OutputsInputInput 4-20mA Inputs Output

Remoteo/p

2829

+

-

CH # 1 CH # 2 CH # 3 CH # 4

NC NC NC NC

16 19 22 2517 20 23 2618 21 24 27

+ + + +

Options :

Terminal details :



TR-7541-M

TR-7541-M

Salient features :

Single channel temperature scanner.


Two relay outputs for Alarm & Trip.


Enclosure : Weatherproof Aluminum die cast (IP-65), with polycarbonate viewing window.


Output Signals TR-7541-M TR-7541-C


YES YES


NO YES

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TR-7541-M

TR-7541-M

TripAlarm

86 971 2 3 4 5 414243

RTD

Output Outputs InputInput

Remoteo/p

+

-

NC

10 11 12


414243

A B G

RS-485

Terminalsnot

provided

TR-7541-C

TripAlarm

86 971 2 3 4 5

RTD

Output Outputs InputInputInput Output

Remoteo/p

+

-

NC

10 1112


Terminal details :

6

Options :



TR-7578

TR-7578

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Salient features :

Eight channel temperature scanner.



4-20mA / RS-485 output for remote temperature indication / DAS / SCADA application (refer options).


Output Signals TR-7578 TR-7578-C


YES YES


NO YES

RTD 1

RTD 1

RTD 2

RTD 2

RTD 3

RTD 3

RTD 4

RTD 4

RTD 5

RTD 5

RTD 6

RTD 6

RTD 7

RTD 7

RTD 8

RTD 8

1

1

4

4

7

7

10

10

13

13

16

16

19

19

22

22

2

2

5

5

8

8

11

11

14

14

17

17

20

20

23

23

3

3

6

6

9

9

12

12

15

15

18

18

21

21

24

24

B GA

RS-485

717273

Aux. Supply85-270

VAC-DC

NC

Remoteo/p

+

-

Fan FaultAlarm

2829 302526 31 3233 34353637 3839404142

Trip

Aux. Supply85-270

VAC-DC

NC

2829 30

Remoteo/p

2526

+

-

31 3233

Fan

343536

Fault

37 3839

Alarm

404142

Trip

TR-7578

TR-7578-C

Inputs

Inputs

Outputs

Outputs

Input

Input

Output

Output

7

Options :

Terminal details :

Note : For dimension & mounting details of TR-8080 spt, please refer Figure - 2 on Page 20. For dimension & mounting details of SPT-04, please refer Figure - 5 on Page 21.

Transformer Protection System (Spilt Type)TR-8080 spt + SPT-04

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Salient features :

Split type architecture, simplifies the wiring.

Ease in case of replacement of RTD / RTD Module or Main scanner unit.



SPT-04 is designed for four S-02 inputs. Models with more i/p channels are also available.

PECON proprietary “Data Bus” for communication between TR-8080 spt & SPT-04.

4-20mA / RS-485 output for remote temperature indication / DAS / SCADA application.

Enclosures :(A) TR-8080 spt : Weatherproof Aluminum die cast (IP-65).(B) SPT-04 : 35 mm. Din Rail mount, Base - Polyamide.


Schematic Diagram :

Terminal details :

72 7374

Fault

757677

Fan

NCNC

78 7980

Alarm

81828384858687

Trip

RS-485

GBA

P+ P- D+ D-

61 626364 65 6667 6869 70 71

Remote o/p

+

-

Aux Supply85 - 270 VAC/DCTR-8080 spt

Data Bus Outputs

P+ P- D+ D-

61 626364

Data Bus

Input

RTD 1 RTD 2 RTD 3 RTD 4

1 2 3 4 5 6 7 8 9 10 11 12

SPT-04

Inputs

SPT-04

TR-8080 spt

0

Wh

ite

Red

Red

3

8

TR-7560


Trip

240 110 N

Alarm

1715 18161 32 4 5 8 116 9 127 10 13

RTDCH-R

RTDCH-Y

RTDCH-B 4-20 mA 0-1 mA

Remote o/p

+ +

- -

1920 21

Aux Supply110 / 240 VAC

TR-7560

Outputs Inputs InputOutputs

Figure - 1

FRONT VIEW

260

235

33

031

5

135

EARTHINGCONNECTION MOUNTING

PLATE

CABLEENTRY

SIDE VIEW

235

3 Nos.M-6 THREADS

MOUNTING DETAILS

Note : All dimensions are in mm.

+ 5 0

+ 5

0

20

5Dimension & Mounting Details for TR-7560 & TR-7578 :

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Salient features :

Solid-state design.

Three channel temperature scanner.

Temperature indication range : 0.0 to 199.9 °C.

Two relay outputs – for Alarm & Trip.

4-20mA & 0-1mA outputs for remote temperature indication and / or DAS / SCADA application.

Aux. Supply : 240 / 110 VAC.( Optionally 85-270 VAC/DC & 20-50 VAC/DC ).

TR-7560

9

Terminal details :

Junction BoxJB-01

Sensor details :

Dimension & Mounting Details :

S-02

RTD Sensor

Red

White

Red

Re

d

Re

d

Wh

ite

Pt

- 1

00

RTD Sensor S-02

40 mm max.

Max. 4 mm

Pt-100 elementinside heat shrink sleeve

Extention leads teflon over teflon insulated silver plated copper wires 24/7/32 AWG terminated on Bootlace ferrules(Standard lead length is 1000 mm +25 mm)

Note :O1) RTD Sensor S-02 is suitable over -50 to +200 C temperature range

2) Sensor S-02 is Class B (IEC-60751)O permissible error C = ± [ 0.3 + (.005 x t) ]

O where t is the temperature in C.3) Longer lead lengths are available for specific needs.

These sensors are tested for :

1) DimensionsO O O2) Calibration at 50 C, 100 C & at 180 C

3) Dielectric Strength : 2KV rms for 1 min.

JB-01

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Salient features :

Suitable to all our WTI / WTS.

3 wire, Pt-100 type sensor ( IEC-60751, Class B ).

Temperature range : – 50 to 200 °C.

Standard lead length : 1, 1.5, 2, 3, 5 meter(s)( other lengths are available on demand ).

Dielectric strength : 2K VAC rms, 50 / 60 Hz for 1 min.

Salient features :

Suitable for four S-02 sensor terminations.

Material : ABS.

Protection : IP-66 / NEMA 4X.

Flammability : UL 94 HB.

S-02

10

SFO-01 *

FOXTR-02 *

* These parts are brought to you by PECON from our associates M/s. OSENSA, Canada.

Transformer Protection System

TR-8080-FO + FOXTR-02 + SFO-01

TR-8080-FO

Terminal details :

72 7374

Fault

757677

Fan

NCNC

78 7980

Alarm

81828384858687

Trip

RS-485

GBA

P+ P- D+ D-

61 626364 65 6667 6869 70 71

Remote o/p

+

-

Aux Supply85 - 270 VAC/DCTR-8080-FO

Data Bus Outputs Input

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Note : For dimension & mounting details of TR-8080-FO, please refer Figure - 2 on Page 20.

Salient features & Specifications :

Inputs : 3 fiber optic sensors (SFO-01)

Measurement range : – 45 to 200 °C

Accuracy : +/- 1 °C

USB 2.0 protocol : MODBUS RTU

RS-485 protocol : MODBUS RTU

POWER : 12 - 24 VDC ( 2.5 W max.)

Mounting : 35 mm. DIN rail

Dimension : 114( H ) x 22.5(W) x 100(L) mm.

Sensor Jacket : Teflon

Sensor diameter : Cable - 4 mm, Connector - 10 mm.

Salient features :

Fiber optic sensor simplify the sensor installation in the windings of the transformer where very high voltage insulation is required.



4-20mA and RS-485 MODBUS RTU slave protocol available for remote temperature indication / DAS / SCADA application.

Aux. Supply : 85-270 VAC/DC ( Optionally 20 - 50 VAC/DC ).

TR-8080-FO

DataBus

3 Nos. Teflon Jacketed

Fiber OpticTemp. Probes

Fiber Optic Temperature Sensors

SFO-01

H. T.Coils

64636261

PowerSupply

RS-485

Fiber OpticTemperature Transmitter

FOXTR-02

Location : Marshalling Box

Temperature Display &Scanner UnitTR-8080-FO

RS-485

-

+

A

B

CAST RESIN / DRY TYPE TRANSFORMER

FO Temp.Probe

FO Temp.Probe

FO Temp.Probe

(with fiber optic sensors & transmitter) For HT & EHTTransformer Windings

11

Schematic Diagram :

Thermistor Sensors

TPR-05


Terminal details :

54 6

Fan

7 8 9

Alarm

10 11 12 192021222324

Trip TripReset

Thermistors

F A TAux. Supply

20-270VAC-DC

1 2

TPR-05

Input Outputs Inputs

Wiring Diagram of PTCs & TPR-05:

Push-Buttonto reset

Trip Relay

TripCoil

Contactorfor fan

Aux.Supply20-270

VAC/DCAlarm

SUPPLY

Sensorsfor trip

Sensors for alarm

Sensorsfor fan

F TA

TripReset

Prog. Switches

DIP

19 20 21 22 23 241 2 3 4 75 86

Fan TripAlarm20-270VAC/DC

421 7 105 8 116 9 12

Fan TrpAlm

Sensor Fault

RelayPower

Power Electronics & Control Email : [email protected]

TPR-05

TripResetFan Alm TrpTest

3 PTCs in series

TPR-05

Thermistor Relay

Thermistor Sensor Color Code :

ResponeTemp. C

Wire Colour(DIN 44081)

Our Partno.

70

80

90

100

110

120

130

140

150

160

White / Brown

White / White

Green / Green

Red / Red

Brown / Brown

Grey / Grey

Blue / Blue

White / Blue

Black / Black

Blue / Red

PTS-70

PTS-80

PTS-90

PTS-100

PTS-110

PTS-120

PTS-130

PTS-140

PTS-150

PTS-160

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Salient features :

Sensor : PTC thermistor.

Assembly : Single sensor.

Diameter : Max. 4 mm.

Lead Length : 500 mm. (+/- 10 mm)(Other lead lengths available on demand).

Choice of wide temperature range forsensors ( 70 to 160 °C ).

Salient features :

Input : PTC Thermistors.

Up to 3 PTCs can be connected in series for three phase windings in series for Alarm, Trip & Fan control.

Relay outputs for Alarm, Trip & Fan control.

Enclosure : Cover - Polycarbonate & Base - Noryl.

Mounting : DIN rail TS-35 / TS-35D as per DIN 46277-3.

Aux. Supply : 20 - 270 VAC/DC.

12

Relay Module

TRM-08

ROM-01

Remote Output Module

ROM-01

TRM-08

Terminal details :

414243

A B G

RS-485

ROM-01

11 1312 14 1615 1718

OutputsInputInput DATABUS

Remoteo/p # 1

Remoteo/p # 2

Remoteo/p # 3

+ + +

- - -

E

1 2 3


Terminal details :

COM R1 R3R2 R4 R5 R6 R7 R8

E

1 2 3 4 5 6 7 8 9 10 1819 20

Aux Supply85 - 270 VAC/DCTRM-08

Inputs (External N/O contacts) Input

21 33

RLY-1 RLY-5

22 3423 3524 36

RLY-2 RLY-6

25 3726 3827 39

RLY-3 RLY-7

28 40

Outputs

29 4130 42

RLY-4 RLY-8

31 4332 44

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Salient features :

Input : RS-485 signal from WTS type TR-7570-C,TR-7570-Cx, TR-7576-C, TR-7576-Cx, TR-7577-Cx,TR-7544-C & TR-7578-C.

Outputs : Three isolated 4-20mA current signals corresponding to first three RTD channels of WTS.

Linearity : +/- 0.5%, max load 300 ohms.

Mounting : Din rail TS35 / TS-35D as per DIN 46277-3.

Aux. Supply : 85-270 VAC/DC ( Optionally 20-50 VAC/DC ).

Salient features :

External relay module with built in power supply.

Can be used for multiplying relay contact outputs.

Can be driven from signal relay contacts for connecting power circuits.

Mounting : DIN rail TS35 / TS-35D as per DIN 46277-3.

Built in power supply & as such no need of external 24VDC power supply module. Economical and saves space.

Aux. Supply : 85 - 270 VAC/DC ( Optionally 20 - 50 VAC/DC ).

13

RWTI-400M

Remote Winding Temperature IndicatorRWTI-400C

Terminal details :

Aux. Supply85-270

VAC-DC

9 10

4-20mAOutput

4-20mAInput

1 152 16

+ +

- -RWTI-400M

Outputs Inputs

RWTI-400C

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4-20 mAOutput

RWTI-400C

Field Control Room

IsolatedCurrentSignal

TR-7570-C TR-7570-CxTR-7576-C TR-7576-CxTR-7577-CxTR-7544-CTR-7578-C

RS-485A AB B

1415

WTS

Schematic details for RWTI-400C :

Terminal details :

Aux. Supply85-270

VAC-DC

RS-485MASTER

A B G4-20mAOutput

Outputs Inputs

-RWTI-400C

+

9 101 142 1516


Salient features :

Input signal : 4-20mA current signal.

Provides one repeat isolated 4-20mA current output signal for use on SCADA or additional indication.

Enclosure : ABS ( IP-54 for face ).


Remote Winding Temperature Indicator

RWTI-400M

Salient features :

Input signal : RS-485 from PECON WTS only.

Displays : Set points, relay status and maximum temperature recorded by WTS can be viewed.

Provides one repeat isolated 4-20mA current outputsignal, which can be selected for any channel or currentmax. channel, for use on SCADA or additional indication.

Enclosure : ABS ( IP-54 for face ).


14


TR-7551 / TR-7552 (OTI & WTI)


TR-7551

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Salient features :

Displays both Oil & Winding temperatures simultaneously.

Sensors : For oil temp - RTD Pt-100, IEC-60751. For winding simulation - C.T.

Winding temperature algorithm as per IEC/IEEE standard.

Temperature indication range : Oil : – 40 to 150 °C Winding : – 40 to 200 °C.

Anticipatory Fan & Fan exerciser function.

Test function to simulate operation of OTI & WTI.

Five relay outputs (Refer terminal details given below).

Enclosure : Weatherproof Aluminum die cast (IP-65), with polycarbonate viewing window.


Terminal details :

GBA

RS-485

Terminalsnot

provided

Terminalsnot

provided

13

13

14

14

15

15

OTAlarm

OTAlarm

OTAlarm

16

16

17

17

18

18

WTTrip

Fan1

Fan1

Fan

Fan2

Fan2

19

19

20

20

21

21

OTTrip

WTAlarm

WTAlarm

22

22

25

25

23

23

26

26

24

24

27

27

WTAlarm

OT/WTTrip

OT/WTTrip

RTD

RTD

RTD

OT

OT

OT

WT

WT

WT

CT

CT

CT

5A

5A

5A

COM

COM

COM

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

11

11

12

12

Remote o/p

Remote o/p

Remote o/p

+

+

+

+

+

+

-

-

-

-

-

-

28

28

29

29

13 1415 16171819 202122 2523 2624 271 2 3 4 5 6 7 8 9 10 11 12 2829

13 1415 16171819 202122 2523 2624 271 2 3 4 5 6 7 8 9 10 11 12 2829




TR-7551

TR-7552

TR-7552-C

Inputs

Inputs

Inputs

Outputs

Outputs

Outputs

Input

Input

Input

Input

Input

Input

Outputs

Outputs

Outputs

GBA

RS-485 OTAlarm

WTTrip Fan

OTTrip

WTAlarm

RTDOT WT

CT

5A COM

Remote o/p

+ +

- -

Aux Supply85 - 270 VAC/DCTR-7551-C

Inputs Outputs InputInput Outputs

Output Signals TR-7551 TR-7551-C TR-7552 TR-7552-C

OT Remote output (4-20mA)

YES YES YES YES

WT Remote output (4-20mA)

YES YES YES YES


NO YES NO YES

15

Options :


RWTI-500M

RWTI-500M


RWTI-500C

RWTI-500C


Terminal details :

Aux. Supply85-270

VAC-DC

9 10

OT WT WTOT

1 32 4 1314 1516

+ + + +

- - - -RWTI-500M

4-20mA Outputs Input 4-20mA Inputs

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Salient features :

Input signals : 4-20mA current signal for OT & WT.

Simultaneously displays both oil & winding temperatures.

Provides two repeat isolated 4-20mA current output signals, one for Oil & one for Winding temperatures for use on SCADA or additional indication.

Enclosure : ABS (IP-54 for face).


Salient features :

Input signals : 4-20mA current signal for OT & WT.

Simultaneously displays both oil & winding temperatures.

Provides two repeat isolated 4-20mA current output signals, one for Oil & one for Winding temperatures for use on SCADA or additional indication.

Enclosure : ABS (IP-54 for face).


Terminal details :

RS-485MASTER

Aux. Supply85-270

VAC-DC

A B G

9 10

OT WT

141 32 4 1516+ +

- -RWTI-500C

4-20mA Outputs Input

Schematic details for RWTI-500C :

OTI signal

WTI signal

4-20 mA

4-20 mA

RWTI-500C

Field Control Room

IsolatedCurrent Signals

TR-7551-CTR-7552-CTR-7557-CTR-7558-C

RS-485A AB B

OTI / WTI

148159

16

RTD sensors for OTI & WTIS-07M & S-07F

LR-01

Latch Relay (LR-01)

LR-01

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Salient features & Specifications:

Suitable for all our OTI & WTI.

3 wire, Pt-100 type sensor (IEC-60751, Class B).

Temperature range : – 50 to 200 °C.

Mounting : (1) S-07M : Free rotating with ½” BSP (M) threads. (2) S-07F : Free rotating with ½” BSP (F) threads. (Other threads are available on demand).

Available in duplex style (S-07MD & S-07FD) also.

Dielectric strength : 2K VAC rms, 50 / 60 Hz for 1 min.


Senses momentary contact from pressure switch and operates Alarm & Trip contacts.

Manually reset button for un-latching the relay.

LED indication for latched Alarm & Trip contacts.

Wide supply voltage, selection with simple jumper settings. AC Supply : 120 / 240 (+/- 15%) VAC, 50/60 Hz. DC Supply : 24 (+25%) / 48 (+20%) / 125 (+20%) VDC.

S-07F

S-07M

Terminal details :

InputInput Outputs

Aux. Supply(Jumper Selectable)

E

11 12 136 7 8

Alarm

PressureSwitchContact

9 10

Trip

1 2

LR-01

Voltage

Jumper SelctionJ1

2-3

3-4

1-2

2-3

3-4

120 VAC

240 VAC

24 VDC

48 VDC

125 VDC

17

Annunciator

MA-106 / MA-108 / MA-112 / MA-116

MA-116

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Salient features :

Models for 6, 8, 12 and 16 windows.

Windows size : (1) for 6 & 8 windows : 50 x 20 mm. (2) for 12 & 16 windows : 25 x 20 mm.

Isolated channels and push-buttons input.

Any ISA standard sequence - site selectable.

NO/NC channel selection can be configured on site.

Response time and flash rate are selectable.

Mounting : Flush / Panel type.

Panel cut out : 136 x 136 mm.


Aux. Supply : 85-270 VAC/DC (Optionally 20-50 VAC/DC)

Channel Inputs

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

RingBack

Alarm

47464445

E

394041


OutputsInput

Res

et

Acc

ept

Sile

nce

F/O

Res

et

Test

Com

mon

33 34 35 36 37 38

Keys

13 14 15 16

25 26 27 28 29 30 31 32

MA-116

(16 channels)

MA-112

(12 channels)

MA-108

(8 channels)

MA-106

(6 channels)

Channel Inputs

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

RingBack

Alarm

47464445

E

394041


OutputsInput

Res

et

Acc

ept

Sile

nce

F/O

Res

et

Test

Com

mon

33 34 35 36 37 38

Keys

Channel Inputs

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

RingBack

Alarm

47464445

E

394041


OutputsInput

Res

et

Acc

ept

Sile

nce

F/O

Res

et

Test

Com

mon

33 34 35 36 37 38

Keys

Channel Inputs

1 2 3 4 5 6

1 2 3 4 5 6 7 8 9 10 11 12

RingBack

Alarm

47464445

E

394041


OutputsInput

Res

et

Acc

ept

Sile

nce

F/O

Res

et

Test

Com

mon

33 34 35 36 37 38

Keys

Accept ResetF/O

ResetTest

Power

Power Electronics & Control MA - 116

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

18

Terminal details :

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UT-101 / UT-102 family

Temperature / Process Scanner

Salient features :

8 / 10 / 12 / 16 channels are available.

Sensor i/ps as per table shown below.

2 set points per channel ( Alarm & Trip ).

Relay grouping user settable as per requirement.

One relay can be programmed to operate on sensor fault.

Hysterisis ( Dead band ) user settable.

Time delay for relay operation user settable.

Channels can be added or deleted from Scanning & display.

Channel hold facility.

Programming using front key pad.

Channel number, Channel Status and parameter displayed on eight 0.5 inch displays.

Channel status are indicated using 3 mm LEDs.

Aux. Supply : 90 - 270 VAC/DC. UT-101

Parameters UT-101 UT-101/16 UT-101/SP UT-102/08 UT-102/10 UT-102/12

No of channels 16 16 16 8 10 12

Channel Inputs. Pt-100 & Cu-53

Outputs C/o contacts Open collector C/o contacts

No of outputs 8 32 32 8 6 4

Overall dimensions 192H x 96W x 335D mm 192H x 96W x 265D mm

Any one group1) PT-100 & Cu-532) T/c. J, K, E3) T/c. R, S, T

4-20 ma

/ 0-20 ma

/ 0-10 ma

19

Options :

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Figure - 3

Dimension & Mounting Details forTR-7543 & TR-7544

Notes : - All dimensions are in m.m. - Panel cutout : 92 x 92 mm.

96

96

15 110 20

92


Figure - 2

Note : - All dimensions are in m.m.

X X= =

235 (+5/-0)

15

0 (

+5

/-0

)

M6 Threads

MOUNTING DETAILS

130

SIDE VIEWFRONT VIEW

265

21

55

0

Front CoverFixing Screw(Open for making connections and settings)

20

Dimension & Mounting Details forTR-7570, TR-7576, TR-7577-Cx, TR-7577-Rx,

TR-7541-M, TR-8080 spt, TR-8080-FO, TR-7551, TR-7552

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Dimension & Mounting Details for RWTI-400MC & RWTI-500MC

Figure - 4

Note : - All dimensions are in m.m. - Panel cutout : 92 x 92 mm.

96

96

10 125

90


Figure - 5

Dimension & Mounting Details for SPT-04

Notes : - All dimensions are in m.m. - Din rail mount TS-35 / TS-35D as per DIN 46277-3

100 65

12

5

Front view Side View

Terminals for external connections

Figure - 6

Dimension & Mounting Details for TPR-05

Notes : - All dimensions are in m.m. - Din rail mount TS-35 / TS-35D as per DIN 46277-3

73.570

114

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T154

We are in techno-commercial collaboration with this leading European company,manufacturing temperature monitoring units and ventillation fans. Information

about full range of their products can be found on www.tecsystem.it

Salient features :


Temperature indication range : 0 to 240 °C.

Five relay outputs for Fault, High (Alarm) & Very High (Trip), Fan-1 & Fan-2.

4-20mA o/p for remote temperature indication / DAS / SCADA can be provided using “Module Conv 420-4”.

RS-485 MODBUS RTU slave protocol for DAS / SCADA application can be provided using “BUSMOD-8/A”.

Salient features :


Temperature indication range : 0 to 240 °C.

Four relay outputs for Fault, Fan, High (Alarm) & Very High (Trip).


Winding Temperature Scanner for Dry / Cast Resin type transformers

T154

NT935

NT935

Winding Temperature Scanner for Dry / Cast Resin type transformers

22

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TTG240


Impeller dimension : 60 x 240 mm.

Power supply : 230 / 110 VAC

Frequency : 50 Hz

Max air flow : 180 m3 / hour

Power : 38 W ( +/- 5 W )

Line current : 0.35A @ 230 VAC(+/- 10%) 0.57A@ 110 VAC(+/- 10%)

Max. pressure : 40 Pa

Speed : 2010 rpm

Transformer Cooling Fan(Cross flow type)

NT133 IT

Salient features :

Displays both Oil & Winding temperatures sequentially.

Sensors For oil temperature - RTD Pt-100, IEC-60751For winding simulation - C.T.

Temperature indication range :Oil : – 40 to 150 °C Winding : – 40 to 200 °C.

Anticipatory Fan control function.

Five relay outputs for OT / WT Alarm, OT / WT Trip, Fault, Fan-1 & Fan-2.

4-20mA output for remote temperature indication / DAS / SCADA application can be provided using “MULTIMOD 133”.

RS-485 MODBUS RTU slave protocol for DAS / SCADA application can be provided using “MULTIMOD 133”.


TTG240

Winding Temperature Indicator ( OTI & WTI ) for Oil cooled transformers

NT133 IT

23

Suggestions for Installing S-02 on Dry / Cast Resin transformers

Application Note

S-02 is very reliable and has a long service life. When properly handled and installed, it will lastthroughout the useful life of the transformer and give trouble-free service. Major problems user face in temperature monitoring systems are due to mishandling of S-02, improper S-02 installations and improper wiring. Therefore, take due precautions in handling and installing S-02 and doing correct wiring.

The front portion ( about 2 - 3 cm ) of sensor S-02, contains temperature sensing element and extension joints. This part is very delicate and critical and hence needs utmost care in handling. This portion is well protected by special high temperature sleeves and in normal course nothing should happen to this. However, tapping, pulling or pushing these wires will surely damage these connections and make S-02 unusable. No heavy object should be put on S-02.

During assembly of transformers, if S-02 is pre-installed then chances of damage to S-02 are very high. It is therefore advisable to install S-02 after the assembly of transformer is complete.

Here are few suggestions for your reference,

1. Providing a tube in the interlayer winding

This is to be done at the time of winding the coils. Take about 8 to10 inches long and 5 to 6 mm ID, mica or epoxy tube. Seal it at one end with epoxy. You need to place this tube along the coil length in inter layer gap at top end of the coil and fix it firmly with fibre glass / cotton tape. This is a good and easy arrangement for housing the S-02. Once the transformer is assembled, S-02 can gently be slide / pushed into this tube. To avoid loose S-02, fill this tube with dry MgO powder and seal the upper end of the tube. This arrangement will give a very long operational life for the S-02.

This arrangement also provides a facility to replace the S-02 in case of need in future. S-02 may fail in extremely rare circumstances. To replace this defective S-02, clear this top epoxy seal carefully and take out the defective S-02. Do not try to pull the S-02 out of it’s housing without clearing this top epoxy seal. Put new S-02,and seal the tube as in earlier case.

2. Tying the tube ( after assembly of winding coils )

Take a 8 to10 inches long 5 to 6 mm ID, mica or epoxy tube, seal its one end with epoxy. You need to tie this tube vertically/length wise on the outer surface of the winding coils by fiber glass or other appropriate tape. Rest of the procedure is as described in suggestion given above.

24

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3 - Drill hole on the top of the winding coils

Drill one hole of about 5 mm diameter and at least 25 mm depth on top side of the coil, at a suitable place, after it is casted. Refer adjacent figure. After transformer assembly, S-02 is to be placed in this hole and secured with some high temperature silicon adhesive. It might be convenient to provide one or two additional holes for installing spare S-02.

This arrangement is more common because it is easy to implement. However, this arrangement calls for extra height of insulation, making coil longer.

4. Putting S-02 in cooling ducts of windings

Some of our customers may find the above suggestions difficult to implement, They may therefore, explore the possibility of inserting S-02 in the cooling duct of low voltage coil. But in that case, care should be taken so that S-02 is not left hanging. The vibration of the sensor should be arrested using some mechanism or using some bonding / adhesive materials of suitable temperature grade.

Connections of S-02 leads to Winding Temperature Scanner ( WTS ). The most appropriate & reliable way of terminating leads of S-02, is to terminate them directly on WTS. This avoids problems arising out of loosening of intermediate terminations and wrong wiring. The only disadvantage of this method is the amount of work involved, in case S-02 is to be replaced for any reason. In some cases, it may not be possible to terminate S-02 directly on WTS. In this case, there will be a necessity to provide some intermediate termination arrangement. Here, care must be taken to select proper terminals, with following considerations

terminals are suitable for S-02 leads.

temperature ratings of these terminals.

IMPORTANT PRECAUTIONS

Never install S-02 in HV winding coils.

Avoid S-02 cable running parallel to power / high tension cables, S-02 cables should be grouped with other instrumentation cables.

Tie S-02 lead wires properly and rigidly so that they are securely in place.

The excess lead length should be accommodated in the marshalling box rather than in the transformer enclosure.

Ensure S-02 leads are provided with end ferrules of right size. Never try to solder the free ends of the sensor leads.

It is advisable to mount S-02 on the LV output side of the transformer. This would avoid the chance of accidental flash-over with HV.

Always keep the S-02 sensors in their respective packing till they are installed. All spares or extra sensors should be handled in packed condition only.

25

1. Why do I need to monitor winding temperature of a transformer ?

For economic reasons now-a-days the transformers are operated at “near limits” of temperature ratings. If suitable temperature monitoring system is not installed on the transformer, then there is a very high risk of failure of insulation leading to transformer failure and associated hazards and loss. Hence there is a need for specialized and reliable temperature surveillance system.

Although the dry / cast resin transformers are safer than oil cooled ones from the point of fire hazards, they can also cause disasters, if they exceed the rated temperature limits.

2. Do I need to monitor all three windings of the transformer ?

As dry type / cast resin transformers are usually installed at utilities where large unbalanced load is a normal condition, it is necessary to monitor all the three phase windings of the transformer.

In case of large oil cooled power transformers, they are usually installed at places where the loads are normally balanced and so in that case, monitoring only one winding’s temperature is sufficient. However, It’s always better to monitor temperature of all the three windings.

3. What is a thermal image and how does it help to estimate the winding temperature ?

Due to high voltages associated with the windings and due to insulation considerations, direct access to the windings for installing the temperature sensor is not possible. Therefore, indirect means of estimating this temperature has to be done. One of the most reliable methods to estimate winding temperature is by using “THERMAL IMAGE” formation technique. This image is formed digitally by our ( OTI&WTI ) models, by measuring top oil temperature & current flowing through the winding and doing calculations considering temperature gradient and time constant. And this image is displayed as Winding Temperature. The RTD sensor is installed on the transformer to measure “Top Oil” temperature. Winding current / load current is measured using a C.T. installed in the winding of the transformer. Temperature gradient ( dT ) and Thermal Time constant of windings are estimated by design consideration and set accordingly.

Please note that the Thermal image gives the estimated winding temperature and is not actual.

4. What is the difference between Winding Temperature Scanner (WTS) & Normal Temperature Scanner?

WTS are built specially for transformer application & the features provided in this series of scanners are in line with the requirements of transformer industry.

The operating conditions are more severe for equipments meant for transformer / switchyard application. The design for these scanners is more focused towards reliability, vibration handling, noise immunity, mounting ease, higher ambient temperatures etc. Normal temperature scanners are designed for control rooms where environmental conditions, are much less severe.

This is the reason we call these temperature scanners as “Transformer Protection Relays”. At PECON, we manufacture products for both transformer as well as for control room application. We therefore insist and suggest our customers to use appropriate equipment for specific need and application.

5. What features are essential for a Transformer protection relay (WTS, OTI&WTI) ?

For the safety, reliability & long operational life of a transformer, a good temperature surveillance system is necessary. A good temp. surveillance system should provide the following features:

Accurate temperature measurements (windings, core, oil etc etc).

Capability of warning the user of excessive transformer temperature (alarm). Capable of switching off and isolating the transformer from line in case the transformer reaches a

limiting temperature level (trip). Cooling fan control. Alarm, trip and fan controls settable over operating range. Sensor Fault monitoring and indication. Maximum temperature registering. Signal for remote indication & data logging. Should be suitable for switchyard environmental conditions.

All PECON winding temperature scanners ( Transformer protection relays ) are designed to meet these basic requirements. Most of them will have many additional features incorporated.

6. What is a RTD?

Resistance Temperature Detector or RTD for short, is a device whose resistance changes with temperature. Higher the temperature more the resistance. This change in resistance of these sensors allow us to measure the temperature.

AF Qs

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7. Why RTD ? Why not thermistor ?

The main reasons which make RTD based instruments a better choice for transformer winding temperature measurements are :

RTDs are fully interchangeable.

They have very good accuracy, stability & linearity. They can be easily be tested for their healthiness, while it is very difficult to check the

healthiness of thermistors. With thermistor based equipments,

Temperature indication is not available. Only fixed temperature cut offs are possible and no settability can be given.

RTDs offer higher temperature operating range.

RTDs come at reasonable cost and are easily available.

Thermistor are mostly used in consumer goods. Their industrial use are limited to, where no indication is required and where fixed temperature cut offs with no settability is acceptable.

8. How to check RTD sensor S-02 ?

S-02 can easily be checked with ordinary multimeter. Sensor S-02 being a simple resistance, will show about 110 to 115 Ohms corresponding to room temperature between White and Red lead. Further, both the RED leads should show near zero ohms of resistance. Table below shows the resistance values at different temperatures.

All S-02s coming to you from PECON are checked and calibrated to international standards and traceable to national standards.

9. Do I have to extend all the three leads of RTD to WTS?

Yes, this is necessary to minimize errors in temp. measurement due to lead resistance of the sensor.

10. What type of wire leads should I use for extending RTDs to WTS?

Standard field cables (copper) of 1, 1.5 or 2.5 mm². (as per plant standard) can be used for RTD lead connections. It is recommended to keep RTD leads as small as possible to keep lead resistance errors minimum. Also, try to avoid intermediate joints and terminations. However, this distance in some installations can be as long as few hundred meters. With three wire leads extension, 250 meters of 1.5 mm² extension leads will cause less than 1 °C error. 2.5 mm² wire would cause even lower errors.

11. Is it safe to mount WTS directly on a transformer?

WTS is designed for marshalling box application. However, WTS can be mounted on the transformer enclosure directly, if the transformer is installed in a covered area. Make sure that the surrounding ambient conditions are within the specified limits.

Never mount WTS inside the transformer enclosure, as the temp. inside the enclosure is likely to be more than the permissible maximum ambient temperature limit.

12. What is Fan exerciser function ?

Some of the WTS & ( OTI&WTI ) are provided with this feature. This feature turns on the cooling fan for short time at regular predetermined interval (settable & selectable by the user), irrespective of the temperature of the transformer. This keeps the fan in healthy & working condition.

13. What is Anticipatory fan control function (related to OTI&WTI only) ?

This function helps in better thermal management of a transformer in comparison to conventional WTI systems. By enabling this function, WTI can anticipate the winding temperature rising above the FAN operating set point, much before it actually rises & operates the fan. Studies have proven that this leads to longer life of the transformer.

14. What is fault relay and how do I use it ?

Fault relay is provided to indicate abnormal or fault condition in WTS. These conditions are, No power to the scanner (only for WTS supplied with Electrical Fail fault)

Sensor RTD open or short circuited.

RTD(Pt - 100)

RedRed

White

Temp. Deg. C. 10.00.0 20.0 30.0 40.0

100.0 103.9 107.8 111.7 115.5Resistance Ohms

27

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1. Why do I need to monitor winding temperature of a transformer ?

For economic reasons now-a-days the transformers are operated at “near limits” of temperature ratings. If suitable temperature monitoring system is not installed on the transformer, then there is a very high risk of failure of insulation leading to transformer failure and associated hazards and loss. Hence there is a need for specialized and reliable temperature surveillance system.

Although the dry / cast resin transformers are safer than oil cooled ones from the point of fire hazards, they can also cause disasters, if they exceed the rated temperature limits.

2. Do I need to monitor all three windings of the transformer ?

As dry type / cast resin transformers are usually installed at utilities where large unbalanced load is a normal condition, it is necessary to monitor all the three phase windings of the transformer.

In case of large oil cooled power transformers, they are usually installed at places where the loads are normally balanced and so in that case, monitoring only one winding’s temperature is sufficient. However, It’s always better to monitor temperature of all the three windings.

3. What is a thermal image and how does it help to estimate the winding temperature ?

Due to high voltages associated with the windings and due to insulation considerations, direct access to the windings for installing the temperature sensor is not possible. Therefore, indirect means of estimating this temperature has to be done. One of the most reliable methods to estimate winding temperature is by using “THERMAL IMAGE” formation technique. This image is formed digitally by our ( OTI&WTI ) models, by measuring top oil temperature & current flowing through the winding and doing calculations considering temperature gradient and time constant. And this image is displayed as Winding Temperature. The RTD sensor is installed on the transformer to measure “Top Oil” temperature. Winding current / load current is measured using a C.T. installed in the winding of the transformer. Temperature gradient ( dT ) and Thermal Time constant of windings are estimated by design consideration and set accordingly.

Please note that the Thermal image gives the estimated winding temperature and is not actual.

4. What is the difference between Winding Temperature Scanner (WTS) & Normal Temperature Scanner?

WTS are built specially for transformer application & the features provided in this series of scanners are in line with the requirements of transformer industry.

The operating conditions are more severe for equipments meant for transformer / switchyard application. The design for these scanners is more focused towards reliability, vibration handling, noise immunity, mounting ease, higher ambient temperatures etc. Normal temperature scanners are designed for control rooms where environmental conditions, are much less severe.

This is the reason we call these temperature scanners as “Transformer Protection Relays”. At PECON, we manufacture products for both transformer as well as for control room application. We therefore insist and suggest our customers to use appropriate equipment for specific need and application.

5. What features are essential for a Transformer protection relay (WTS, OTI&WTI) ?

For the safety, reliability & long operational life of a transformer, a good temperature surveillance system is necessary. A good temp. surveillance system should provide the following features:

Accurate temperature measurements (windings, core, oil etc etc).

Capability of warning the user of excessive transformer temperature (alarm). Capable of switching off and isolating the transformer from line in case the transformer reaches a

limiting temperature level (trip). Cooling fan control. Alarm, trip and fan controls settable over operating range. Sensor Fault monitoring and indication. Maximum temperature registering. Signal for remote indication & data logging. Should be suitable for switchyard environmental conditions.

All PECON winding temperature scanners ( Transformer protection relays ) are designed to meet these basic requirements. Most of them will have many additional features incorporated.

6. What is a RTD?

Resistance Temperature Detector or RTD for short, is a device whose resistance changes with temperature. Higher the temperature more the resistance. This change in resistance of these sensors allow us to measure the temperature.

28

We are commited to provide technologically superior products &

high quality services to achieve total customer satisfaction.

We commit ourselves to the highest standards of quality, integrity

and excellence in all areas of business.

We pledge to monitor our performance as an on-going activity and

strive for continual improvement.

Quality Policy

At Power Electronics & Controlpopularly known as

PECON

145 / 2, G.I.D.C. Estate, Naroda, Ahmedabad - 382 330. INDIA.

Tel : +91 ( 79 ) 2281 3432, Fax : +91 ( 79 ) 2282 1397

Cell : + 91 93 2828 1537 / 1538

Email : [email protected]

Website : www.pecon-india.com

Due to continual development and change in technology, specifications are subject to change.

pecon condense catalogue 2013

Documents

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