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This document is the property of ALIK Enerji Sanayi ve Ticaret A. and may not be copied, used, reprinted or distributed by others.

GENERAL ELECTRICITY

COMPANY OF LIBYA (GECOL)

ALIK ENERJSAN.TC.A

POWER SYSTEMS E.P.C. GROUP

KHOMS SCPP

(525 MW POWER PLANT)

Revision History

A 28.04.2014 FOR APPROVAL AAB AAB JMO

REV. DATE DESCRIPTION PREPARED CHECKED APPROVED

DOCUMENT TITLE/SUBJECT:

AUTOMATIC TRANSFER SYSTEM (ATS) OPERATION PHILOSOPHY

PROJECT DOCUMENT NO:

DetailedInformation

Size A-4

Project Unit SystemDisc

Doc.

Type

Orig. Serial No Lang. Eng.

KMS 15 VG_ ER IDM 004No. of

Sheet30

VENDOR DOCUMENT NO:

** if applicable

Rev. No: A

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Doc. No. : KMS-15-VG_-ER_-IDM-004

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This document is the property of ALIK Enerji Sanayi ve Ticaret A. and may not be copied, used, reprinted or distributed by others

INDEX:

1. GENERAL DESCRIPTION ............................................................................................................................... 3

2. MV ATS ................................................................................................................................................................. 5

2.1. MVATSINMANUAL/LOCALMODEOPERATION ............................................................................ 5

2.2. MVATSINMANUAL/REMOTEMODEOPERATION ......................................................................... 7

2.3. MVATSINDISABLEMODE ................................................................................................................... 11

2.4. MVATSINAUTOMATCMODEOPERATION .................................................................................... 11

3. LV ATS ................................................................................................................................................................ 15

3.1. LVATSTYPEA ...................................................................................................................................... 15

3.1.1 LV ATS type A in Local /Manual Mode Operation ............................................................................ 16

3.1.2 LV ATS type A in Manual Mode and Remote mode Operation .......................................................... 18

3.1.3 LV ATS type Ain Disable Mode .......................................................................................................... 21

3.1.4 LV ATS type Ain Automatic Mode Operation ..................................................................................... 21

3.2. LVATSTYPEB ...................................................................................................................................... 25

3.2.1 LV ATS type B in Local /Manual Mode Operation ............................................................................ 25

3.2.2 LV ATS type B in Manual Mode and Remote mode Operation .......................................................... 25

3.2.3 LV ATS type Bin Disable Mode .......................................................................................................... 263.2.4 LV ATS type Bin Automatic Mode Operation ..................................................................................... 26

4. DCS INTERCONNECTION SIGNAL LIST .................................................................................................. 29

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Auto Mode:Being in this mode, ATS will sense the sources. Sensing that a source can

be lost or is being lost, the ATS will transfer the load automatically without loosing

the power in the bus bar. In this mode DCS may not operate neither incomers nor bus

coupling.

Manual operation modes could be selected Locallyor Remotely(from DCS). To select from

where the ATS will be controlled, a L/R selector switch will be provided in the ATS panel.

DCS ATS SWITCH GEAR Interfaces

ATS panel for Local Operation

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2. MV ATS

The MV ATS will controlling the following switchgears:

10BBA01/02

Each ATS manages three (3) circuit breakers:

Circuit Breaker A (Incoming CB)

Circuit Breaker B (Incoming CB)

Circuit Breaker C (Tie Breaker)

The parallel coupling of the two supply lines to the switchgear could be maintained for a short

time, in order to avoid disturbance of load power during changing the supply.

2.1. MV ATS IN MANUAL / LOCAL MODE OPERATION

Manual mode and local mode could be selected in ATS panel

The operator could transfer the load, from one selected incomer to the other one (or vice

versa), through the ATS.

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All the possible scenarios are the followings:

CASE 1: Transfer Signal by Operator.

If, while normal operation (Picture 1), the operator wants to Transfer to Switchgear A,

he should locally close the tie breaker C(before closing ATS shall check

synchronization) and after that open the Circuit Breaker B (incoming to the Bus-bar B)

.

For that the steps to take are as follows in local panel:

1.- ATS should be in manual / local mode

2.- Select breaker of incomer to be closed in local panel

3.- Push transfer command in local panel

4.-After receiving the transfer command, ATS will check synchronization

(synchrocheck or synchcheck relay electrically determines if the difference in voltage

magnitude, frequency and phase angle falls within allowable limits) and then close the

tie breaker (which was open) and open the incoming breaker that has not been

selected.


If, while normal operation (Picture 1), the operator wants to Transfer to Switchgear B,

he should locally close the tie breaker C (before closing ATS shall check

synchronization) and after that open the Circuit Breaker A (incoming to the Bus-bar A)

.







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ATS should be in manual mode



If, while normal operation (Picture 1), the operator wants to Transfer to Switchgear A,


synchronization) and after that open the Circuit Breaker B (incoming to the Bus-bar B)

.

For that the steps to take are as follows:

1.- ATS should be in manual / remote mode

2.- ATS should be available

3.- Select breaker of incomer to be closed in DCS

4.- Push transfer command in DCS panel

5.-After receiving the transfer command from DCS, ATS will check synchronization




selected.


If, while normal operation (Picture 1), the operator wants to Transfer to Switchgear B,


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synchronization) and after that open the Circuit Breaker A (incoming to the Bus-bar

B).










selected.

CASE 8: Fault on Bus A.

When while normal operation (Picture 1) a fault happens on Bus A, Circuit Breaker

A (incoming to the Bus-bar A) will trip. ATS will be locked

CASE 9: Pre-alarm on Unit Auxiliary Transformer A.

If, while normal operation (Picture 1), there is a temperature prealarm or overloading

on Transformer A, Operator in Control Room will notice an alarm.

If there is any operators reaction, tie breaker C should be closed (before closing

ATS shall check synchronization) and, after, the Circuit Breaker A (incoming to the

Bus-bar A) should be opened.

CASE 10: Undervoltage on Bus A.

If, while normal operation (Picture 1), undervoltage is detected on Busbar A (V

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- ATS shall check synchronization and then shall close Tie Breaker C

- ATS shall open Circuit Breaker B.DCS shall change ATS mode from manual to disable

CASE 16: Busbar A re-energization

Busbar A re-energization shall be done in Remote/Manual mode. The Operator should

close the Circuit Breaker A (incoming to the Bus-bar A) and open tie breaker C.

Before closing circuit breaker A, ATS will check synchronism.

CASE 17: Busbar B re-energization

Busbar B re-energization shall be done in Remote/Manual mode. The Operator should

close the Circuit Breaker B (incoming to the Bus-bar B) and open tie breaker C.


2.3. MV ATS IN DISABLE MODE

This option shall be chosen mainly for maintenance purposes when it is required to isolate one

of the supply lines or one of the Bus-bars.

In this situation the system works as it did not exist automatic changeover system, and the

orders of opening and closing of any circuit breaker will not cause any reaction in other

circuit breakers.

2.4. MV ATS IN AUTOMATC MODE OPERATION

Automatic position could be selected or locally if ATS in Local mode or remotely if ATS in

remote mode.

Above statements mean that opening/closing commands are controlled by the ATS.

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When while normal operation (Picture 1) a fault happens on Bus A, Circuit BreakerA (incoming to the Bus-bar B) will trip. ATS will be locked

CASE 19: Unit Auxiliary Transformer A tripped or Undervoltage on Bus A.

If, while normal operation (Picture 1), there is a trip on Transformer A or

Undervoltage on Busbar A (V

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OPERATIONAL TABLE MV ATS

A C

!"#AL $ $ %

T"AS&E" SI'AL () !*E"AT!" L!+ALL) $ $

$ $

!"#AL $ $ %


% $

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

&A/LT ! (/S ( $ %

T"AS&E" &"!# A $ $ $


!"#AL $ %T"AS&E" &"!# ( $ % $


!"#AL $ %

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

$ $

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

% $

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

T"AS&!"#E" A *"EALA"# $ %

$ $

2 % $

!"#AL $ $ %

/1E"3!LTA'E ! (/S A ALA"# $ %

$ $

2 % $

!"#AL $ $ %

&A/LT ! (/S ( $ %

&au0t on (us A "E#!TE ; #A/AL

+ASE &au0t on (us A L!+AL

+ASE 2 &au0t on (us ( L!+AL

+ASE 7aTransfer Si

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A C

!"#AL $ $ %T"AS&!"#E" ( *"EALA"# $ %

$ $

2 $ $

!"#AL $ $ %

/1E"3!LTA'E ! (/S ( ALA"# $ %

$ $

2 $ $

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

% $

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

$ $

/1E"3!LTA'E ! (/S A $ % $

"E>EE"'IATI! (/S(A" A $ $

$ %

/1E"3!LTA'E ! (/S ( $ $ $

"E>EE"'IATI! (/S(A" ( $ $

$ %

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

$ $

% $

!"#AL $ $ %

&A/LT ! (/S ( $ %

!"#AL $ $ %

$ $

$ $

1ISA(LE ATS 1ISA(LE

L!+AL 1+S (L!+KE1

#A/AL

A/T!

89: Times indicated are orientab0e. Time of /ndervo0ta

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3. LV ATS

The LV automatic changeover systems (ACO) to be considered are the following ones:

LV ATS Type A: Connection between 2 Normal LV Switchgears.

LV ATS Type B: Connection between 2 Essential LV Switchgears and 1

Emergency Diesel Group.

The following General considerations have to be taken into account in order to guarantee the

proper working of the Automatic Change Over System:

At least two CBs must be closed.

All the circuit breakers must be not tripped.

No fault in any Busbar.

All Circuit Breakers shall be in Remote Mode.

All Circuit Breakers shall be available in DCS (grouped signals: Remote Mode, No

test mode, CB inserted ):

3.1. LV ATS TYPE A

Controlling the switchgears:

11BFB01/02

12BFB01/02

10BFA01/02

Each ATS manages three (3) circuit breakers:


Circuit Breaker B (Incoming CB)

Circuit Breaker C (Tie Breaker)

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3.1.1 LV ATS type A in Local /Manual Mode Operation

Manual mode and local mode could be selected in ATS panel

The operator could transfer the load, from one selected incomer to the other one (or vice

versa), through the ATS.



If, while normal operation, the operator wants to Transfer to Switchgear A, he should

locally close the tie breaker C(before closing ATS shall check synchronization) and

after that open the Circuit Breaker B (incoming to the Bus-bar B) .






(synchrocheck or synchcheck relay electrically determines if the difference in voltagemagnitude, frequency and phase angle falls within allowable limits) and then close the


selected.


If, while normal operation, the operator wants to Transfer to Switchgear B, he should

locally close the tie breaker C (before closing ATS shall check synchronization) and

after that open the Circuit Breaker A (incoming to the Bus-bar A) .

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For that the steps to take are as follows in local panel:1.- ATS should be in manual / local mode







selected.


When while normal operation, a fault happens on Bus A, Circuit Breaker A

(incoming to the Bus-bar A) will trip. ATS will be locked.

CASE 4: Fault on Bus B.

When while normal operation a fault happens on Bus B, Circuit Breaker B

(incoming to the Bus-bar B) will trip. ATS will be locked.

CASE 5: Transfer Signal by Operator to come to normal operation.

If, the operator wants to go to normal operation fromTransfer A or B busbar, he should

locally close Circuit breaker of the incomer A or B, that was opened (before closing

ATS shall check synchronization) and after that open the tie Breaker C.



2.- Select INC-1/INC-2 in local panel




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breaker (which was open) and open the tie breaker.

3.1.2 LV ATS type A in Manual Mode and Remote mode Operation

Being the ATS in manual mode (this operation mode could be selected remotely if ATS in

remote mode), the operator could transfer the load, from one selected incomer to the other (or

vice versa), through the ATS.

ATS should be in manual mode



If, while normal operation, the operator wants to Transfer to Switchgear A, he should

locally close the tie breaker C (before closing ATS shall check synchronization) and

after that open the Circuit Breaker B (incoming to the Bus-bar B) .





4.- Push transfer command in DCS panel5.-After receiving the transfer command from DCS, ATS will check synchronization




selected.


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If, while normal operation , the operator wants to Transfer to Switchgear B, he should

locally close the tie breaker C (before closing ATS shall check synchronization) andafter that open the Circuit Breaker A (incoming to the Bus-bar B) .










selected.


When while normal operation a fault happens on Bus A, Circuit Breaker A

(incoming to the Bus-bar A) will trip. ATS will be locked

CASE 9: Pre-alarm on MV/LV Transformer A.

If, while normal operation , there is a temperature prealarm or overloading on

Transformer A, Operator in Control Room will notice an alarm.


ATS shall check synchronization) and, after, the Circuit Breaker A (incoming to the

Bus-bar A) should be opened.

CASE 10: Undervoltage on Bus A.

If, while normal operation , undervoltage is detected on Busbar A (V

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ATS shall check synchronization) and, after, the Circuit Breaker A (incoming to theBus-bar A) should be opened.

CASE 11: Fault on Bus B.

When while normal operation a fault happens on Bus B, Circuit Breaker B

(incoming to the Bus-bar B) will trip. ATS will be locked

CASE 12: Pre-alarm on MV/LV Transformer B.

If, while normal operation , there is a temperature prealarm or overloading on

Transformer B, Operator in Control Room will notice an alarm.


ATS shall check synchronization) and, after, the Circuit Breaker B (incoming to the

Bus-bar B) should be opened.

CASE 13: Undervoltage on Bus B.

If, while normal operation , undervoltage is detected on Busbar B (V

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CASE 15: MV/LV TRANSFORMER B in maintenance:

If while Normal Operation, with ATS in Remote Mode it is decided to make amaintenance to MV/LV Transformer B, Distributed Control System (DCS) will

send the transfer order to ATS:

- ATS shall check synchronization and then shall close Tie Breaker C

- ATS shall open Circuit Breaker B.

DCS shall change ATS mode from manual to disable

CASE 16: Busbar A re-energization

Busbar A re-energization shall be done in Remote/Manual mode. The Operator should

close the Circuit Breaker A (incoming to the Bus-bar A) and open tie breaker C.


CASE 17: Busbar B re-energization

Busbar B re-energization shall be done in Remote/Manual mode. The Operator should

close the Circuit Breaker B (incoming to the Bus-bar B) and open tie breaker C.


3.1.3 LV ATS type Ain Disable Mode

This option shall be chosen mainly for maintenance purposes when it is required to isolate one

of the supply lines or one of the Bus-bars.

In this situation the system works as it did not exist automatic changeover system, and the

orders of opening and closing of any circuit breaker will not cause any reaction in other

circuit breakers.

3.1.4 LV ATS type Ain Automatic Mode Operation

Automatic position could be selected or locally if ATS in Local mode or remotely if ATS in

remote mode.

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Above statements mean that opening/closing commands are controlled by the ATS.

In Operational Table LV ATS type A all the scenarios have been explained as follows:


When while normal operation (Picture 1) a fault happens on Bus A, Circuit Breaker

A (incoming to the Bus-bar B) will trip. ATS will be locked

CASE 19: MV/LV Transformer A tripped or Undervoltage on Bus A.

If, while normal operation (Picture 1), there is a trip on Transformer A or

Undervoltage on Busbar A (V

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OPERATIONAL TABLE LV ATS TYPE A

A C !"#AL $ $ %


$ $

!"#AL $ $ %


% $

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

&A/LT ! (/S ( $ %

T"AS&E" &"!# A $ $ $


!"#AL $ %

T"AS&E" &"!# ( $ % $


!"#AL $ %

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

$ $

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

% $

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

T"AS&!"#E" A *"EALA"# $ %

$ $

2 % $

!"#AL $ $ %

/1E"3!LTA'E ! (/S A ALA"# $ % $ $

2 % $

!"#AL $ $ %

&A/LT ! (/S ( $ %

+ASE B Transfer Si

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A C !"#AL $ $ %

T"AS&!"#E" ( *"EALA"# $ %

$ $

2 $ $

!"#AL $ $ %

/1E"3!LTA'E ! (/S ( ALA"# $ %

$ $

2 $ $

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

% $

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

$ $

/1E"3!LTA'E ! (/S A $ % $


$ %

/1E"3!LTA'E ! (/S ( $ $ $"E>EE"'IATI! (/S(A" ( $ $

$ %

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

$ $

% $

!"#AL $ $ %

&A/LT ! (/S ( $ %

!"#AL $ $ %

$ $

$ $

1ISA(LE ATS 1ISA(LE

L!+AL 1+S (L!+KE1

#A/AL

A/T!

T"AS&!"#E" A T"I*

/1E"3!LTA'E ! (/S A

T"AS&!"#E" ( T"I*

/1E"3!LTA'E ! (/S (

+ASE $C &au0t on (us A "E#!TE ; A/T!

+ASE $=#3L3 Transformer @A tripped or

/ndervo0taener

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3.2. LV ATS TYPE B

Controlling the switchgears:

10BMA01/02

This ATS manages three (3) circuit breakers:


Circuit Breaker B (Incoming CB) Circuit Breaker C (Tie Breaker)



3.2.1 LV ATS type B in Local /Manual Mode Operation

LV ATS Type B shall work as LV ATS Type A

3.2.2 LV ATS type B in Manual Mode and Remote mode Operation

LV ATS Type B shall work as LV ATS Type A with the following exceptions:

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cases related to MV/LV Transformers have also been modified or eliminated, becauseincomers of busbar A or B are from BFA busbar

in case of no power supply in Bus-bars B after the transfer done, EDG will start

automatically to feed the essential loads according to document EGDs philosophy.

3.2.3 LV ATS type Bin Disable Mode

LV ATS Type B shall work as LV ATS Type A

3.2.4 LV ATS type Bin Automatic Mode Operation

LV ATS Type B shall work as LV ATS Type A with the following exceptions:

cases related to MV/LV Transformers have also been modified or eliminated, because

incomers of busbar A or B are from BFA busbar

in case of no power supply in Bus-bars B after the transfer done, EDG will start

automatically to feed the essential loads according to document EGDs philosophy.

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OPERATIONAL TABLE LV ATS TYPE B

A C !"#AL $ $ %


$ $

!"#AL $ $ %


% $

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

&A/LT ! (/S ( $ %

T"AS&E" &"!# A $ $ $


!"#AL $ %

T"AS&E" &"!# ( $ % $


!"#AL $ %

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

$ $

!"#AL $ $ %

T"AS&E" SI'AL () 1+S $ $

% $

!"#AL $ $ %

&A/LT ! (/S A % %

+ASE = *re>a0arm on #3L3 Transformer @A

!"#AL $ $ %

/1E"3!LTA'E ! (/S A ALA"# $ %

$ $

2 % $

!"#AL $ $ %&A/LT ! (/S ( $ %

A

if there i s an operatorDs reaction

+ASE B Transfer Si

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A C +ASE $ *re>a0arm on #3L3 Transformer @(

!"#AL $ $ %

/1E"3!LTA'E ! (/S ( ALA"# $ %

$ $

2 $ $

+ASE $2 T"AS&!"#E" A I #AITEA+E

+ASE $7 T"AS&!"#E" ( I #AITEA+E

/1E"3!LTA'E ! (/S A $ % $


$ %

/1E"3!LTA'E ! (/S ( $ $ $

"E>EE"'IATI! (/S(A" ( $ $

$ %

!"#AL $ $ %

&A/LT ! (/S A % %

!"#AL $ $ %

$ $

% $!"#AL $ $ %

&A/LT ! (/S ( $ %

!"#AL $ $ %

$ $

$ $

1ISA(LE ATS 1ISA(LE

L!+AL 1+S (L!+KE1

#A/AL

A/T!

+ASE $ /ndervo0taenerener

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4. DCS INTERCONNECTION SIGNAL LIST

As per this operation philosophy there will be the following signals exchange between ATS

and DCS:

SIGNALSIGNAL TYPE (in

DCS)

SIGNAL

VOLTAGE

LEVEL

DESCRIPTION

1isab0e #ode 1!

#aintained type

2 3dc

8A+!:

1isab0e mode se0ection from 1+S J#I

#anua0 #ode 1!

#aintained type

2 3dc

8A+!:

#anua0 mode se0ection from 1+S J#I

Auto #ode 1!

#aintained type

2 3dc

8A+!:

Auto mode se0ection from 1+S J#I

Incomer> $ Se0ected 1!

#aintained type

2 3dc

8A+!:

Incomer $ se0ected from 1+S J#I

Incomer> Se0ected 1!

#aintained type

2 3dc

8A+!:

Incomer se0ected from 1+S J#I

I+>$I+>

Se0ected

1!

#aintained type

2 3dc

8A+!:

I+>$I+> se0ected from 1+S J#I. To

come to norma0 situation

Transfer +ommand 1!

*u0se type

87 sec:

2 3dc

8A+!:

+ommand from 1+S to reuire ATS to

rea0iGe a manua0 transfer accordin< to

the se0ection done.

Avai0ab0e 1I

#aintained type

2 3dc

81+S:

ATS is ready for operation no a0arm,

poFer supp0y o-, etc.

1isab0e

1I

#aintained type

2 3dc

81+S:

ATS is out of order. In this situation

1+S can open and c0ose incomers and

bus coup0er but never can c0ose a00 of

them at the same time.

#anua0 #ode1I

#aintained type

2 3dc

81+S:

ATS is in #anua0 #ode. In this situation

1+S cannot operate incomers or bus

coup0er. ATS Fi00 operate them

Auto #ode1I

#aintained type2 3dc81+S:

ATS is in Auto #ode. In this situation

1+S cannot operate incomers or bus

coup0er. ATS Fi00 operate them

"emote #ode1I

#aintained type

2 3dc

81+S:

ATS is in "emote #ode. 1+S can

se0ectcontro0 ATS operation modes

disab0e, manua0 or auto mode

Loca0 #ode1I

#aintained type

2 3dc

81+S:

ATS is in Loca0 #ode. Loca00y operator

can se0ectcontro0 ATS operation

modes disab0e, manua0 or auto mode

Transfer 1one 1I

*u0se type

87 sec:

2 3dc

81+S:

ATS feedbac-. Transfer correct0y done.

8/11/2019 MV ATS 3-12.pdf

30/30

AUTOMATIC TRANSFER

SYSTEM (ATS)

OPERATION

PHILOSOPHY


Page : 30 OF 30

Date : 28.04.2014

Revision : A

SIGNALSIGNAL TYPE (in

DCS)

SIGNAL

VOLTAGE

LEVEL

DESCRIPTION

A0arm 1I

#aintained type2 3dc

81+S:

ATS has

mv ats 3-12.pdf

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