Sync System

8/10/2019 Sync System

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00110066-9-V01-G00Z-00224

2010/12/02 , 11:44:51 AM

E0716 100 I90 DM 002 A

Mohamed El Safty

4


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KHARAFI NATION SABIYA

GENERAL INFORMATION

SYNCHRONIZATION PRINCIPLE

GE Energy Products - Europe

Reference : 172A7791 Rev. : A Section : 01 Page : 1/23

Ce document, proprit exclusive de GE Energy Products France SNCest strictement confidentiel. Il ne peut tre communiqu,

copi ou reproduit sans notre autorisation crite.

This document, exclusive property of GE Energy Products France SNCis strictly confidential. It must not be communicated,

copied or reproduced without our prior written consent.

SUMMARY

1. SUBJECT 4

2. EQUIPMENT - INTERFACES 5

2.1. GENERATOR CIRCUIT BREAKER (52G) 5

2.2. LINE CIRCUIT BREAKER (52L) 5

2.3. MEASURE CIRCUIT 5

2.4. GENERATOR CONTROL PANEL 5

2.5. GAS TURBINE CONTROL SYSTEM SPEEDTRONIC 6

2.6. OPERATOR INTERFACE ( LOCAL HMI ) 6

3. SYSTEM OPERATION 7

3.1. STEADY STATE OPERATION 7

3.1.1. GT IN NORMAL OPERATION 7

3.1.2. GT IN STAND-BY 7

3.1.3. GT ISLANDED 7

3.1.4. GT ON DEAD BUS OPERATION 8

3.2. TRANSIENT OPERATIONS 8

3.2.1. 52G SYNCHRONIZING 9

3.2.2. 52L SYNCHRONIZING 10

3.2.3. VOLTAGE RECOVERY 52G DEADBUS CLOSURE 11

3.2.4. 52G OPENING 11

3.2.5. 52L OPENING 11

4. CONTROL AND INSTRUMENTS LOOPS 11

4.1. PRINCIPLE SCHEME 11

5. LACKING OF CONTROL AND POWER 11

5.1. POWER SUPPLY DIAGRAM 11

5.2. TROUBLE DESCRIPTION 13

APPENDIX 1 14

Figure 1 Generator Synchronizing System 15

Figure 2 Automatic synchronizing on PTUR 16

DT-1CDT-1C


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Figure 3 Synchronization check on PPRO 17

Figure 3 Hardwire system synchronization 18

APPENDIX 2 19

52G SYNCHRONIZING DIAGRAM 20

52L SYNCHRONIZING DIAGRAM 20

52L SYNCHRONIZING DIAGRAM 21

VOLTAGE RECOVERY DIAGRAM - 52G DEAD BUS CLOSING 22

PRINCIPLE SCHEME 23


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STATE OF MODIFICATIONS

INDEX DATE DESCRIPTION

A 19/06/07 First issue


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BUS

Synchro.

GT

52G

Electrical diagram

52L

1. SUBJECT

The purpose of the present document is the technical description of the different ways to synchronize theGT Unit with the Customer bus and to open the Gas Turbine Generator circuit breaker (52G). Thisdocument describes Generator circuit breaker synchronization and electrical interfaces between thedifferent cubicles for this operation.

The evacuation of the energy produced by the Gas Turbine on the networkoccurs mainly across the Generator circuit breaker 52G, situated between thegenerator and the main transformer. The closing of this circuit breaker issecured by the synchronizing function of the generator cubicle.

The 52G and 52L synchronization can be controlled:- manually or automatically from the local and remote server Gas Turbine

Control operator interface

The 52G closing on a dead bus is possible.

The aim of synchronization is to connect the Gas Turbine Generator voltage with the network voltage tofeed the electrical power on the network. To realize this connection without equipment damage, the 2alternating voltages must have the same phase sequence and frequency and the Gas Turbine Generatorvoltage must correspond to the existing line voltage.


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2. EQUIPMENT - INTERFACES

2.1. GENERATOR CIRCUIT BREAKER (52G)

It realizes the power connection between the Generator and the GT transformer.In general a local command is powered by 125 VDC.

Control cubicles interfaces concern circuit breaker closing / tripping commands and circuit breakerposition :

Closing command is sent on 1 way from the synchronizer. Command voltage must be 125 VDC forthe Speedtronic synchro-check.

Tripping command is sent on 2 ways from electrical protections, from reverse power when GT shutsdown or from an operators order (by HMI server)

Circuit breaker position is used to valid closing order in the synchronizer system.

2.2. LINE CIRCUIT BREAKER (52L)

It realizes the power connection between the GT transformer and the plant network.If the breaker is controlled by the GCP this system receives:- 1 closing order, (Closing command is sent on 1 away by Speedtronic)- Tripping command is sent on 2 ways from electrical protections and operator order.

2.3. MEASURE CIRCUIT

This circuit consists of voltage transformers upstream and downstream of the circuit breaker.

1 transformer measures the voltage upstream of the generator circuit breaker. The characteristics are

Un 3/1003.

1 transformer measures the voltage downstream the generator circuit breaker. The characteristics are

Un

3/100

3. 1 transformer measures the voltage upstream the line circuit breaker. The characteristics are

Un 3/1003.

1 transformer measures the voltage downstream the line circuit breaker. The characteristics are

Un 3/1003.

2.4. GENERATOR CONTROL PANEL

This cubicle includes synchronizing facilities.

-

52G/52L voltages management, ( Matching Transformer)- Voltage relay for dead bus for all phases operation,- 52G/52L control . ( Closing and Tripping Order 2 ways)


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3. SYSTEM OPERATION

The circuit breaker synchronizing or closing is a transient operation which allows the machine set to gofrom a steady state operation to a new one in order to produce electrical power on the network.

3.1. STEADY STATE OPERATION

In the Plant, the steady states correspond to the states in which the machine set can stay permanentlyuntil an operator order or automation protection operates. This is a function of the circuit breakerpositions, the Network state, and the GT state.

3.1.1. GT IN NORMAL OPERATION

In normal configuration,

52G circuit breaker is closed

52L circuit breaker is closed GT is running

The HV bus is aliveThe GT generator is connected to the network or to the bus.

3.1.2. GT IN STAND-BY

52G circuit breaker is open

52L circuit breaker is closed

GT is in operation or not

The HV bus is alive

Two different situations can exist :

- To start the unit, the bus must supply the electrical cranking motor.If GT generator is excited then the operator has to close 52G breaker by synchronization. If GTgenerator is not excited and the GT is running, the operator has to give a GT STOP order and waitfor GT speed at 14HS state in order to send a GT START order.

- The group circuit breaker is automatically open as there was a problem on HV line or by anyprotection panel command. In this case, the Unit is islanded. Then, GT speed is at 100,3% nominal

speed, the GT frequency is automatically and progressively set at 50Hz 0.2% (except forisochronous mode) and the GT load is automatically adjusted.After solving hypothetical HV problem, the operator can re-synchronize the GT with the bus byclosing the 52G circuit breaker by synchronization.

3.1.3. GT ISLANDED

52G circuit breaker is closed 52L circuit breaker is open

GT is running

The HV bus is aliveThe line circuit breaker is automatically open as there was a problem on HV line or by any protectionpanel command. In this case, the Unit is islanded. Then, GT speed setpoint is at 100,3% nominal speed,After solving hypothetical HV problem, the customer will have to re-synchronize the GT by closing the52L circuit breaker by synchronization.


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3.1.4.GT ON DEAD BUS OPERATION

52G circuit breaker is open

52L circuit breaker is open

GT is in operation or not

The HV bus is dead or notWhen the Gas Turbine is starting, the unit runs until Full Speed No Load. When the dead bus couplingpermissives are present (no voltage downstream the 52G breaker and 52L breaker open), the 52G circuitbreaker can be closed by dead bus closing order, and the GT generator will supply the main transformer.Then, the 52L breaker will have to be closed by synchronization (will be performed by customer facilities).

If the Gas Turbine is stopped, the operator can close the 52L breaker by an "Override" order, in order tofeed the main transformer (By Customer).

3.2. TRANSIENT OPERATIONS

The transient operations allow the transfer from a steady state to an other. In that system, the final targetis to feed the HV Bus. The different steady and transient states are summarized as follow :

52L SYNCHRONIZING

GT ISLANDED

GT IN NORMALOPERATION

STATE

GT IN STAND-BY

52G SYNCHRONIZINGwith 52L closed52G OPENING

52L OPENING

GT ON DEAD BUSOPERATION

VOLTAGE RECOVERY

52G DEAD BUS CLOSURE


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3.2.2.52L SYNCHRONIZING

To realize line circuit breaker synchronization, the Gas Turbine must be islanded and the generator

circuit breaker (52G) must be closed. The basic principle is to close the Line circuit breaker (52L) whenall conditions (voltages, phases and external permissive) are satisfied.

Two synchronizing main modes are available:- AUTOMATIC SYNCHRONIZING MODE- MANUAL SYNCHRONIZING MODE

AUTOMATIC SYNCHRONIZING MODE

When this mode is selected, synchronizing operation is realized directly by the Speedtronicsynchronizing system. The operator will select the circuit breaker to synchronize ( in local, from thelocal and in remote, from the remote or the DCS). Automatic synchronizing operationis activated by a GT START order ( in local, from the local and in remote, from the remote

or the DCS) if the permissive to synchronize is true. If the gas turbine is already started, theoperator can "re" synchronize the unit if ISOCHRONOUS mode is deactivated by pushing theRESYNC Button . The synchronizing sequence is realized without operators intervening.Generator excitation voltage and turbine speed adjustments are calculated by the Speedtronicsynchronizing system, until the Generator voltage and frequency equal respectively the line voltageand frequency. When the conditions are correct, the automatic-synchro-device gives the closingorder to the generator circuit breaker (52L). During each automatic closing, the SPEEDTRONICcounts and memorises the closing time.For added protection a synchronism check relay (K25P or K25A) is provided in the Speedtronic . It isused in series with both the automatic synchronizing relay and the manual breaker close switch toprevent large out-of-phase breaker closures.

MANUAL SYNCHRONIZING MODE

From the local or remote server operator interface , SYNC MANU command activates thismode. In first time, the operator has to select 52L by using the 52G / 52L circuit breaker selectiontarget. By looking voltage, frequency and phase information, the operator can adjust Generator

frequency and voltage by the SPEED orders and the U orders selectors until Generatorside voltage and bus voltage are equal. The operator with the control switch of the 52L circuit breakergives 52L closing order.

If voltages, phases or frequencies are not equal, the synchronism check relay of Speedtronicinhibits operators closing order.

The closing order signal the both case is sent to GCP and the GCP give the final order through thepower

Contactor.


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3.2.3. VOLTAGE RECOVERY 52G DEADBUS CLOSURE

This is enabled if the following conditions are validated: GT at FSNL.

Generator breaker selected

Signal confirming that the HV bus is dead (voltage relay in GCP).

Generator breaker open

Line breaker open

DEADBUS closure order activated on the HMI.

Then the Gas Turbine control system (Speedtronic) realizes automatically the deexcitation of thegenerator (to avoid to magnetize the main transformer at full voltage), waits around 15 seconds and thencloses the excitation relay and the 52G.

3.2.4. 52G OPENING

The generator circuit breaker is automatically opened during GT shutdown operation by the reversepower relay or during load-shedding operation by generator protection relays. It must be noted that theGenerator breaker (52G) can be opened manually at any time during the Turbine running from the HMI

3.2.5.52L OPENING

The 52L circuit breaker can be opened manually at any time during the Turbine running from the HMI.

4. CONTROL AND INSTRUMENTS LOOPS

4.1. PRINCIPLE SCHEME

Refer to Appendix 2.

5. LACKING OF CONTROL AND POWER

5.1. POWER SUPPLY DIAGRAM


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125 VDC

Motor of Circuit breaker

Automatic-synchro device

Tripping coil

Trippingcoil

Closingcoil

D1

D3

D2Line 1

Line 2


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APPENDIX 1


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Figure 1 Generator Synchronizing System


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Figure 2 Automatic synchronizing on PTUR


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Figure 3 Synchronization check on PPRO


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Figure 3 Hardwire system synchronization


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APPENDIX 2


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52G SYNCHRONIZING DIAGRAM

SYNC AUTO COMMANDFROM

SPEEDTRONICSYNCHRO-DEVICE

VOLTAGES EQUALITY

PHASES &FREQUENCIES EQUALITY

EXCITATIONVOLTAGE +/-

ORDERS

TURBINESPEED +/-ORDERS

SPEEDTRONICSYNCHRO CHECK RELAY

ORDER

52G CIRCUIT BREAKER

CLOSING ORDER TOGCP

52G CIRCUIT BREAKER CLOSINGFROM GCP TO SWITCHYARD

CIRCUIT BREAKER CLOSED INFORMATION

SPINNING RESERVE

ACTIVATED

no

no

no

yes

yes

yes

VOLTAGE & FREQUENCYMEASURE AT THE

GENERATOR OUTLET

VOLTAGE & FREQUENCY MEASUREBY THE MV NETWORK SIDE

LINE CIRCUIT BREAKERCLOSED AND BUS ALIVE

Ev. RESYNC(local or remote)

ACTIVATED

VOLTAGES EQUALITY


OPERATOR VISUAL CHECK ATTHE DIFFERENTIAL VOLTMETER

OPERATOR VISUAL CHECK ATTHE SYNCHRONOSCOPE

52G MANUAL CLOSINGORDER (local or remote)


MANUALORDERS

TURBINESPEED +/-MANUALORDERS


PERMISSION

no

no

no

yes

yes

yes

ACTIVATED

SYNC MANU COMMANDFROM

ACTIVATED

GT at FULL SPEED NOLOAD AND 52G OPEN

MONITOR


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52L SYNCHRONIZING DIAGRAM

SYNC AUTO COMMANDFROM

SPEEDTRONICSYNCHRO-DEVICE

VOLTAGES EQUALITY



ORDERS

TURBINESPEED +/-ORDERS


CLOSE

52L CIRCUIT BREAKERCLOSING ORDER TO

GCP

52L CIRCUIT BREAKER CLOSINGFROM GCP TO SWITCHYARD


ACTIVATED

no

no

no

yes

yes

yes

VOLTAGE & FREQUENCYMEASURE UPSTREAM LINE

CIRCUIT BREAKER

VOLTAGE & FREQUENCY MEASURE

DOWNSTREAM LINE CIRCUIT BREAKER

GENERATOR CIRCUITBREAKER CLOSED AND

BUS ALIVE

52L Selection validation(local or remote)

ACTIVATED

52L Selection validation

52L

VOLTAGES EQUALITY


OPERATOR VISUAL CHECK ATTHE DIFFERENTIAL VOLTMETER

OPERATOR VISUAL CHECK ATTHE SYNCHRONOSCOPE

52L MANUAL CLOSINGORDER (local or remote)


MANUALORDERS

TURBINESPEED +/-MANUALORDERS


PERMISSION

no

no

no

yes

yes

yes

ACTIVATED

SYNC MANU COMMANDFROM

ACTIVATED

GT at FULL SPEED NOLOAD AND 52L OPEN

52G / 52L SELECTORSWITCH


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VOLTAGE RECOVERY DIAGRAM - 52G DEAD BUS CLOSING

52G AND EXCITATION CIRCUITBREAKER CLOSING ORDER

52G CIRCUIT BREAKER CLOSING


GT at FULL SPEED NO LOADAND 52G OPEN

SPEEDTRONICPERMISSIVE27BN


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