LA CANCIÓN PROTESTA: REFLEJO DE UN CONFLICTO, VOZ DE UNA SOCIEDAD PARTIDA

Application: This document provides instructions for performing Manual Synchronization, and applies units regardless of the Exciter/Voltage Regulator applied.

PHASE ROTATION CHECKS

Required Tools: Voltmeter rated for generator terminal voltage, high voltage gloves, face shield and ground mat.

A full voltage test with “hot sticks” across like phases is highly recommended.

A full voltage rotation test consists of utilizing a voltmeter rated for the voltage of the generator.

The following is a short procedure that should be carried out by qualified personnel only.

Ensure that the breaker is racked out and in the test position before performing checks.

Locate a high voltage test stick for checking the voltage difference (hence phase angle) between the Bus and Generator Phase A, then B and then C. Only persons with proper training should attempt this procedure.

Record data Check

Completed Completed by / date Verify that field wiring between the generator

control panel and the switchgear is complete and correct.

Turn the voltage regulator off.

Tape off area for testing personnel only. Rack out generator breaker and expose bus bars.

Verify the breaker close circuit is disabled and that synchronizing is OFF.

Verify bus voltage and frequency readings on control panel meters. Record readings.

Start the unit and bring it to synchronous speed.

Start the voltage regulator. At the generator control panel, verify that the synchronizing lights and the synchroscope are functioning.

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Record data Check

Completed Completed by / date At the generator control panel, verify that Voltage

Raise and Lower Switch is working.

Verify that the raise and lower voltage buttons are working on the HMI.

At the generator control panel, verify that Governor Raise and Lower Switch is working.

Verify that the raise and lower speed/load buttons are working on the HMI.

Adjust generator voltage and speed until the generator and bus voltage and frequency as indicated on the meters are the same, with the synchroscope is rotating slowly in the fast direction.

When the sync lights are extinguished and the sync needle at 12 o‟clock position, verify that Phase A Generator-to-Bus voltage difference is zero using the high voltage test sticks. At 6 o‟clock verify that Phase A Generator-to-Bus voltage difference is at the maximum voltage.

This proves that the synch scope indicates in-phase when the buses are actually in in-phase.

When the sync lights are extinguished and the sync needle at 12 o‟clock position, verify that Phase B Generator-to-Bus voltage difference is zero using the high voltage test sticks. At 6 o‟clock verify that Phase B Generator-to-Bus voltage difference is at the maximum voltage.

This proves that the synch scope indicates in-phase when the buses are actually in in-phase.

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Record data Check

Completed Completed by / date When the sync lights are extinguished and the

sync needle at 12 o‟clock position, verify that Phase C Generator-to-Bus voltage difference is zero using the high voltage test sticks. At 6 o‟clock verify that Phase C Generator-to-Bus voltage difference is at the maximum voltage.

This proves that the synch scope indicates in-phase when the buses are actually in in-phase.

Remove the high voltage test sticks.

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Manual Synchronizing Circuit

Before performing this check, ensure the phase rotation is correct. Perform any required off-line checks for the voltage regulator.

Record data Check

Completed Completed by / date Verify that the generator breaker is in the test

position. If the breaker does not have a test position, rack the breaker out, remove the wire to the breaker-close coil and monitor voltage to the coil with a voltmeter.

Set synchronizing to MANUAL.

Bring the unit to synchronous speed and meet the conditions required for manual breaker closing (e.g., frequency, voltage, etc.).

Watch the synchroscope, synchronizing lights and indications on the synch-check relay. Verify the synch-check relay gives a breaker close permissive when the synchroscope is at 12 o‟clock and the synch lights are out.

Give a manual breaker close command when the synchroscope is at 12 o‟clock. Verify that the breaker closes in the test position or that voltage is indicated at the breaker close coil. If the breaker closes in the test position, verify proper indication of breaker close signal back to the controller.

Trip the generator breaker open.

Give a manual breaker close command when the synchroscope is at 6 o‟clock. Verify the breaker does not close or that voltage is not indicated at the breaker close coil.

Consult the turbine controller drawings and repeat the above steps for any variations on manual breaker closing, e.g., local, remote, etc.

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Generator Breaker Trip Circuit Checks

These checks are to verify the integrity of the applicable generator breaker trip commands. If possible, these checks should be done with the breaker racked out and in the test position. If the breaker does not have a test position, rack the breaker out, remove the wire to the breaker-trip coil and monitor voltage to the coil with a voltmeter.

Record data Check

Completed Completed by / date With the unit still running and the breaker in the

test position, close the breaker manually.

Consult the turbine controller drawings and test all possible combinations of the breaker trip circuit.

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Automatic Synchronizing Circuit

Before performing this check, ensure the phase rotation is correct and complete the manual synch checks.

Record data Check

Completed Completed by / date Verify that the generator breaker is in the test

position. If the breaker does not have a test position, rack the breaker out, remove the wire to the breaker-close coil and monitor voltage to the coil with a voltmeter.

Set synchronizing to MANUAL.

Bring the unit to synchronous speed and meet the conditions required for manual breaker closing (e.g., frequency, voltage, etc.).

Watch the synchroscope, synchronizing lights and indications on the synch-check relay. Verify the synch-check relay gives a breaker close permissive when the synchroscope is at 12 o‟clock and the synch lights are out.

Set synchronizing to AUTO. Verify the auto synchronizer gives a breaker close command and the synch-check relay gives a breaker close

permissive when the synchroscope is at 12 o‟clock and the synch lights are out.

Trip the generator breaker open.

Set synchronizing to OFF. Manually lower the generator terminal voltage to 95% of rated.

Manually lower generator speed to 99.5% of rated.

Set synchronizing to AUTO. Give the unit a start signal to reset the auto-synch permissive.

Verify autosynchronizer speed matching and voltage matching.

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Record data Check

Completed Completed by / date Trip the generator breaker by utilizing logic in the

turbine controller. Verify the breaker opens and speed setpoint goes to 100%. The breaker should not re-close.

Set generator synchronizing selector switch to OFF.

Consult the turbine controller drawings and repeat the above steps for any variations on automatic breaker closing, e.g., local, remote, etc.

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