Generator Synchronization System - E Tips BD

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Monday, June 17, 2019

Generator Synchronization System

Generator Synchronization System
A control system need for generates analogue signal and send to the engine governor and Voltage regulator (AVR) for adjust generator frequency and voltage. Speeds/Voltages up or slow down the generator set until the frequency and voltage of the incoming generator are “matched” or the same as the bus voltage and frequency. When frequency and voltage are matched within duration (define) the synchronizer issues a “breaker close command” (relay energized).

Synchronizer is a device or arrangement that interfaces with generator control and deal synchronization system to a generator.

The generators are synchronized when the following conditions are set:
1. Equal terminal voltages. This is obtained by adjustment of the incoming generator’s field strength (By AVR).
2. Equal frequency. This is obtained by adjustment of the incoming generator’s prime-mover speed (By Governor/Speed Controller).
3. The phase of the voltage of the incoming generator’s must be identical with the phase of the bus bar voltage with respect to the external circuit.
4. Phase voltages in proper phase relation.  the phase voltages of the incoming generator’s  and the bus-bar should be same. (Need to checked by the phasing out test during the commissioning of the a generator’s )

With the help of Synchronoscope we can identify the difference of generator voltage and frequency with busbar. When voltage and frequency same busbar the Synchronoscope pointer show top (0 degree) and Syn Lamp show darkest. This position/condition generator ACB will close.

ACB= Air Circuit Breaker
AVR= Automatic Voltage Regulator
Engine Governor= Speed Controller
PLC= Programmable Logic Controller

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