Synchronizing and loading

Synchronizing

The synchronization can be performed manually or automatically. If automatic synchronization is selected, the control system takes care of the complete synchronization sequence.

Manual synchronization is performed from the synchronizing control unit.

1.0  Select the breaker to be synchronized.

A generator breaker is selected by turning the "synchronising" switch on the manual control unit.

• A common circuit breaker is selected with the corresponding button in the mimic diagram on the common control panel.

2.0  Adjust the generator frequency to be as near the reference frequency as possible.

•  Follow the readings on the frequency meters.

3.0  Adjust the generator voltage to be as near the reference voltage as possible.

•  Follow the readings on the voltage meters.

4.0 Check the synchronoscope indication. The synchronoscope indication should rotate slowly clockwise, indicating that the generator frequency is slightly higher than the reference frequency. Adjust the frequency as required.

•  If the indication rotates quickly clockwise, the generator frequency is too high.

•  If the indication rotates anticlockwise, the generator frequency is too low.

When all synchronization conditions are fulfilled, a green LED at the top of the synchronoscope is illuminated.

5.0 Give a close order to the circuit breaker slightly before the synchronoscope indication reaches the top of the display.

 

Loading the generating set

Note!

In automatic mode, the generating set is automatically loaded (according to the settings entered by the operator at the WOIS workstation), once the generator breaker is closed.

Note!

In island operation, the load of the generating set is determined by the system load. To control the load sharing, the operator can adjust the speed reference and the voltage reference of the generating set.

Provided that the engine is properly preheated, it can be loaded immediately after the start. To prolong the lifetime of engine components, the load should be applied gradually.

1 Check that the generator breaker is closed.

2 Check that the "generating set control" selector switch on the manual control unit is in position "manual".

3 Check that the engine and generator control mode selector switches are in the correct positions.

4 Adjust the active power of the generating set with the "fuel decrease - increase" switch.

5 Adjust the reactive power of the generating set with the "excitation decrease - increase" switch.

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