Page 193 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

TASK 3: Synchroscope method.
1 Draw the circuit diagram for conducting synchronization by synchroscope method.
2 Read and note the name plate details of alternators.

3 Switch on the supply and run the prime mover and alternator 1.
4 Switch ON and vary the DC excitation supply to build rated voltage of alternator and connect to busbar.
5 Switch on the supply and run the prime mover and incoming alternator (2).
6 Switch ON and vary the DC excitation supply to build rated voltage of alternator.

All connections should be tight and neat.
7 Check the phase sequence of the bus bar and incoming machine using phase sequence indicator.
8 Connect the phases of incoming machine in ICTP so as to match the phase sequence of busbar.
9 Adjust the voltage of incoming alternator to match that of busbar by varying excitation.
10 Adjust the frequency of incoming alternator to match that of busbar by varying speed of prime mover.
11 Check the needle position of synchroscope.

12 Adjust the speed of the incoming alternator by controlling the prime mover, so as to read zero in the
synchroscope.
13 When the needle of synchroscope is sTable at zero position, close the synchronizing switch.

Care should be taken while switching ON the supply at the exact zero position of the synchroscope.

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CITS : Power - Electrician & Wireman - Exercise 79