Page 192 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

TASK 2: Bright lamp method
1 Make the connections as per the circuit diagram for bright lamp method. Fig 2

2 Switch on the supply and run the prime mover and alternator.
3 Switch ON and vary the DC excitation supply to build rated voltage of alternator.
4 Check the phase sequence of the bus bar and incoming machine using phase sequence indicator.
5 Connect the phases of incoming machine in ICTP so as to match the phase sequence of busbar.

6 Adjust the voltage of incoming alternator to match that of busbar by varying excitation.
7 Adjust the frequency of incoming alternator to match that of busbar by varying speed of prime mover.
8 Vary the prime mover to get the dark condition of the lamp connected directly between two phases and to get
the equally dim condition of lamps interposed between two phases.

9 Close the synchronizing switch when the condition at above step is met.

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CITS : Power - Electrician & Wireman - Exercise 79