Circuit Breaker Instrument

to parallel generators?
the three main conditions attached to parallel a generator to an existing running generator is the Voltage,cycles and Phase Synchronising.
Explain how you would by means of the instruments and controls at your disposal match the incoming generator to the generator on load and close the circuit breaker.
Explain what would happen if the breaker was closed when out of synchronising?
Here is the technique to parallel two 3 phase alternators.
1. The line voltage of each machine must be same. If not, then the rotational speed of one of the alternator must be altered to achieve same terminal voltage.
2. Both alternators must have the same phase sequence. If the phases are not in the same sequence, switching any pair of terminals will solve the problem. Phase sequence can be checked using light bulb method.
3. Ensure that there is no phase shift between the terminal voltages of any phase. This can also be done by the light bulb method. First change the frequency of any one of the alternator by altering the field current. This will make one of the alternators try to catch up with the other. When they catch up, the light bulbls will go dim, implying there is no phase angle difference between the phases. At that moment the alternators can be paralleled.
If you get it wrong, the protective circuit breakers will trip out.
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