LOAD TEST ON THREE PHASE ALTERNATOR

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AIM
To conduct the load test on single phase alternator.
APPARATUS REQUIRED
PRECAUTION
1. The motor field rheostat should be kept in the minimum resistance position.
2. The alternator field potential divider should be in the minimum voltage position.
3. Initially all switches are in open position.
PROCEDURE
1. Note down the name plate details of motor and alternator
2. Connections are given as per circuit diagram.
3. The DPST is closed on supply side.
4. Using three point starter, the motor is started. The alternator is brought to Rated speed by varying motor field rheostat.
5. By varying the alternator field potential divider in steps up to the rated alternator terminal voltage.
6. Close the DPST switch on alternator terminal side, then by step and apply load up to the rated current.
7. Note down corresponding reading of voltmeter, ammeter and field current noted and plot the graph.