30-10-2012, 05:52 PM
SEPARATION OF NO LOAD LOSSES IN A SINGLE PHASE TRANSFORMER
SEPARATION OF NO LOAD LOSSES IN A SINGLE PHASE TRANSFORMER.docx (Size: 61.51 KB / Downloads: 21)
PRECAUTIONS:
1. The motor field rheostat should be kept at minimum resistance position.
2. The alternator field rheostat should be kept at maximum resistance position.
PROCEDURE:
1. Connections are given as per the circuit diagram.
2. Supply is given by closing the DPST switch.
3. The DC motor is started by using the 3 point starter and brought to rated speed by adjusting its field rheostat.
4. By varying the alternator filed rheostat gradually the rated primary voltage is applied to the transformer.
5. The frequency is varied by varying the motor field rheostat and the readings of frequency are noted and the speed is also measured by using the tachometer.
6. The above procedure is repeated for different frequencies and the readings are tabulated.
7. The motor is switched off by opening the DPST switch after bringing all the rheostats to the initial position.