22-12-2012, 03:07 PM
OPEN CIRCUIT & LOAD CHARACTERISTICS SELF EXCITED D.C. SHUNT GENERATOR
OPEN CIRCUIT and LOAD CHARACTERISTICS SELF EXCITED.docx (Size: 14.93 KB / Downloads: 35)
PROCEDURE
The connections are made as per the circuit diagram.
The DPST switch is closed.
The motor is started using three point starter.
By varying the field rheostat of the motor, the speed of the motor, is adjusted to the rated speed of the generator.
The initial voltage due to residual magnetism in noted & The SPST switch should be closed.
The field rheostat of the generator is varied in steps.
In each step the ammeter and voltmeter readings are noted.
PRECAUTION
All the switches are kept open initially.
The motor field rheostat is kept at minimum resistance position.
The generator field rheostat is kept at maximum resistance position.
The SPST should be kept open at the time of starting to find the residual voltage.