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Monday, April 4, 2011

LOAD CHARACTERISTICS OF DC COMPOUND GENERATOR


LOAD CHARACTERISTICS OF DC COMPOUND GENERATOR

AIM:
To obtain the load characteristics of DC Compound generator under cumulative and differential mode condition.

APPARATUS REQUIRED:
S.No.
Apparatus
Range
Type
Quantity
1
Ammeter
(0-2)A
(0-20) A
MC
MC
1
1
2
Voltmeter
(0-300)V
MC
1
3
Rheostats
1200W, 0.8A
Wire Wound
2
4
Loading Rheostat
5KW, 230V
-
1
5
Tachometer
(0-1500)rpm
Digital
1
6
Connecting Wires
2.5sq.mm.
Copper
Few

PRECAUTIONS:
1.    The field rheostat of motor should be at minimum position.
2.    The field rheostat of generator should be at maximum position.
3.    No load should be connected to generator at the time of starting and stopping.




PROCEDURE:
1.    Connections are made as per the circuit diagram.
2.    After checking minimum position of DC shunt motor field rheostat and maximum position of DC shunt generator field rheostat, DPST switch is closed and starting resistance is gradually removed.
3.    Under no load condition, Ammeter and Voltmeter readings are noted, after bringing the voltage to rated voltage by adjusting the field rheostat of generator.
4.    Load is varied gradually and for each load, voltmeter and ammeter readings are noted.
5.    Then the generator is unloaded and the field rheostat of DC shunt generator is brought to maximum position and the field rheostat of DC shunt motor to minimum position, DPST switch is opened.

6.    The connections of series field windings are reversed the above steps are repeated.
7.    The values of voltage for the particular currents are compared and then the differential and cumulative compounded DC generator is concluded accordingly.




TABULAR COLUMN:
S.No.
Cumulatively Compounded
Differentially  Compounded
V (Volts)
IL (Amps)
V (Volts)
IL (Amps)




















MODEL GRAPH:



                                   










RESULT:
Thus load characteristics of DC compound generator under cumulative and differential mode condition are obtained

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