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Monday, April 4, 2011

OPEN CIRCUIT CHARACTERISTICS OF SEPARATELY EXCITED DC SHUNT GENERATOR


OPEN CIRCUIT CHARACTERISTICS OF SEPARATELY EXCITED
DC SHUNT GENERATOR

AIM:
To obtain open circuit characteristics of separately excited DC shunt generator.

APPARATUS REQUIRED:
S.No.
Apparatus
Range
Type
Quantity
1
Ammeter
(0-1)A
MC
1
2
Voltmeter
(0-300)V
MC
1
3
Rheostats
1250W, 0.8A
Wire Wound
2
4
Tachometer
(0-1500)rpm
Digital
1
5
Connecting Wires
2.5sq.mm.
Copper
Few

PRECAUTIONS:
1.    The field rheostat of motor should be in minimum resistance position at the time of starting and stopping the machine.
2.    The field rheostat of generator should be in maximum resistance position at the time of starting and stopping the machine.







PROCEDURE:
1.    Connections are made as per the circuit diagram.
2.    After checking minimum position of motor field rheostat, maximum position of generator field rheostat, DPST switch is closed and starting resistance is gradually removed.
3.    By adjusting the field rheostat, the motor is brought to rated speed.
4.    By varying the generator field rheostat, voltmeter and ammeter readings are taken.
5.    After bringing the generator rheostat to maximum position, field rheostat of motor to minimum position, DPST switch is opened.




TABULAR COLUMN:
S.No.
Field Current
If (Amps)
Armature Voltage
Eo (Volts)














MODEL GRAPH:


Text Box: Eo (Volts)








If (Amps)
 



RESULT:
Thus open circuit characteristics of separately excited DC shunt generator is obtained.



AIM:
To obtain open circuit characteristics of separately excited DC shunt generator.

APPARATUS REQUIRED:
S.No.
Apparatus
Range
Type
Quantity
1
Ammeter
(0-1)A
MC
1
2
Voltmeter
(0-300)V
MC
1
3
Rheostats
1250W, 0.8A
Wire Wound
2
4
Tachometer
(0-1500)rpm
Digital
1
5
Connecting Wires
2.5sq.mm.
Copper
Few

PRECAUTIONS:
1.    The field rheostat of motor should be in minimum resistance position at the time of starting and stopping the machine.
2.    The field rheostat of generator should be in maximum resistance position at the time of starting and stopping the machine.







PROCEDURE:
1.    Connections are made as per the circuit diagram.
2.    After checking minimum position of motor field rheostat, maximum position of generator field rheostat, DPST switch is closed and starting resistance is gradually removed.
3.    By adjusting the field rheostat, the motor is brought to rated speed.
4.    By varying the generator field rheostat, voltmeter and ammeter readings are taken.
5.    After bringing the generator rheostat to maximum position, field rheostat of motor to minimum position, DPST switch is opened.




TABULAR COLUMN:
S.No.
Field Current
If (Amps)
Armature Voltage
Eo (Volts)














MODEL GRAPH:


Text Box: Eo (Volts)








If (Amps)
 



RESULT:
Thus open circuit characteristics of separately excited DC shunt generator is obtained.

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