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