Page 187 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

Name plate details of alternator

Manufacturer : .............................. Serial number : ..............................

Type and model : ..............................
Type of connection : .............................. P.F. : ..............................

Rated voltage : .............................. Rated current : ........................amps
Frequency : .............................. Rated speed : .........................r.p.m.

Rated power : .............................. Rated exc. current : ............................amps

Rated exc. voltage : .............................. Direction of rotation : ..............................
Rating class : .............................. Protection class : ..............................
Insulation class : ..............................

Name plate details of DC shunt Motor
Name plate details
Manufacturer : .............................. Type of motor : ..............................

Serial No. : .............................. Insulation class : ..............................
Rated voltage : ..............................
Rated current : ..............................

Rated power : ..............................

TASK 2: Connect start and run the motor
1 Connect the circuit as per diagram in Fig1
2 Set the alternator on No load condition

3 Connect the instruments as per circuit diagram.
4 Connect the field winding of alternator as per diagram.
5 Connect the voltmeter to measure the alternator output voltage.
6 Connect the frequency meter in the circuit.
7 Switch on the ICDP switch.
8 Start the DC motor by 3-point starter.

9 Note the direction of rotation.

TASK 3: Set the voltage and frequency to rated value
1 Adjust the speed of DC shunt motor to set the frequency of alternator to rated value
2 Note the alternator output voltage.
3 Increase the field current gradually till alternator builds up rated voltage

4 Note field currents (I ) and generated voltage (E ) in Table 1
f g
5 Plot graph between E and I f
g

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CITS : Power - Electrician & Wireman - Exercise 77 CITS : Power - Electrician & Wireman - Exercise 77