Page 196 - CITS - Electrician - Trade Practical
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ELECTRICIAN - CITS
TASK 3: Plot the open circuit charactered by varring voltage
1 Adjust the DC excitation voltage to zero.
2 Connect the DC excitation supply to the exciting coil of the alternator.
3 Vary the excitation field current (If) gradually.
4 Record different excitation currents and corresponding generated emf (Eg) of the alternator.
5 Plot field current (If) along X axis
6 Plot generated emf (Eg) along Y axis.
7 Plot the Open circuit characteristics from the recorded readings.
TASK 4: Lead the alternator with lamp and record readings
1 Run the alternator with lamp load at rated speed and generate rated voltage
2 Load alternator gradually with lamp load and note VT and IL (Terminal voltage and Load current)
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CITS : Power - Electrician & Wireman - Exercise 80
