Page 104 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

TASK 3 : Calculate the efficiency of transformer
1 Record all the readings in the tabular column.
2 Calculate primary input power as per readings recorded by voltmeter & ammeter on primary side of transformer.
3 Similarly, calculate secondary output power as per readings recorded by voltmeter & ammeter on secondary
side of transformer.
4 Compare both calculations with primary & secondary watt meter (W1 & W2) readings.
5 Record the total losses of transformer (WT) determined by previous experiment OC & SC test of transformer.
6 Now, calculate the efficiency of transformer by the formula

Tabular column

Load Primary Secondary

Voltage Current Watts Voltage Current Watts Power Total Efficiency
(VP) (IP) (WP) (VS) (IS) (WS) factor Losses of T/f
(WT)
25%

50%

75%

100%

87

CITS : Power - Electrician & Wireman - Exercise 43