Page 109 - CITS - Electrician - Trade Practical
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ELECTRICIAN - CITS
7 Note down the voltmeter and ammeter readings on primary & secondary side of transformer.
8 Apply the lamp load on secondary of transformer and increase step by step up to the rated load current of
transformer.
9 Take all meter readings and record in the tabular column, decrease the load.
10 Reduce the voltage in Auto transformer, switch OFF the mains and disconnect the transformer.
Tabular column:
Primary side of T/f Secondary side of T/f
Connection Line voltage Line current Connection Line voltage Line current
(VL) (IL) (VL) (IL)
STAR DELTA
Safety precautions:
1 Identify and mark primary & secondary terminals correctly.
2 Ensure correct sequence of connection of STAR & DELTA.
3 Ensure proper earthing for transformer and equipments.
4 Be cautious of high voltage and do not touch open terminals.
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CITS : Power - Electrician & Wireman - Exercise 45
