Page 109 - CITS - Electrician - Trade Practical
P. 109

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.







                                                           92

                                    CITS : Power - Electrician & Wireman - Exercise 45
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