Page 107 - CITS - Electrician - Trade Practical
P. 107
ELECTRICIAN - CITS
TASK 2 : Connecting and loading of transformer
1 After proper placing of transformers and fulfilling conditions as per step 1, perform the parallel connection of
transformers.
2 Make the connection of transformers as per the circuit diagram.
3 Switch ON the supply and record the primary and secondary voltages.
4 Apply the load step by step up to the full load current of transformers.
5 Note down the voltage and current readings and record in tabular column.
6 Verify that load current of both transformers are same, and load is shared by two transformers.
7 Switch OFF the supply and disconnect the circuit & transformers.
Tabular column
Primary Bus Primary Bus Secondary T/f -1 load T/f -2 load Total load
Voltage (VP) Current (IP) voltage (VS) current (I1) current (I2) current (IL)
400 V 230 V
Note: With above readings it is observed that, load current is equally shared by two transformers
Connected in parallel.
Safety precautions:
1 Do not make wrong and loose connections.
2 The conditions for parallel operation of transformer should be fulfilled
3 Do not load the transformers excessively.
4 Take the meters reading correctly.
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CITS : Power - Electrician & Wireman - Exercise 44