What is direct loading test on single phase motor?
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What is the direct loading method to find out efficiency of transformer?
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Prasad Vasant Joshi, studied Electrical Engineering
Answered Dec 20, 2016 · Author has 485 answers and 1.8m answer views
Hello.
Direct loading test is one of the basic & easiest test to calculate efficiency & regulation of transformer.
Efficiency is ration of output power to the input power.
Regulation is defined as change in secondary terminal voltage from no load to full load (keeping primary terminal voltage & temperature constant)
Circuit Diagram: For 1Ph., 1KVA, 230/115V, 50Hz transformer

Procedure for conducting direct loading test:
Do connections as shown in circuit diagram.
Have lamp bank as loading system.
Note first readings of A, V, W without connecting any load across secondary of transformer.
Step by step increase the loading on transformer & note respective readings of ammeter, voltmeter & watt-meter, till full load condition.
Still have a question? Ask your own!
What is your question?
5 ANSWERS

Prasad Vasant Joshi, studied Electrical Engineering
Answered Dec 20, 2016 · Author has 485 answers and 1.8m answer views
Hello.
Direct loading test is one of the basic & easiest test to calculate efficiency & regulation of transformer.
Efficiency is ration of output power to the input power.
Regulation is defined as change in secondary terminal voltage from no load to full load (keeping primary terminal voltage & temperature constant)
Circuit Diagram: For 1Ph., 1KVA, 230/115V, 50Hz transformer

Procedure for conducting direct loading test:
Do connections as shown in circuit diagram.
Have lamp bank as loading system.
Note first readings of A, V, W without connecting any load across secondary of transformer.
Step by step increase the loading on transformer & note respective readings of ammeter, voltmeter & watt-meter, till full load condition.
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