What are the advantages and disadvantages of short circuit and open circuit test?

In case of open circuit lest, the power required is equal to the iron loss whereas, for a short-circuit test, the power required is equal to full-load copper loss. (ii) These tests enable us to determine the efficiency of the transformer accurately at any load and p.f. without actually loading the transformer.

What is the advantage of Sumpner’s test over open circuit and short circuit tests?

The Sumpner’s test(back to back test) is the very practical, convenient, efficient and minimum power consumption without actual loading(heat run(Temp. rise) test for Hrs.) method to find regulation and efficiency of large power transformer, used in practice.

What are the advantages and disadvantages of direct loading test method of transformer?

1) It’s not economical to do this test on large rating machines as, just for the sake of test you can’t waste large amount energy. 3) It’s a difficult task arrange different kinds for load (R,L,C) from no load to full load to study performance at different situations.

What are the advantages and disadvantages of direct load test for 3 phase induction motor?

1) The power factor of the motor is very low during the light load condition. 2) The three-phase induction motor is constant speed motor. The change in speed of the motor is very low during different loading conditions.

What are the disadvantages of Sumpners test?

Draw the experimental set up or the Sumpners test on 1 phase transformer. If large transformer are to be tested for determining their efficiency, temperature rise and regulation then a load of high capacity, may not be available and if available, the energy consumed in testing will be wasted.

What are the advantages of open circuit?

1. load test gives accurate results due to actual loading of transformer,whereas in open circuit test we neglect cu losses and in short circuit test we neglect core losses,so readings are not accurate. 2. we can’t predetermine the efficiency and regulation by loading test,which can be obtained by o.c. and s.c. test.

What are the disadvantages of Sumpner’s test?

Only Disadvantages of Transformer Sumpner’s Test is that two identical transformers are required.