A. core loss
B. copper loss
D. magnetising current and loss
A no-load test is performed on a transformer to determine
A. core loss
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A no-load test is an important diagnostic tool used to determine the core losses and parameters of the shunt branch of the equivalent circuit of a transformer. The test involves applying the rated voltage from the primary side, while the secondary side is kept in a no-load state.
This allows the current to flow only to the magnetizing current and losses, giving a measurement of the no-load impedance in the excitation arm of 10kV and above transformers.
The results of this test are used to calculate the core loss and no load current, as well as provide insight into the efficiency and copper losses associated with the transformer.