uring the open circuit test of a transformer*The secondary is supplied rated KVAPrimary is supplied with no-load currentPrimary is supplied current at high voltage.Primary is supplied rated voltage
Question
uring the open circuit test of a transformer*The secondary is supplied rated KVAPrimary is supplied with no-load currentPrimary is supplied current at high voltage.Primary is supplied rated voltage
Solution
During the open circuit test of a transformer, the primary is supplied with rated voltage. This test is performed to determine the core loss or iron loss and no-load current, which is used to calculate the no-load parameters of the equivalent circuit of a transformer.
Here are the steps:
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The secondary winding of the transformer is left open, meaning it's not connected to any load.
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The primary winding is connected to its rated voltage.
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The voltmeter, ammeter, and wattmeter are connected to the primary winding.
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The readings of the voltmeter, ammeter, and wattmeter are noted. The voltmeter measures the primary voltage (which should be the rated voltage), the ammeter measures the no-load current, and the wattmeter measures the iron loss of the transformer.
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The no-load current and iron loss are then used to calculate the no-load parameters of the equivalent circuit of the transformer.
Note: The secondary is not supplied with rated KVA, and the primary is not supplied with high voltage or no-load current. The primary is supplied with rated voltage.
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