The test is conducted at low voltage because if the applied electrical engineering by theraja pdf was normal voltage then the current through the stator windings would be high enough to overheat the windings and damage them. IEEE, because the rotor’s effective resistance at low frequency may differ at high frequency.
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The test can be repeated for different values of voltage to ensure the values obtained are consistent. As the current through the stator may exceed the rated current, the test should be conducted quickly. By using the parameters found by this test, the motor circle diagram can be constructed. Electronic Systems of Wisconsin, Inc.
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