Measurement of Losses in Shunt Reactor

The losses of a shunt reactor should be measured at rated voltage and frequency. But for very high voltage shunt reactor, it may be difficult to arrange so high test voltage during measurement of losses. This difficulty can be overcome, by measuring the losses of the shunt reactor at any voltage lower than the system voltage of the reactor. Then this measured loss is multiplied by the square of the ratio of rated current to the current of the reactor at applied reduced test voltage to obtain the loss at rated voltage.

As the power factor of the shunt reactor is very low, loss measurement of shunt reactor by conventional wattmeter is not very reliable, instead bridge method of measurement may be adopted for better accuracy.

The losses in various parts of the reactor cannot be segregated by this test. In order to avoid correction of test result for reference temperature, it is preferable to take the measurement when average temperature of the winding becomes equal to the reference temperature.

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