EMERSON A6824R 9199-00098-13 Remote control module

EMERSON A6824R 9199-00098-13 Remote control module

During the no-load loss measurement, the r.m.s value of no-load current is also measured at the same time. For a three-phase transformer, the average of the three phase currents is taken. During the measurements the connections of the transformer shall be as foreseen in the service. The transformer could be magnetised by d.c. before performing the no-load test. Therefore, the transformer shall be supplied with a higher voltage during a suitable duration (a few minutes) for demagnetisation of the core then the measurement shall be made.

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Since the no-load currents are not symmetrical

generally not equal in magnitude. They have also different phase angles in three phases, so that the indications on the wattmeters will not be equal. The indication on one wattmeter can be zero ( 0 ) or even reach to ( - ) negative value. If the measurement are being made on delta connected windings, one of the current can be absolutely greater and the other two can be smaller and their magnitude approximately equal to each other. On star connected windings, the measured current on the middle phase can be smaller and the outer phase currents can be greater.

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