ELTEX KNH34 CPU card

ELTEX KNH34 CPU card

No-Load Losses and No

-Load Current The following losses occur at no-load 

- Iron losses in the transformer core and other metal parts

- Dielectric losses in the insulation’s 

- Load losses caused by the no

-load current Since the last two mentioned losses are relatively very low, they can be ignored. So that the no-load losses are only the iron losses.

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THE TESTING OF POWER TRANSFORMERS

Because the losses are to be determined under standard conditions, it is necessary to apply a wave shape correction whereby the losses are corrected to correspond to test conditions where the supply voltage is sinusoidal. In case of non-uniform waveform, the effective value of voltage ( U ) is different than the mean value ( U’ ). There is no need for correction, if the voltmeter readings are the same for all. The test voltage wave shape is satisfactory if the difference between readings U’ and U are less than 3 %. The test voltage ( U’ ) is adjusted by the “mean value” voltmeter. Then the hysterisis losses can be measured correctly. But the Eddy-current losses should be corrected.

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