ELAU PMC-2/11/08/000/00/03/11/00/0K Power card

ELAU PMC-2/11/08/000/00/03/11/00/0K Power card

Since the circuit is entirely inductive in large power transformers and reactors the power factor of the system (cos ϕ) would be very small. (Cos ϕ = 0,015…0,003 or 90 - ϕ = 1°…. 10 min.), the measurement errors arising from measurement transformers will be comparatively high. In such cases the results of the measurements must be corrected by a correction factor.Since, phase displacement errors in measurement transformers are given in minutes.

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MEASUREMENT OF NO-LOAD LOSSES 

The no-load test is performed when one of the windings is unconnected to power supply (usually the H.V. winding) while the other winding is supplied with rated voltage at rated frequency. Then the no-load losses ( P0 ) and the no-load current ( I0 ) are measured. The test is usually carried out between 90 % - 115 % of UN voltage at equal interval and corresponding values to the rated voltages are determined.

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