ELAU PMC-2/11/05/000/00/00/01/00/00 Communication card

ELAU PMC-2/11/05/000/00/00/01/00/00 Communication card

Short-circuit (load) losses and short-circuit impedance voltage are guaranteed and reported values by the manufacturer to customers. Short-circuit impedance voltage is an important parameter specially for the parallel operation of the transformers, where as short-circuit losses are important from economical point of view. This measurement is carried out to determine the load losses of the transformer and the impedance voltage at the rated frequency and rated current. The measurements are made separately for each winding (e.g. between 1st winding and 2nd winding for a two winding transformer; and between 1st and 2nd, between 1st and 3rd and between 2nd and 3rd winding for a three-winding transformer). If the tapping range is more than 5%, the measurements are repeated on the extreme tapping also.

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Rated current is generally applied to the H.V. 

winding while L.V. winding is short-circuited. Test current should be close to the value of IN rated current as much as possible. And the voltage waveform should be in sinus-form with rated frequency. The voltage, current and load losses for each phase should be measured during the test. In case that the generator could not supply the system, the reactive power is encountered by using the capacitor banks. The readings have to be taken as quickly as possible to prevent the temperature changes in the windings and the applied current should be between 25 %…… to 100 % of rated current. So that the measurement errors are minimized.

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