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Last updated: 24.07.2023
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SHORT CIRCUIT CURRENT TRANFORMATION from LV side to HV side

LV positive seqLV negative seqLV zero seqHV positive seqHV negative seqHV zero seqno transformationHV side currentsLV side currentsIaIbIcIa1Ib1Ic1IAIBICIA1IB1IC10

Functionality and Distinctive Features:

Description:

The phasor diagrams demonstrate the transformation of short-circuit currents from LV to HV side (e.g. 10 kV, 20 kV or 30 kV). The HV side neutral is isolated which is why there are no zero-sequence currents. The positive- and negative-sequence currents are transformed with phase shifts depending on the vector group. This leads to the fact that despite the voltage ratio of 1 the current values are different on both voltage sides. As transformer protection (overcurrent protection) pick-up values are based on HV currents, these current differences have to be taken into account.