High Voltage Faults Conditions of In-House Loads of a Power Station

Open circuit conditions which are not trivial to accurately locate can be detrimental to the operation of auxiliary equipment and in-house loads of a power station. Previously, the behaviour of the sections of auxiliary equipment and in-house loads, supplied through main and backup transformers, under influence of such faults on buses 220, 24 and 6 kV was studied. Thus, the purpose of this paper is to study these faults on 400 kV. Albeit the observed voltages' and currents' deformations and imbalances, selectivity of protection devices is not violated.