Transformer sub-station for controlling auto-protective transformer, has medium voltage equipment having earthing switch that can only be controlled if function of supply lines of bar of principal circuit are open or connected to earth

摘要

Transformer sub-station has a transformer (5), and a medium voltage equipment (4). Medium voltage equipment includes earthing switch (18), connecting bars of principal circuit (10) to earth, that can only be controlled if the function of supply lines of the bar are open or connected to earth. Transformer is connected to bars of principal circuit using plug-in connector (19).