Hazards, causes, and types of multi-point ground faults in transformer core
Hazards of Multi-Point Grounding Faults in Transformer CoresDuring normal operation, transformer cores must not be grounded at multiple points. The windings of an operating transformer are surrounded by an alternating magnetic field. Due to electromagnetic induction, stray capacitances exist between the high-voltage and low-voltage windings, between the low-voltage winding and the core, and between the core and the tank.The energized windings couple through these stray capacitances, causing the