Abstract:

The DC grounding faults exist in the outdoor equipments of 220kV and higher voltage grade substations inevitably. According to relevant examples,

the types of the grounding fault were summarized. The reasons of the grounding faults were analyzed. Aiming at the grounding faults, the improvement measures

were proposed; and the safe and stable operation of the equipments were ensured in practice.

Key words: DC grounding, auxiliary contact of isolating switch, temperature meter contact, solving measure