131#SEASONAL INFLUENCES ON SAFETY OF SUBSTATION GROUNDING SYSTEMS

ABSTRACT

The low or high resistivity soil layer formed in raining or freezing season affects the safety of grounding system, and leads the changes of grounding resistance of the grounding system, step and touch voltages on the ground surface. This paper systematically discusses the seasonal influence on the safety of grounding system and the different methods to be adopted inorder to nullify the effect of seasonal changes.

Inorder to nullify the effect of the seasonal changes we can use long vertical grounding electrodes or by using chemically charged ground electrodes (CCGR) with or without backfill which can effectively attenuate the seasonal influence and improve the safety of the grounding system.