Evaluation of lightning and grounding system design in high voltage substation / Zulhisham Mat Zain

Substation is a part of component that grants the successful of operation in power system. In general, it can be considered as heart of overall power system. Well-designed grounding plays an important role in every substation. As lightning strike on transmission tower, the high current should be directed to ground in proper manner. Thus, grounding system has to be design with safe as it is especially concerned with safety of persons working within the substation, equipment's and it surrounding with hazardous of step and touch voltage. The main purpose of this paper is designing safe grounding systems with cost effective for HV (High Voltage) substations situated at such locations where soil of the substation site is not uniform. Next, two case study have been solved by using computer program package CDEGS (Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis), Auto grid Pro and results obtained here are compared with manual calculation. Possible design improvements are introduced and compared for their effectiveness from safety and cost efficiency perspectives.