Design of Grounding System for Substation

This paper presents 230 66 kV, substation grounding system and calculation results of required parameters. The grounding system is essential to protect people working or walking in the vicinity of earthed facilities and equipments against the danger of electric shock. This paper provides the floor surface either assures an effective insulation from earth potential or effectively equipment to a close mesh grid. Calculations of grounding grid system in the substation area which the top soil layer resistivity is less than the bottom layer resistivity, can lessen the number of ground rod used in the grid because the value of Ground Potential Rise GPR is insignificantly different. Essential equations are used in the design of grounding system to get desired parameters such as touch and step voltage criteria for safety, earth resistance, grid resistance, maximum grid current, minimum conductor size and electrode size, maximum fault current level and resistivity of soil. Calculations of three separate earthing body earth, neutral earth and main earthing are described. Zin Wah Aung | Aung Thike "Design of Grounding System for Substation" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26641.pdfPaper URL: https://www.ijtsrd.com/engineering/electrical-engineering/26641/design-of-grounding-system-for-substation/zin-wah-aung