Earth Mat Design Ppt

Earthing mat design for hv ehv substations.

Earth mat design ppt.

Increase in no of down rod reduces step potential. Design procedure of earth mat increase in horizontal conductor length actually reduces touch potential. The wenner and schlumberger test methods are both recommended with testing and interpretation. Earthing mat is made by joining the number of rods through copper conductors.

Introduction to substation earthing grid. Driven chemical electrolytic ground rod. Chemical electrolytic ground electrodes provide a low grounding resistance in areas of high soil resistivity and low. Use of e mix a conductive earthing compound with earth mats will always improve the earth resistance.

Increase in no of mesh in mat reduces the touch potential but beyond certain limit the mat is said to be saturated. Standard crowfoot earth 25mm x 3mm copper tape x 5m long joined to a 70mm2 bcew tail 2m long. Could u please explain me how to do the earth mat design for 220 132 33 kv outdoor gss which have 5 steps 135m 138m 141m 144m 147m. Can t do the earth mat design separately for each step and finally connect each steps together.

While designing an earth mat the following step is taken. Read about design of substation earthing system here. Earth mat design for 132kv substation in rivers state using etap pdf. Content uploaded by omeje crescent onyebuchi.

It is well that the earthing systems are intended to protect equipment and personnel in and around the substation from the dangerous over voltage. Earth mat design for 132kv substation in rivers state using etap pdf. It reduced the overall grounding resistance. The grounding system in substation is very important.

Auxiliary rectangular wire mats. Introduction earthing is essential wherever electricity is generated transmitted and distributed or user to ensure safety and proper operation of the electrical system. The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors. So we have to effectively use conductor and down rod to minimize the step and touch potential within mat zone and beyond of.

Earthing mat is mostly used in a placed where the large fault current is to be experienced. In this design these additional rods or mats are made to bond with the existing main ground mat and thereby assist in achieving the desired results.