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dc.contributor.authorA. Puttarachen_US
dc.contributor.authorN. Chakpitaken_US
dc.contributor.authorT. Kasirawaten_US
dc.contributor.authorC. Pongsriwaten_US
dc.description.abstractThis paper presents a substation grounding grid analysis with the variation of soil layer depth. The grounding grid system of a practical 22 kV substation, in which the ground grid is made from copper, is calculated by virtue of the CDEGS software. The study, supported by Provincial Electricity Authority (PEA), Thailand, is based on grounding grid system of Royal Flora RATCHAPHRUEK substation. The supporting soil resistivity data has been obtained from field tests at the substationThe result shows that soil resistivity was interpreted to two-layer soil structure with low resistivity top layer and high resistivity bottom layer. The studied ground grid system is installed with constant 3m ground rods. When the ground layer depth of the grid is increased, it directly affects to reduce the value of Ground Potential Rise (GPR). On the other hand, with the same grid configuration buried in the high resistivities bottom layer, its GPR is not reduced, that is, the more layer depth of high resistivities bottom layer, the more value of GPR. In addition, the grid with the different ground rods length also gives the different results. GPR is continuously reduced when the rod length is lengthened even though the bottom layer resistivity is higher than the top layer. ©2007 IEEE.en_US
dc.titleGround layer depth and the effect of GPRen_US
dc.typeConference Proceedingen_US
article.title.sourcetitleIEEE PES PowerAfrica 2007 Conference and Exposition, PowerAfricaen_US Mai Universityen_US
Appears in Collections:CMUL: Journal Articles

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