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This paper shows a case study of a partial discharge (PD) test in a 230kV/2000A circuit breaker that was performed in a substation. Two sorts of sensors were used: a high frequency current transformer (HFCT) installed in equipment's grounding conductor and an antenna that is used to estimate the location of discharge source. Partial discharge signatures obtained previously at the laboratory were used...
With more and more HVDC transmission projects built and becoming operational, more issues are emerging. The increasing scarcity of land resources narrows down the choice of sites for ground electrodes and makes site selection ever difficult. Studies on the deep well grounding technique show that the currents flowing into the earth can be brought far below the surface and the line corridor and land...
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