Study on Optimization and Application of 500kV HGIS Layout

In the background of HGIS(Hybrid Gas Insulated Switchgear) gradually replacing outdoor GIS(Gas Insulated Switchgear) and AIS(Air Insulated Switchgear) as the mainstream equipment type for high-voltage substations in China, 500kV HGIS substation with one and a half circuit breaker wiring arrangement has the problem of a large power outage range during expansion and maintenance. In order to solve the problem, we analyze the entire lifecycle, with a focus on differences in equipment type and cost and construction flexibility, site area, and the impact on expansion and maintenance of the three layout plans of in-line type HGIS. And we recommend the circuit breaker separation layout plan which has better construction flexibility and larger operation and maintenance space. Moreover the circuit breaker separation layout plan can significantly reduce the outage time and losses which is of great significance for the safe and stable operation of the power grid and national production and life.