On-site standard lightning impulse test for 1,100-kV gas-insulated switchgear with large capacitance

Abstract

Gas-insulated metal-enclosed switchgear (GIS) was developed in the mid-1960s [1]–[5]. Compared with traditional air-insulated switchgear, the GIS concentrates the bus, isolating switch, circuit breaker, lightning arrester, transformer, and many other devices in an enclosed grounding metal case. It has many advantages such as reliability, compactness, long maintenance cycle, and low environmental impact, which have led to it being widely used in electrical power systems [6]–[16]. However, increased operating voltages and more extensive power grids have given rise to increased GIS failure rates [17], [18].