Research on the application of the frequency-phase controlled AC withstand technology in GIS

Abstract

Gas insulated SWITCHGEAR has been widely used in modern power grid with increasingly tight land use due to its advantages such as small floor space, high integration, strong security, high reliability and small maintenance workload. For the extended high-voltage GIS equipment, field insulation AC voltage withstand test must be carried out before operation to verify whether the equipment is ready for operation. In the withstand voltage test, considering the possible breakdown of the original equipment during the withstand voltage between the tested, the original equipment must be cut off and grounded. However, with the continuous improvement of the reliability requirements of power supply, the power failure will cause great economic and political losses, which requires a technology that does not require the GIS bus to stop completely, namely frequency-phase controlled AC withstand test technology. In this paper, the test principle of the frequency-phase controlled AC withstand test technology is first analyzed, and then the test process of the frequency-phase controlled AC withstand technology is illustrated by an example, which provides a reliable scheme for the field test of GIS maintenance or expansion interval.