Exploring the Test Plan for the Impact of VFTO on Localized Protection Devices

The State Grid Corporation of China is steadily promoting the research and trial operation of localized protection devices, and the very fast transient overvoltage (VFTO) nuisance caused by disconnecting switch operation in GIS may affect the normal operation of localized protection devices, which will threaten the safe operation of GIS substations and even the whole power system once an accident occurs. This paper introduces the characteristics of localized protection devices, summarizes the EMC test methods of localized relay protection laboratory, sorts out the categories of VFTO harassment on localized protection devices. It proposes the test methods of VFTO impact on localized protection devices by combining the functions of VFTO electromagnetic transient test platform, so as to lay the foundation for the subsequent testing and evaluation of VFTO impact on localized protection devices.