Study on the Spatial Radiation EMI Characteristics of GIS Caused by Disconnector Operation

GIS switchgear operation is the main EMI source of the smart substation which will disturb the normal work of intelligent component and results severe electric power accident. To ensure the safety and reliability of smart GIS substation, it is quite necessary to carry out research on the EMI characteristics of GIS spatial radiation caused by disconnector operation. For this reason, a 550kV GIS experimental platform with very complex measurement system is set up and biconical antenna is applied to measure the electric filed radiation during the test. The measurement results show that: ① The amplitude of electric filed radiation is very high, which fluctuates at the range of 1.931kV/m~2.458kV/m; ② The EMI duration of DS operation last for long time, 5-7 cycle time for open operation and 3-5 cycle time for close operation respectively; ③The electric filed radiation has abundant frequency component and 1MHz,7.5MHz,14.5MHz and 46.5MHz are the characteristic frequency of it.