Measurement of radiated electric field caused by VFTO of UHV GIS circuit breaker

The radiation electric fields caused by the switching of 1100kV and 550kV GIS circuit breakers are measured by optical fiber measuring system. The waveform characteristics of radiation field and the frequency range are analyzed in this paper. The results show that the radiation field amplitude of 1100kVGIS circuit breaker actions can be up to 0.78kV/m, and the amplitude of radiation filed by 550kVGIS breaker produces can be up to 0.13kV/m. The frequency range of 1100kV GIS is from 20MHz to 100MHz, which is higher than the frequency range 0–5MHz of 550kV GIS. In addition, different types of tests can affect the frequency of electric field pulses, leading to different pulse polarity characteristics.