Abstract
In order to evaluate the insulation condition of gas insulated switchgear (GIS) by using the ultra-high frequency (UHF) method, attempt to estimate PD current using the finite difference time domain (FDTD) method was carried out. The influence of PD current parameters and the position of measuring point on the received electromagnetic (EM) waves was studied. The EM waves received by using UHF sensors were also simulated by applying a band pass filter to the received signals. Results showed that peak-to-peak value of electric field strength of EM waves was closely related to the peak value and rise time of PD current. The relationship between the peak-to-peak value of electric field strength and the position of measuring point was investigated and the estimation procedure of PD current was proposed.
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