Simulation Analysis for GIS Internal UHF Partial Discharge Signal Propagation Characteristics

This paper researches on the propagation characteristics of partial discharge in internal GIS. Through the external UHF sensor to receive the electromagnetic wave signals emitted from the surface of the insulator metal pouring hole flange and using the finite difference time domain method, by means of XFDTD modeling, simulation and analysis the propagation characteristics of partial discharge signals in GIS cavity. The result shows that the UHF partial discharge signal along the GIS cavity axis direction emitted from the metal flange pouring hole has the maximum electric field component; electric field strength modulus value in the center is greater than the modulus of both sides, and both sides are symmetrical distribution; the direction of the magnetic field is parallel to long edge and the strength of magnetic field modulus value in the short- side is greater than the midline of long side.