Simulation on the Propagation of the Optical Signal of Partial Discharge in T-shaped GIS Model

In order to study the propagation characteristics of partial discharge optical signals in T-type GIS cavities, the optical signals on each detection plane are observed and analyzed under the conditions of different discharge positions, detection distances and angles by modeling and simulation. The results show that: 1) In the case of different discharge positions, the occlusion of the GIS component enables the light spot on the detection plane to generate a dark area, reducing the optical signal strength of the detection plane and the detection point. 2) After T-shaped cornering, the farther the power source is away from, the weaker the optical signal will be. The x50, namely, the discharge source is set at x=50 cm, is taken as an example, it is revealed that the average relative irradiance decreases to 44.31% when the distance from the discharge source is 75 cm is compared to when the distance is 50 cm. 3) When the detection angle is different, the relative irradiance value of the detection point of direct ray is relatively large, and the value of the detection point which is obscured by the component is relatively small. The C1 detection surface and x50 coordinates on the T-type angle are taken as examples, it is revealed that the relative irradiance is largest when the detection angle is 270 degrees, and the relative irradiance is smallest when the detection angle is 225 degrees, which is only 39.02% of the former. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.