1. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. Key Laboratory for Sulfur Hexafluoride Gas Analysis and Purification of SGCC, State Grid Anhui Electric Power Research Institute, Hefei 230022, China
基金项目:
国家重点研发计划(2017YFB0902500);
国家电网有限公司总部科技项目(环保型管道输电关键技术);
Project supported by National Key R & D Program of China (2017YFB0902500), Science & Technology Project of SGCC (the Key Technology of Environment-fiendly Gas-insulated Transmission Line);
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.
KEY WORDS :GIS;partial discharge;optical signal;irradiance;T-shaped;propagation characteristics;
局部放电时信号的传播特性是布置传感器策略的基础。针对GIS局部放电时辐射出的特高频电磁波信号,目前国内外已对其传播特性开展了相关研究,如日本九州工业大学的M. Hikita、K. Omori[15-17],英国斯特莱斯克莱德大学的M. D. Judd[18]等。我国已有高校对不同形状GIS模型中局放特高频信号进行了仿真计算[19],设计了一种内置式超高频传感器[20],并通过实验验证了仿真结果。
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