GIS局部放电检测天线本体和巴伦共面柔性小型化特高频天线传感器研究

doi:10.19595/j.cnki.1000-6753.tces.211588

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Abstract

In view of the high sensitive detection requirements of partial discharge detection for insulation defects of gas-insulated substation (GIS) in substation, the complicated process of built-in installation of the existing UHF antenna sensor with rigid base and the risk of damaging the internal electric field distribution of the equipment after built-in installation. This paper puts forward the research of flexible UHF sensing technology, combines the antenna body with the flexible material, and reduces the volume of the built-in rear antenna on the premise of ensuring the performance of the antenna to meet the requirements, so as to simplify the complex built-in process and the problem of damaging the electric field distribution. In this paper, a flexible UHF spiral antenna sensor is designed. The antenna body is miniaturized by means of sine wave loading and increasing the gap ratio of the antenna body. At the same time, Balun is co-planar with the antenna body, greatly reducing the overall volume of the antenna. The PD detection performance of the antenna was measured by building a GIS typical defect partial discharge simulation experiment platform. The results show that the flexible antenna can effectively detect PD signals under different bending degrees and has a high signal-to-noise ratio.
Firstly, the common Archimedes spiral antenna was combined with the flexible material PI to build the antenna simulation model, and the performance simulation of the unbent antenna and the antenna with different bending degrees was carried out. Through the simulation of antenna voltage standing wave ratio and direction diagram, it can be seen that antenna body bending has little influence on antenna performance. Then, the common Archimedes spiral antenna is loaded in the form of sine wave. In this way, the size of the antenna body can be effectively reduced. The size and diameter of the designed antenna is 150 mm, and the radial distance is reduced by 25 % compared with that without miniaturization. The antenna model can be bent arbitrarily to improve the complicated installation process of the built-in rigid antenna.
But the Archimedes spiral antenna needs impedance matching device Balun, the existence of Balun for the antenna's built-in brings great inconvenience. Therefore, this paper proposes to reduce the overall antenna impedance while greatly reducing the overall antenna volume by co-planar Balun with the antenna body. Through simulation, it can be seen that changing the antenna gap ratio can reduce the antenna VSWR, but there is a problem that the frequency band with VSWR less than 2 is less. Based on this, this paper combines the design idea of exponential gradient Balun, and uses the gradient gap ratio to make the antenna impedance change smoother. Finally, through simulation, it is determined that the gradual gap ratio can make the working frequency band move to the relatively low frequency. Because the UHF radiated by PD signal is mostly in the range of 300 MHz~1.5 GHz, the gradual gap ratio mode is finally determined for the physical antenna.
After the completion of the actual production, the vector network analyzer was used to test the bending standing wave ratio of the antenna. The measured performance was slightly different from the simulation, but the variation trend was basically the same. Through the comparison between the experimental platform and the mature antenna, it can be seen that the flexible antenna can obviously receive partial discharge signals, and PD signals can be detected under different bending degrees. The results show that the antenna can effectively monitor the discharge signal through the experiment of GIS simulation cavity tank.
In this paper, through the research of antenna body and Balun co-planar flexible miniaturized Archimedes antenna sensor, the influence of changing antenna gap ratio on antenna impedance was analyzed. At the same time, the antenna base was changed to PI flexible material, which provided a new idea for the built-in antenna, and the performance of the designed antenna was analyzed and verified through simulation and experiment. Experiments show that the antenna has excellent radiation performance and meets the detection requirements of the built-in antenna.

Key words： Gas-insulated substation (GIS) partial discharge (PD) UHF flexible antenna miniaturization ratio of metal width arm space (RMWAS)

Received: 01 October 2021

PACS:	TM885
	TN823.31

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	Zhang Guozhi
	Han Jingqi
	Liu Jianben
	Chen Kang
	Zhang Shuo

Cite this article:

Zhang Guozhi,Han Jingqi,Liu Jianben等. Research on Gas Insulated Switchgear PD Detection Antenna Body and Balun Coplanar Flexible Miniaturized Ultra-High Frequency Antenna Sensor[J]. Transactions of China Electrotechnical Society, 2023, 38(4): 1064-1075.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211588 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I4/1064

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