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Internal UHF antenna for partial discharge detection in GIS

机译：内置UHF天线，用于GIS中的局部放电检测

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摘要

A compact ultra-high-frequency (UHF) antenna is developed in this work. First, by means of shifting symmetrical octagonal monopole into asymmetrical one, the impedance matching performance of antenna at high frequencies is improved; then, by cutting the radiation patch and ground plane in part, the antenna is reduced by 37.9% in size while maintaining its bandwidth; finally, a Γ-shaped slot on the ground plane is utilised to create an additional resonance, decreasing the low cutoff frequency without enlarging the antenna volume. The proposed antenna only occupies 124 mm × 77 mm × 1.6 mm and achieves 3:1 voltage standing wave ratio from 575 MHz to more than 4.5 GHz, along with simple structure, good radiation patterns, moderate peak gain, and strong pulse handling capability. Furthermore, the electrical dimension, ratio bandwidth, and bandwidth dimension ratio are compared with those of existing broadband antennas. The partial discharge (PD) experiments have been carried out for four typical insulation defect models in gas-insulated switchgear (GIS), and the results demonstrate that it is more sensitive to PD signals arising from floating metal, free metal particle, and void in the epoxy resin as compared to the disc coupler.
机译：在这项工作中开发了一种紧凑的超高频（UHF）天线。首先，通过将对称的八边形单极子转变为不对称的单极子，提高了天线在高频下的阻抗匹配性能。然后，通过部分切割辐射补丁和接地平面，在保持带宽的同时将天线尺寸减小37.9％。最后，利用接地平面上的Γ形缝隙来产生额外的谐振，从而在不增加天线体积的情况下降低了低截止频率。拟议中的天线仅占124 mm×77 mm×1.6 mm，在575 MHz至4.5 GHz以上的频率范围内可实现3：1的电压驻波比，而且结构简单，辐射方向图良好，峰值增益适中且脉冲处理能力强。此外，将电尺寸，比率带宽和带宽尺寸比率与现有的宽带天线进行了比较。对气体绝缘开关设备（GIS）中的四种典型绝缘缺陷模型进行了局部放电（PD）实验，结果表明，该模型对漂浮金属，自由金属颗粒和空隙中的PD信号更加敏感。与圆盘耦合器相比环氧树脂。

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