局部放电信号特高频检测对数周期天线优化设计

本文在HFSS软件中建立了对数周期天线的仿真模型，设计了适用于局部放电信号特高频检测的对数周期天线。为得到对数周期天线的最优参数，对天线的材料、馈电点位置和介质基板厚度等相关参数进行了研究，以此得到最优的驻波比。最优参数下的对数周期天线采用PCB板制作，通过对比Peano分形天线的绝缘缺陷放电起始电压和局部放电信号，结果表明：对数周期天线具有较小的起始放电电压，检测电信号的灵敏度高于Peano分形天线；在一个放电周期内，对数周期天线所检测的局部放电次数略多于Peano分形天线，说明对数周期天线局部放电检测性能略优于Peano分形天线。

Optimal design of logarithmic periodic antenna for UHF detection of partial discharge signal

The model of Logarithmic Periodic Antenna(LPA) is built by the HFSS software. The LPA applied to Ultra High Frequency(UHF) detection of Partial Discharge(PD) signal is designed. In order to obtain the optimal parameters of the LPA, the HFSS simulation software is employed to change the relevant parameters such as antenna material, feed point position and dielectric substrate thickness, so as to obtain the optimal standing-wave ratio. The LPA with the optimal parameters is made of Printed Circuit Board(PCB). By comparing the insulation defect initial discharge voltage and PD signal with that of the Peano fractal antenna, the results show that the LPA has a lower initial discharge voltage, and the sensitivity of detecting electrical signals is higher than that of the Peano fractal antenna. In one discharge cycle, the number of PD detected by the LPA is slightly higher than that by the Peano fractal antenna, which indicates that the performance of the LPA is slightly better than that of the Peano fractal antenna.