摘要
根据电力变压器的结构特点,本文设计了一种用于局部放电超高频检测的套筒单极子天线,阐明了该天线的结构,给出了天线参数的计算原则和方法。通过优化参数,改变了天线的输入阻抗,使得天线在检测频段内有良好的驻波比特性、较高的增益和稳定的检测方向。经仿真计算和实测得到天线的工作频带为350～500 MHz,中心频率为425 MHz,在整个工作频带内的增益较为稳定,均值达到2.16 dBi左右。实验室中实测表明,该天线可有效检测到变压器局部放电超高频信号,且具有较高灵敏度和良好的方向性。
Based on the structure of power transformer, a sleeve monopole antenna for detecting partial discharge in transformer was designed. In this paper, the antenna structure is described, the calculation principle and method of the antenna parameters are presented. Through optimizing the structure parameters, which change the input impedance of the antenna, good VSWR characteristic, high gain and steady pattern are obtained. According to simulation analysis and actual measurement, the bandwidth of the antenna is 350 - 500 MHz, the center frequency is 425 MHz, the average gain reaches 2.16 dBi and varies little in the whole bandwidth. The laboratory measurement result shows that the sleeve monopole antenna can satisfy the need of partial discharge detection, and detect the partial discharge signals in effective band with high sensitivity and good directivity.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2007年第9期1654-1659,共6页
Chinese Journal of Scientific Instrument
基金
重庆市自然科学基金重点资助项目
