新型变压器局放监测特高频传感器的研究  

Study on new type of UHF sensor for partial discharge detection in transformer

作　　者：朱超杰[1] 王友臣[1] 朱琪[1] 尹毅[1] 

机构地区：[1]上海交通大学电气工程系,上海200240

出　　处：《仪器仪表学报》2013年第4期749-755,共7页Chinese Journal of Scientific Instrument

摘　　要：近年来,特高频法监测变压器内部局部放电得到了广泛的关注,而特高频传感器性能的优劣直接决定着特高频信号的接收。介绍并设计了一种新型变压器局部放电特高频传感器——Goubau天线,研究了阻抗匹配线圈对Goubau天线驻波比的影响,并仿真研究了传感器安装时手孔升高座对传感器驻波比的影响。进一步,在真型变压器上进行了局放监测实验。仿真和实测结果表明,设计的Goubau天线频带为400～1 000 MHz,并在该频段内有2个谐振点,方向图较好,阻抗匹配线圈能明显改善天线驻波比,手孔升高座对Goubau天线性能基本无影响,天线频域响应能够分辨不同的局部放电类型,适用于变压器局部放电特高频信号监测。In recent years ,ultra high frequency （UHF） method has become a widely used method for detecting partial dis- charge （PD） in transformers,and UHF sensor plays a crucial role in this method. A new type of UHF sensor-Goubau an- tenna is introduced and designed in this paper. The effect of impedance-matching coil on voltage standing wave ratio （VSWR） is studied and the influence of hand-hole ascending base on VSWR when the sensor is installed is studied in simulation. Moreover, the sensor was tested in real transformer. Both the simulation and test results show that the frequency band of Goubau antenna is 400 - 1 000 MHz ,within which there are two resonance frequencies. The radiation pattern of the antenna is good. The impedance-matching coil can decrease the VSWR obviously. The hand-hole ascending base can hard- ly influence the antenna performance. The antenna frequency domain response can distinguish different types of PD sources. As a result ,the Goubau antenna is suitable for detecting the UHF signals radiated from transformer PD.

关 键 词：变压器 局部放电 特高频 Goubau天线 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]