高频接地技术对发电机局放检测信号的影响  

Influence of High-Frequency Grounding Technology on PD Detecting in Generator

作　　者：喇元[1] 王凯[1] 徐阳[1] 邱昌容[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高电压技术》2005年第5期25-27,共3页High Voltage Engineering

摘　　要：采用高压电容耦合器在线监测发电机局部放电的系统中,靠近电容耦合器一端的同轴电缆屏的接地方式以及检测阻抗的安装位置都与监测系统的灵敏度有关。实验室模拟试验及现场试验说明:常用的近端直接接地方式不仅使局放信号有较大的衰减,而且有可能引入干扰。高频接地可有效提高局部放电测量系统的信噪比和抗干扰能力,同时,检测阻抗接在靠近电容耦合器一端时系统的灵敏度较高。In the PD detecting system of the generator with the high-voltage capacitance couple, the sensitivity of the system has closely relation with both the way of grounding of the shielding layer near the coupler of cable and the location of the detecting resistance. Through the simulating experiment in the laboratory and the on-site experiment, several results can be concluded. It not only makes the signals of PD weakening greatly but also probably introduces interference by the way of grounding directly. It can improve the signal-to-noise ratio of the system and the ability of anti-interference through the way of High-Frequency grounding. The sensitivity will be higher if the detecting resistance is mounted near the capacitance couple.

关 键 词：高频接地 发电机 局部放电 脉冲 

分 类 号：TM31[电气工程—电机]