高压电容式套管局部放电在线监测的研究

 局部放电是引发高压电气设备内部绝缘故障和老化的关键因素，研究、应用局部放电检测方法，及时、有效、灵敏地检测出局部放电及其强度，是提高高压电气设备安全运行可靠性的有效手段。在脉冲电流法监测局部放电信号的基础上，结合罗氏线圈响应频带宽，灵敏度高，安装方便等特点，通过分析电容式套管局部放电原理和信号传播过程，设计出了基于罗氏线圈高压电容式套管在线监测系统。最后，进行验证性试验，结果表明:所设计的电容式套管局部放电信号监测电路是确实可行的。该方法能够有效的检测出局部放电脉冲信号，准确性高，成本低，具有较好的实用性和广阔的应用前景。

Study on On- Line Monitoring and Measuring of Local Discharge on High Voltage Capacitance Type Casing

The local discharging is the key factor to cause the inner insulation fault and aging of the high voltage electric equipment.A study and application of the local discharging measuring method and the timely effectively and sensitively measurement of the local discharging and strength would be the effective means to improve the safety operation reliability of the high voltage electric equipment.Base on the pulse current method applied to monitor and measure the local discharging signals,in combination with the wide response frequency,high sensitivity,easy installation and other features of the Rogowski coil,with the analysis on the local discharging principle and the signal transmission process of the capacitance type casing,a on-line monitoring and measuring system of the high voltage capacitance type casing was designed base on the Rogowski coil.Finally a verification test was conducted.The results showed that the local discharging signal monitoring and measuring circuit of the capacitance type casing designed was practical and feasible.The method could effectively to detect the pulse signal of the local discharging with high accuracy,low cost,good practicality and wide application prospect.