模拟局部放电信号注入法在电缆带电测试中的应用

Application of Simulating PD Signal Injection Method in Cable Electrification PD Testing

为了解运行电缆及其附件的绝缘状况,及时发现潜在缺陷隐患,以保障电力电缆线路的安全可靠运行,提出采用模拟局部放电(partial discharge,PD)信号的脉冲发生器(pulse generator,PG)在运行电缆的中间接头或终端注入模拟PD信号的方法对110 kV及以上电压等级电缆进行带电PD检测。介绍模拟PD信号的PG在电缆带电PD测试中的应用原理及操作方法。以一些现场实际电缆线路测试为案例,采用直接注入和间接注入模拟PD信号进行电缆中间接头、终端、PD定位测试,分析注入模拟PD信号与实测PD信号的异同,证明了模拟PD信号注入法对PD信号的判断、定位以及定量评价均可行、有效。

For understanding insulation condition of operational cable and its accessories and finding potential hidden defects in time in order to ensure safe and reliable operation of electric cable lines, this paper proposes to use method of injecting simulating PD signal into intermediate head or terminal of the operational cable through pulse generator which uses simula- ting PD signal for detecting PD electrification of cable with 110 kV voltage or above. It introduces application principles and operational way of PG with simulating PD signal in cable electrification PE testing. Taking some practical cable line testing as examples, it uses directly injected and indirectly injected simulating PD signals to proceed testing for intermediate head, terminal and PD positioning, analyzes differences and similarities of simulating PD signals and actual measuring PD signals and proves feasibility and effectiveness of simulating PD signal injection method for judgement , positioning and quantitative evaluation.