用接地线电流法进行电力电缆绝缘在线监测的仿真计算  

Simulation of Online Monitoring of Power Cable Insulation Using Grounding Current Method

作　　者：段建东[1] 陈天翔[1] 张保会[1] 杨晓宪[1] 

机构地区：[1]西安交通大学电气工程学院

出　　处：《高压电器》2005年第1期29-31,35,共4页High Voltage Apparatus

摘　　要：为单相电力电缆接地电容电流、三相电力电缆接地不平衡电流建立了电缆的分布参数仿真模型,计算了电力电缆在运行条件下其接地电容电流、接地不平衡电流对电缆绝缘缺陷状况反映的有效性与灵敏性。仿真结果表明,在线监测得到的接地电容电流或接地不平衡电流与绝缘缺陷有很高的正相关性,并且灵敏性较高,其灵敏性与电缆负载、缺陷位置等有关,三相电力电缆接地不平衡电流反映缺陷的灵敏度要明显高于接地电容电流。开发的基于ATP的仿真模型及相应的Matlab分析软件可以作为一种良好的学习型软件,用以指导现场在线监测测量结果的分析及故障部位的确定。This paper sets up simulation models with distributed parameters for power cable to calculate grounding capacitive current in single-phase power cable and grounding imbalance current in three-phase power cable, and analyses the effectiveness and sensitivity of the grounding current to the insulation defect. The simulation results show that the cable insulation defect is positively correlative with both the grounding capacitive current and the grounding imbalance current, moreover, the latter is more sensitive. The sensitivity is relative to the load and the defect location. The simulation models and software based on ATP and Matlab, as a nice learning tool, are also useful to analyze the measurement results on site and guide to determine the location of cable fault.

关 键 词：电力电缆 在线监测 接地电流 ATP仿真 

分 类 号：TM855[电气工程—高电压与绝缘技术]