变电站直流系统接地点定位新技术及实施  

A New Technology of Ground Point Location in DC System of Substation and Its Implementation

作　　者：戴平 吴健 龙涛 熊小伏[2] 李善波[2] 

机构地区：[1]国网达州供电公司,四川达州635000 [2]重庆大学电气工程学院,重庆400030

出　　处：《四川电力技术》2013年第5期49-54,共6页Sichuan Electric Power Technology

摘　　要：四川电网变电站多地处潮湿、高低温交变地区,变电站直流回路容易出现因绝缘下降导致的接地故障。现有直流绝缘监测装置难以准确判定直流接地位置,查找并排除直流接地故障耗时费力,因此有必要研究采用新的直流接地定位技术。提出了一种分布式布置的直流接地定位装置构成的直流接地定位系统。该装置利用传感器技术、嵌入式微处理芯片、通信及信号处理技术等高新技术手段,对各直流负载回路的直流参数采集判断并汇总到集中式检测单元,能快速确定直流回路中的具体接地点的位置。既可以在变电站本地查看直流系统的绝缘情况,还可实时将判断结果传送至远方的监控中心。在试验变电站安装了直流接地定位装置,验证了该系统的有效性。Most of the substations in Sichuan power grid are located in humid and high and low temperature alternating areas, so the DC circuit of the substations is prone to ground fault caused by insulation deterioration. It is difficult for the DC insula- tion monitoring device to determine the location of the DC ground accurately and it will take a lot of time and work to find out and remove the ground fault, so it is necessary to adopt a new DC ground location technology. A DC ground location system composed of distributed DC ground location device is presented. With the use of sensor technology, embedded micro - pro- cessing chip, communication and signal processing technology and other high - tech means, this device collects and judges the DC parameters of the DC load circuit and gathers them into a centralized detecting unit, so it can quickly determine the specif- ic ground point of the DC circuit. It is not only able to monitor the insulation condition of the DC system locally, but also will send the judgments to the remote monitoring center in real - time. The DC ground location device is installed in a selected substation and the running results indicate that it is effective.

关 键 词：直流接地 漏电流 故障定位装置 检测单元 

分 类 号：TM645[电气工程—电力系统及自动化]