摘要
变电所变压器中性点出线的系统接地如果设置不当,其杂散电流可能引起电气火灾、地下金属部分被腐蚀、对信息技术设备的干扰、影响安装在配电盘内全面检测接地故障的电流互感器对"漏电火灾"报警的动作有效性等不良后果。本文依据新版国际电工标准对变电所系统(单电源TN系统、多电源TN系统)接地的设置和杂散电流的减小进行了简述。
If the neutral point of the installed improperly, system grounding coiled out of the transformer in the substation is the stray current may arouse the harmful consequences such as electrical fire, the corrosion on underground part of metals, interference to information technical equipments and the influence on warning action＇s validity of the ＂electric leakage fire＂ from the current transformer for overall detection of the grounding fault installed on the switchboard. In this paper, according to new edition standard of IEC, the system （single power supply TN system and multiple power supply TN system） grounding installation and reduction of the stray current in the substation have been briefly described.
出处
《建筑电气》
2007年第9期4-7,共4页
Building Electricity
关键词
系统接地
杂散电流
接地系统引出
电磁干扰
System grounding Stray current Grounding system leading out Electromagnetic interference
