热电厂消弧线圈及接地选线的技术改造  

Technical reformation of arc suppression coils and grounding line selection

作　　者：廖文树 

机构地区：[1]福建三钢集团有限责任公司,福建三明365000

出　　处：《电力自动化设备》2010年第9期143-145,共3页Electric Power Automation Equipment

摘　　要：提出在单相接地故障瞬时经消弧线圈接地系统投入并联中电阻进行接地选线的新方法。该方法通过理论计算得到与电阻投、切有关的系统系数和各回出线的线路系数,根据系统系数判定是母线接地还是非母线接地,通过线路系数找出接地故障线路。采用所提方法进行系统改造后,零序电流变化量选线和有功功率选线的试验结果表明选线准确性达到100%。A method of grounding line selection is proposed for the system grounded with arc suppression coils,which puts in a parallel grounding medium resistor temporarily during the single-phase grounding fault.The system and line coefficients related to the putting in and out of the parallel medium resistor are calculated theoretically.During the single-phase grounding fault,the system coefficients are used to detect if it is a bus grounding fault and the line coefficients are used to select the faulty line.After the technical reformation,the test results of grounding line selection by zero sequence current variation and active power indicate that the selection veracity is 100 %.

关 键 词：接地选线 消弧线圈 并联中电阻 热电厂 故障线路 

分 类 号：TM621.4[电气工程—电力系统及自动化]