消弧线圈并联中阻选线的单相接地试验及分析  

Single Phase-to-earth Test and Analysis for the Fault Line Selection Under Arc-suppression Coil Parallel Connecting the Mid-resistance

作　　者：周志成[1] 付慧[1] 凌建[2] 谢楠[3] 李长益[1] 

机构地区：[1]江苏省电力试验研究院有限公司,南京210036 [2]江苏省电力公司,南京210024 [3]常州供电公司,常州213000

出　　处：《高电压技术》2009年第5期1054-1058,共5页High Voltage Engineering

基　　金：国家电网公司重点科技项目(SGTGY[2007])~~

摘　　要：配网单相故障接地工况复杂,导致选线装置准确率低,影响供电可靠性。为提高选线装置的选线准确率分析了消弧线圈并联中电阻接地选线原理,并进行了35kV系统在金属性、砂土、水泥板、碎石堆、柏油板等工况下的单相接地试验。试验分析发现:选线装置能增大阻性电流信号,克服消弧线圈补偿等影响;利用线路零序电流增量可进行故障选线,并能正确区分母线与线路的单相接地故障;常见接地工况过渡接地电阻的大小依次为柏油板、水泥板、碎石堆、砂土;选线装置在接地过渡电阻很高时可能不动作。PSCAD数字仿真试验得出的规律与试验情况基本一致,从而验证了选线原理的正确性。The correctness of fault line selection device is very low because of the complex single-phase-to-earth fault in distribution network, which affects the reliability of power supply. Consequently, the principle of fault line selection under the arc-suppression coil parallel connecting the mid-resistance grounding was analyzed, and lots of singlephase-to-earth tests are carried out respectively on the metal slab, sand soil, floor slab, gravel pile, asphalt slab in 35 kV system. Conclusions are drawn by analyzing the test data： the fault line selection device can increase the resistance component of electric current, which can overcome the compensation of arc-suppression coil. The variable of electric current of fault line is much larger than the normal lines, which can he the criterion of fault line selection, and the line fault or bus fault can be distinguished rightly. The values of transition resistance change from large to little in the following sequences, the asphalt slab, floor slab, gravel pile, sand soil take turns. However, the fault line selection will not act in time due to the high grounding transition resistance. Finally, the same laws of PSCAD simulation validate the results of tests.

关 键 词：故障选线装置 消弧线圈并联中电阻 35 KV系统 单相接地试验 接地过渡电阻 PSCAD 

分 类 号：TM862[电气工程—高电压与绝缘技术]