变电站交流窜入直流报警与录波的研究

Research on Alarm and Recorder of AC Flowing into DC in the Substation

研究了交流窜入直流故障选线技术原理,发现当交、直流馈线发生混接时,所在的交流馈线、直流馈线会同时出现交流和直流漏电流。利用这一点,就可以实现对故障交、直流支路选线。同时考虑改造变电站的便捷,将交流窜入监测装置与绝缘检测装置融合,设计制作了新型智能直流绝缘监测装置系统可以稳定、全面监测直流状态参数,运用在110 k V墨城变交流窜入直流监测改造中,在随后的试验与日常使用中取得良好的效果。

This paper studied the principle of fault location technology for that AC was wired into DC system. It was found that when AC was wired into DC system,the AC leakage current and DC leakage current would appear on the fault AC line and DC line at the same time. The fault AC line and DC line could be realized by using this theory. New intelligent insulation monitoring device which could be used for monitoring DC system state parameters steadily and fully was designed. The device could monitor AC flowing into DC and insulation faults in DC system at the same time. The substation could be retrofitted easily by using this device. This device was used in the 110 k V Mocheng Substation retrofit and it achieved good effect in daily use in the later test.