煤矿井下供电网络防越级跳闸装置的应用研究

Research on Application of Anti-leapfrog Tripping Device of the Underground Power Supply Network in Coal Mine

由于井下供电网络大量的采用了并行短距离线路布设方案,当发生短路故障时,无法有效的对故障进行隔离,极易出现越级跳闸事故,导致井下大范围的网络故障,同时故障发生后极难对故障位置进行判断,需要花费大量的时间进行故障排查和修复,给井供电安全造成了极大的隐患。本文提出了一种新的井下供电网络防越级跳闸装置,该装置采用了基于电流纵联差动保护原理和故障主动定位技术,能够实现对供电网络故障的及时定位和隔离,有效的保护井下供电网络的运行安全、缩短故障处理时间。根据实际应用表明该防越级跳闸装置具有可靠性高、稳定性好、故障定位精确的优点,能够将供电网络故障的概率降低73%,将故障处理时间降低90%以上,极大的提升了煤矿井下的供电稳定性和可靠性。

As a large number of underground power supply networks adopt the layout scheme ofparallel short-distance lines,when a short-circuit fault occurs,the fault cannot be effectively isolated,so leapfrog tripping accidents will easily occur,and it results in a large range of underground network faults.At the same time,it is extremely difficult to judge the fault location after the fault occurs,and it takes a lot of time to troubleshoot and repair the fault,thus causing great hidden dangers to the safety of underground power supply.In this paper,a new anti-leapfrog tripping device for underground power supply is proposed.The device adopts the principle of current longitudinal differential protection and active fault location technology,which can realize the timely location and isolation ofpower supply network fault,effectively protect the operation safety of underground power supply network and shorten the fault processing time.The practical application shows that the device has the advantages of high reliability,good stability and accurate fault location.It can reduce the probability of power supply network fault by 73%,reduce the fault processing time by more than 90%,and greatly improve the stability and reliability of power supply in coal mine.