煤矿35 kV配电线路行波故障测距技术

为解决煤矿供电系统中35kV线路故障点不易查找的问题,提出了综合利用母线端检测到的故障初始电流行波和线路末端检测到的故障初始电压行波实现线路故障快速定位的新方法。分析发现,线路单相接地和相间短路故障都产生行波线模分量,因此对各种类型故障都可采用参数稳定的线模分量作为测量信号,利用可靠的双端行波测距法测量出故障点位置。简要介绍了行波故障测距系统的构成及基本工作原理,详细阐述了行波信号的获取、超高速数据采集、时钟精确同步以及故障测距精度的提高等关键技术问题的解决方案。现场试验证明了所提方法的正确性。

Fault locating of 35 kV transmission lines in coal mine based on traveling waves

Aiming at the difficulty in locating the fault of 35 kV line of coal mine power supply system,a fast fault locating method is brought forward,which comprehensively utilizes the fault original current traveling wave measured at bus and the fault original voltage traveling wave measured at line terminal.The aerial mode component of traveling waves has been found appeared in the single-phase-to-ground fault and the phase-to-phase short-circuit fault.Thus the aerial mode component with stable parameters can be adopted as measurement signal for different fault types to locate the fault with two-terminal traveling wave locating method.The constitution and basic working principle of fault locating system is introduced,and the solution to essential technical troubles is particularly elaborated,including the gain of traveling wave signal,the acquisition of super high speed data,the precise synchronization of clock and the enhancement of fault locating precision.The field test proves its accuracy.