基于HHT小电流接地电力电缆在线故障测距方法  

A method of online fault location for small current grounding power cable based on HHT

作　　者：王建元[1] 鞠默欣[1] 鞠默然 徐志璇 马雪珂 

机构地区：[1]东北电力大学,吉林吉林132012 [2]吉林大学,长春130025

出　　处：《电测与仪表》2015年第13期7-10,24,共5页Electrical Measurement & Instrumentation

摘　　要：使用电力电缆进行电力传输已经逐渐被推广,在小电流接地系统发生单相接地故障时,系统可以带故障运行1~2小时,在此期间,需要检测出故障的位置。文章提出一种基于HHT小电流接地系统电力电缆单端在线故障测距的方法,在电缆参数未知的情况下,采用合闸的方法在线测量行波波速,单相接地故障发生后,利用HHT寻找行波瞬时频率突变的时刻,并运用单端测距法实现电力电缆故障测距。最后,对算例进行数值仿真,仿真结果验证了该方法的可行性和实用性。Power cable for power transmission has been gradually extended. The system can be still running 1-2 hours when single-phase-to-earth fault occurs,which requires the location of the fault is detected in the case of UPS. A method of online fault location for small current grounding one-terminal power cable based on HHT is proposed in this paper. Under the condition that the parameters of cable are unknown,the velocity of traveling wave in cable can be measured by using of switching overvoltage wave which is generated when the closing occurs. When single-phase-toearth fault happens,HHT is used to find the mutations moments of instantaneous frequency. Then the location of power cable fault is determined by one-terminal fault location method. Finally,the digital simulation results of an example show the effectiveness and practicability of this method.

关 键 词：HHT 小电流接地系统 电力电缆 在线故障测距 

分 类 号：TM726[电气工程—电力系统及自动化]