王建元,鞠默欣,鞠默然,徐志璇,马雪珂.基于HHT小电流接地电力电缆在线故障测距方法[J].电测与仪表,2015,52(13):. WANG Jian-yuan,JU Mo-xin,JU Mo-ran,XU Zhi-xuan,MA Xue-ke.A Method of Power Cable Fault Location Online in Neutral Point Ineffectively Grounded Power System Based on HHT[J].Electrical Measurement & Instrumentation,2015,52(13):.
基于HHT小电流接地电力电缆在线故障测距方法
A Method of Power Cable Fault Location Online in Neutral Point Ineffectively Grounded Power System Based on HHT
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 power cable fault location online in neutral point ineffectively grounded power system 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 the use of switching overvoltage wave which is generated when the closing occurs. When single-phase-to-earth 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.
