XLPE高压电缆短路故障电流在线监测装置设计

通过分析XLPE高压电缆线路短路故障电流回路的特点,设计了XLPE高压电缆短路故障电流在线监测装置.当线路发生短路故障时,短路故障电流在线监测装置实时采集故障电流的大小与方向信息,并根据监测数据分析故障电流回路特性,对于电缆-架空线混合线路,判断故障发生在电缆侧还是架空线侧;对于金属护套交叉互联的长电缆线路,判断故障发生在哪个交叉互联区间.该装置大大缩短了电缆线路发生短路故障后的抢修时间,提高了供电可靠性.

Design of On-line Monitoring Equipment of Short Circuit Fault Current of XLPE High Voltage Cable

By analyzing circuit characteristics of short circuit fault current of XLPE high voltage cable,the on-line monitoring equipment of short circuit fault current of XLPE high voltage cable is designed. During the short circuit fault, the real-time information of the fault current magnitude and direction is collected by the on-line monitoring equipment of short circuit fault. Circuit characteristics of the fault current is analyzed based the monitoring data. In the hybrid situation of cables and overhead lines the equipment can judge the fault location whether at the cable section or at the overhead line section. In the situation of cross connected long distance metal sheathed cables, the equipment can judge in which the cross connected section the fault is located. The equipment can save the repair time after the short circuit fault of cable and thus improves power supply reliability.