【摘要】 鉴于油田电网树型分布的特殊性,提出了一种新的短路故障诊断方法.运用加信法原理,将音频测试信号叠加到电力线上,当发生短路故障时,利用始端、末端端口比值法进行分支定位.实例计算分析表明:对于同一树型电网中的同一分支设置不同类型的短路故障,且故障电阻的大小不同时,|ΔV2fΔV1f|的值大小近似相等,约为1.49290.这种端口比值分支定位法适用于树型结构电网单相、两相或三相短路故障的分支定位.更多还原

【Abstract】 The electric net in oilfield is branched. A method for diagnose short circuit malfunction of electric net in oilfield is presented. The sound signal is input to the circuit. The ratio of voltages in initial point and terminal is used to determine the branched position when short circuit malfunction happens in the electric net. Analysis on an example of circuit net shows that the ratio of voltages at initial point and the terminal is about 1.49290 under the conditions of different malfunctions of short circuit in the same branched electric net and different resistance in the short circuit. This system can locate the malfunction in single\|phase, double\|phase and three\|phase branched nets. It is also used to determine the distance online by measuring the amplitude and phase of port voltage when malfunction happens.更多还原