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随着社会主义建设的发展,电力电缆的应用越来越广泛。用电较多的工矿企业和其它一些单位很多是用埋地电缆供电的。用电缆供电有许多优点,但其主要问题之一是发生故障以后测寻比较困难。电力电缆故障是由于故障点绝缘损坏而引起的,它的型式很多,其中大多数是属于高阻故障,即故障点的电阻值很高,常达几兆欧,甚至几百兆欧以上。对这样的高阻故障,一般的低压仪器无法直接测量。过去测寻故障要经过“烧穿”、“粗测”和“定点”等几个步骤:即首先在电缆的故障相加高的电压,使故障点流过电流而发热将故障点的绝缘进一步烧坏,
With the development of socialist construction, the application of power cables is more and more widespread. Many industrial and mining enterprises and other units that consume more electricity are powered by buried cables. Cable power supply has many advantages, but one of the main problems is that it is more difficult to find after a fault occurs. Power cable fault is due to fault damage caused by insulation, and its many types, most of which are high-impedance fault, the fault point of the high resistance, often up to a few megohms, or even hundreds of megohms. For such high-impedance faults, the general low-voltage instruments can not measure directly. In the past to find fault to go through the “burn through”, “rough test” and “fixed-point” and several other steps: First of all in the cable fault plus phase voltage, so that the fault flow through the current and heat the fault point insulation further Burn out,