现在虽然许多地方已经采用60Ｖ芯线供电方式,但220Ｖ供电有线电视分配网络仍被大范围使用着,一旦这种220Ｖ供电有线电视分配网络出现电源短路,检查起来往往比较麻烦。因为第一,短路的形式比较多,除了火线和零线直接短路以外,还有火线与钢绞线或火线与接地线接触引发的短路;第二 Although many places now use the 60V core power supply, the 220V power cable distribution network is still being used in a wide range of applications. Once this 220V power cable distribution network has a power short circuit, it is often too cumbersome to check. Because first, the form of short-circuit more, in addition to the FireWire and zero line direct short-circuit, there are FireWire and strand or FireWire contact with the ground line caused by the short circuit; the second