| 小电流接地故障危害 |
| 添加时间：2017/6/20 16:03:38 浏览次数： |
| 1、两个非毛病相对地电压成为线电压，升高√3倍。假如电弧不断地平息、重燃，线路电容不断地充放电，电压有升至3倍以上的风险，如致使非毛病相绝缘薄弱点击穿，就会形成相间短路毛病，事端就扩大了。 1, two non-fault voltage becomes line voltage, increase the square root 3 times. If kept calm and rekindle arc, the line capacitance charge-discharge unceasingly, the risk of voltage has risen to more than three times, such as causing the fault phase insulation breakdown, vulnerabilities will form the interphase short circuit fault, disturbance is expanded. 2、接地电弧长期存在，也许烧穿电缆线路绝缘，使其发展为相间短路故障。 The ground arc has long existed, and may be burned through cable insulation, which makes it a short-circuit fault. 3、导线掉在地上，走近接地点的人和动物就会特别危险。 3, the conductor falls on the ground, and the people and animals that come to the site are particularly dangerous. 因而，电力人对配电网中性点采用小电阻接地还是小电流接地方法，一向很纠结。要是可以处理小电流接地选线定位问题，及时跳开持久接地的故障线路，岂不兴利去害，大快人心! Thus, the electric power man has always been very conflicted about using the small resistance ground or the small current ground method for the distribution network. If you can handle the problem of locating the small current to the ground, and then jump to the long lasting ground fault line, you will not be able to harm, it is very popular! 顺便说一下，对于导线坠地毛病，由于接地电阻上千欧，既使采用小电阻接地，接地电流也只要几个安培，现有维护技能也是不灵的。这是一个世界性的技能难题。 By the way, the existing maintenance skills are not good because of the fact that there is a low resistance to the wire and the fact that the ground resistance is thousands of euros, and the electrical current is only a few amperes. This is a worldwide skill problem. |
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