避雷器在线监测的意义

The meaning of arrester online monitoring 

1.1 传统检测方法的局限性

1.1 the limitations of traditional detection methods 

目前，避雷器预防性试验方法有两种：停电试验和每年雷雨季节前的带电测试。停电试验主要测量避雷器的绝缘电阻、直流1mA下的电压U1mA及75%U1mA下的泄漏电流。虽然这种方法是目前判断避雷器性能好坏最常用的方式，但由于其试验周期长并具有一定的盲目性，仅依靠停电试验对氧化锌避雷器性能作出判断是不够的。

At present, the lightning arrester preventive test method has two kinds: power test and charged test a year before the thunderstorm season. Power outage test main measuring insulation resistance of lightning arrester, dc voltage U1mA under 1 ma and leakage current under 75% U1mA. While this approach is the judge arrester performance is the most common way, but as a result of the test cycle is long and has a certain blindness, only rely on the power failure test on performance of zinc oxide lightning arrester is not enough to judge. 

每年雷雨季节前的带电测试，是在运行电压下测试避雷器的全电流以及阻性电流。测试过程中由于距带电设备距离小、试验接线等因素存在一定的危险性。另外，我局主网目前有2个500kV变电站、12个220kV变电站，17个110kV变电站，且分布面积较广，每年雷雨季节前测试一次，工作量大，且由于避雷器劣化是一个渐进的过程，一年仅测试一次，是远远不够的。

Charged test a year before the thunderstorm season, is under the operating voltage test full current and resistance current of lightning arrester. Testing process because of the small distance from electric equipment, test wiring etc. There is a certain risk. In addition, our main currently has two 500 kv substation, 12 220 kv substation, 17, 110 kv substation, and has a wide distribution area, the thunderstorm season before test once a year, volume, and the degradation due to lightning arrester is a gradual process, test only once a year, it is not enough. 

1.2 在线监测的意义

1.2 the significance of on-line monitoring 

金属氧化物避雷器在运行过程中会逐渐老化，出现一些潜伏性故障，有些事预防性试验难以及时发现的。在线监测MOA的运行状况，可以在不停电的情况下随时了解MOA运行状态，及时发现可能出现的异常情况和事故隐患，采取预防措施，及时进行检修，以防止事故扩大造成经济损失，这对系统的安全运行，合理安排设备检修时间、节约费用等方面都具有很大的优越性。

Metal oxide surge arrester in the running process will gradually aging, some latent problems, there are some things hard to find in time of the preventive test. On-line monitoring earth-sized operation condition, can at any time without power to understand earth-sized running state, timely find anomalies and potential accidents that may occur, take preventive measures, timely maintenance, in order to prevent the accident expanding caused economic losses, the safe operation of the system, reasonable arrangement of equipment maintenance time, cost saving, etc, have great advantages.