| 金属氧化物避雷器的特点 |
| 添加时间：2017/7/22 16:41:37 浏览次数： |
| 金属氧化物避雷器的特点 Characteristics of metal oxide arrester 金属氧化物避雷器的非线性电阻阀片主要成分是氧化锌，氧化锌的电阻片具有极为优越的非线性特性。正常工作电压下其电阻值很高，实际上相当于一个绝缘体，而在过电压作用下，电阻片的电阻很小，残压很低。但正常工作电压下，由于阀片长期承受工频电压作用而产生劣化，引起电阻特性的变化，导致流过阀片的泄漏电流的增加。电流中的阻性分量急剧增加，会使阀片上温度上升而发生热崩溃，严重时，甚至引起避雷器的爆炸事故。依照规程1规定，金属氧化物避雷器的检测项目共6项，分别为（1）绝缘电阻（2）直流U1mA及0.75U1mA下的泄漏电流（3）运行电压下的交流泄漏电流（4）工频参考电流下的工频参考电压（5）底座绝缘电阻（6）检查放电计数器动作情况。 The main components of the non-linear resistance valve of the metal oxide arrester are zinc oxide, and the resistance tablets of zinc oxide have excellent nonlinear characteristics. Under normal working voltage, its resistance value is high, which is actually equivalent to an insulator. Under the overvoltage, the resistance of the resistor is small and the residual pressure is low. But under normal working voltage, due to the long time voltage of the valve, it produces deterioration, which causes the change of the resistance characteristic, resulting in the increase of leakage current flowing through the valve disc. A sharp increase in the resistance component of the current can cause a temperature rise in the disc and a thermal collapse. In severe cases, the detonator may even be caused by an explosion. In accordance with the provisions of the code 1, detection of metal oxide surge arrester project a total of 6 items, respectively (1) (2) dc U1mA insulation resistance and leakage current under 0.75 U1mA (3) under the operating voltage of ac leakage current (4) refer to the running power frequency electric power frequency reference voltage (5) the base (6) check the insulation resistance discharge counter action. |
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