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总电源防雷器安装注意事项是什么

总电源防雷器安装注意事项是什么

浏览：32次 | 提问时间： 08-03 08:17

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柠檬花盛开 08-03 08:18

防雷器安装时，必须在防雷器的前面串联电流熔断装置，以防止电源防雷器短路性损坏之后，引发火灾或其它事故！可以选择的电流熔断装置有 :1 熔断丝2 空气开关3 防雷熔断丝

绿皮车 08-03 08:26

总电源防雷器安装一定要注意接地线要接好。而且接地线是有要求的，一般来说防雷器的接地线路电阻要小于4.0Ω，具体你要算算你用的线的线线阻有多大，推荐使用RV2.5以上的线来做接地线。接地线的连接一定不能与建筑物防雷带或者避雷针连接在一起，应该连接到附近供电箱的接地线扁铁上。

唇齿间的依偎 08-03 08:34

1.　应安装在靠近配电变压器侧　　金属氧化物避雷器(MOA)在正常工作时与配变并联，上端接线路，下端接地。当线路出现过电压时，此时的配变将承受过电压通过避雷器、引线和接地装置时产生的三部分压降，称作残压。在这三部分过电压中，避雷器上的残压与其自身性能有关，其残压值是一定的。接地装置上的残压可以通过使接地引下线接至配变外壳，然后再和接地装置相连的方式加以消除。对与如何减小引线上的残压就成为保护配变的关键所在。引线的阻抗与通过的电流频率有关，频率越高，导线的电感越强，阻抗越大。从U

神经女 08-03 08:42

IR可知，要减小引线上的残压，就得缩小引线阻抗，而减小引线阻抗的可行方法是缩短MOA距配变的距离，以减小引线阻抗，降低引线压降，所以避雷器应安装在距离配电变压器近点更合适。　　2. 配变低压侧也应安装　　如果配变低压侧没有安装MOA，当高压侧避雷器向大地泄放雷电流时，在接地装置上就产生压降，该压降通过配变外壳同时作用在低压侧绕组的中性点处。因此低压侧绕组中流过的雷电流将使高压侧绕组按变比感应出很高的电势(可达1000 kV)，该电势将与高压侧绕组的雷电压叠加，造成高压侧绕组中性点电位升高，击穿中性点附近的绝缘。如果低压侧安装了MOA，当高压侧MOA放电使接地装置的电位升高到一定值时，低压侧MOA开始放电，使低压侧绕组出线端与其中性点及外壳的电位差减小，这样就能消除或减小“反变换”电势的影响。　　3. MOA接地线应接至配变外壳　　MOA的接地线应直接与配电变压器外壳连接，然后外壳再与大地连接。那种将避雷器的接地线直接与大地连接，然后再从接地桩子上另引一根接地线至变压器外壳的作法是错误的。另外，避雷器的接地线要尽可能缩短，以降低残压。　　4. 严格按照规程要求定期检修试验　　定期对MOA进行绝缘电阻测量和泄露电流测试，一旦发现MOA绝缘电阻明显降低或被击穿，应立即更换以保证配变安全健康运行。

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