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    \(A\) receives 24 points (8 votes in each of the three head-to-head elections) \(B\) receives 44 points (13 points in the competition against \(A\), plus 10 in the competition against \(C\) plus 21 in the competition against \(D\)) \(C\) receives 38 points (13 points in the competition against \(A\), plus 11 in the competition against \(B\) plus 14 in the competition against \(D\)) \(D\) receives 20 points (13 points in the competition against \(A\), plus 0 in the competition against \(B\) plus 7 in the competition against \(C\)) hE V

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    新闻中心您现在的位置:首页 > 新闻中心 > 如何从声音中判断干式试验变压器是否故障
    如何从声音中判断干式试验变压器是否故障
    发布时间:2023-03-24   点击次数:537次
       相比于油浸式试验变压器,干式试验变压器以环氧树脂为绝缘材料,工作原理和功能*一致,已广泛使用于工厂车间、高层建筑、商业中心、机场、码头、地铁、石油平台等场所的输变电系统,并可与开关柜一起组成结构紧凑的成套变电站。
      干式试验变压器的声音分正常声音和非正常声音。正常声音是由变压器励磁发出的“嗡嗡”声,它是随负载的大小有强弱变化;当变压器出现非正常声,首先分析判断声音是在变压器内部的还是外部。
      如果是内部,可能产生的部位有:
      1、铁心夹持不紧发生松动,将会发出“叮当”和“呼呼”声;
      2、铁心不接地,将会发出“哗剥”“哗剥”的轻微放电声;
      3、开关接触不良将发生“吱吱”“噼啪”声,而且是随负载增加而变大;
      4、套管表面油污严重时会发出“嘶嘶”声。
      如果是外部,可能产生的部位有:
      1、超载运行会发出沉重的“嗡嗡”;
      2、电压过高,变压器声音大而且较尖锐;
      3、缺相运行时,变压器声音较平常尖锐;
      4、电网系统发生磁谐振时,变压器会发出粗细不匀的噪声;
      5、低压侧有短路或接地时,变压器会发巨大的“轰轰”声;
      6、外部连接有松动时,有弧光或火花。
      7、温控故障简单处理。
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