描述
NW-RR85-001
处理故障电容器应在断开电容器的断路器，拉开断路器两则的隔离开关，并对电容器组经放电电阻放电后进行。电容器组经放电电阻(放电变压器或放电电压互感器)放电以后，由于部分残存电荷一时放不尽，仍应进行一次人工放电。放电时先将接地线接地端接好，再用接地棒多次对电容器放电，直至无放电火花及放电声为止，然后将接地端固定好。由于故障电容器可能发生引线接触不良、内部断线或熔丝熔断等，因此有部分电荷可能未放尽，所以检修人员在接触故障电容器之前，还应戴上绝缘手套，先用短路线将故障电容器两极短接，然后方动手拆卸和更换。对于双星形接线的电容器组的中性线上，以及多个电容器的串接线上，还应单独进行放电。
电容器在变电所各种设备中属于可靠性比较薄弱的电器，它比同级电压的其他设备的绝缘较为薄弱，内部元件发热较多，而散热情况又欠佳，内部故障机会较多，制造电力电容器内部材料的可燃物成分又大，所以运行中极易着火。因此，对电力电容器的运行应尽可能地创造良好的低温和通风条件。当电容器喷油、爆炸着火时，应立即断开电源，并用砂子或干式灭火器灭火。此类事故多是由于系统内、外过电压，电容器内部严重故障所引起的。为了防止此类事故发生，要求单台熔断器熔丝规格必须匹配，熔断器熔丝熔断后要认真查找原因，电容器组不得使用重合闸，跳闸后不得强送电，以免造成更大损坏的事故。
电容器的断路器跳闸，而分路熔断器熔丝未熔断。应对电容器放电3min后，再检查断路器、电流互感器、电力电缆及电容器外部等情况。若未发现异常，则可能是由于外部故障或母线电压波动所致，并经检查正常后，可以试投，否则应进一步对保护做全面的通电试验。通过以上的检查、试验，若仍找不出原因，则应拆开电容器组，并逐台进行检查试验。但在未查明原因之前，不得试投运。
当电容器的熔断器熔丝熔断时，应向值班调度员汇报，待取得同意后，再断开电容器的断路器。在切断电源并对电容器放电后，先进行外部检查，如套管的外部有无闪络痕迹、外壳是否变形、漏油及接地装置有无短路等，然后用绝缘摇表摇测极间及极对地的绝缘电阻值。如未发现故障迹象，可换好熔断器熔丝后继续投入运行。如经送电后熔断器的熔丝仍熔断，则应退出故障电容器，并恢复对其余部分的送电运行。
产品承诺：
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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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