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弧光接地過電壓會發生的危害
【日期】 2013年10月10日   【瀏覽】 [1509]

  弧光接地過電壓會發生的危害

  弧光接地過電壓又叫做間歇性過電壓,弧光的基礎是間歇性電弧,當電弧多次不斷的熄滅和重燃時,會對系統電容電荷多次的重新分配。當電纜線路弧光接地時,過電壓能達到四倍到七倍,所以會對供電設備造成重大的危害。

  弧光接地會產生高幅值的過電壓,能加劇電纜等絕緣體的破壞,在高幅指的弧光接地電壓持續作用下,最終導致絕緣環節對地擊穿,造成短路事故。

  弧光接地會造成保險熔斷,普通的電壓互感器飽和點為1.6到1.8倍,當電壓互感器飽和時,激磁電流增加。

  弧光接地時,過電壓能量由電源控制,能量大。當過電壓超過避雷器承受的能量時,會造成避雷器的爆炸。

  由于高頻電流下,發生單向接地時,穩態工頻電容電流會造成電弧電流的破壞。

  所以,在工礦企業的電纜線路中,為裝備設置消弧柜是必不可少的。

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