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  電氣火災監控系統可預防的電氣火災主要有哪些?有哪幾種?


  電氣火災監控系統是一種智能電氣火災檢測模型 ,能夠準確地計算電氣火災發生的概率 ,充分地對電氣線路、用電和供配電設備容易發生火災事故的因素進行監控 ,使人們能夠及時發現和排除火災隱患 ,使電氣火災事故的發生得到遏制。


  電氣火災引起的原因有很多 ,其中主要的是由于電氣線路及相關設備的表面出現問題 ,突然釋放大量的熱能而產生的 :造成電氣線路表面熾熱因素有電弧電壓、電火花和電熱器等 ,當電氣線路的表面一旦具備了燃燒的條件 ,電氣線路本身和周圍的易燃性物就有可能被引燃 ,從而造成嚴重的火災現象 ,當然現實生活中的自然災害如(雷雨和強靜電)也有可能引發火災現象。

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  1、由線路短路引發的火災


  線路安全主要體現的是導線本身及導線間銜接是否準確 ,導線本身表面是絕緣的 ,一旦絕緣體表面被破壞 ,在破破損處就造成火線與火線、火線與地線交叉在一起 ,瞬間就有可能引發電流陡增現象 ,這種特殊的現象稱為短路。電火花或電弧引發火災主要原因為單相接地故障 ,主要體現為導體的絕緣表面被破壞、被擊穿而產生的電弧電壓。電弧電壓將產生很高的溫度 ,如 1A~10A 的電弧電流就可以產生 1000℃ ~2000℃的局部  高溫。短路現象最后導致的結果就是突然電阻的阻值變小了、突然電流的流量變大 ,這種瞬間的變化就會產生大量的熱量 ,這種熱量嚴重的超出了線路正常工作時所能承擔的熱量 ,結果造成短路處出現強火花和電弧 ,引起附近的易燃可燃物燃燒 ,造成火災。


  2、接觸電阻過大引起火災


  所謂的接觸電阻就是在兩個線路接頭的地方形成的電阻。如果接頭處存在著問題如 :存在雜質或接觸不良等原因 ,這種現象就有可能造成接觸處的表面接觸電阻突然變大。此刻一旦遇到強電流通過時 ,接觸表面瞬間就會產生強大的熱量 ,使接觸處的表面層的金屬被熔化,表面絕緣層被破壞引起燃燒現象,同時造成周圍的一些相關物質(導線上積落的粉塵、纖維)等引燃 ,造成火災。

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  3、超過日常安全載流量引起火災


  電流流量通過導線時超過日常安全載流量我們稱之為超負荷。超負荷能導致導線自身的絕緣層部分表面老化品質下降。當電流的流量超過日常安全載流量的兩倍以上時 ,此時該處電流通過線路時的溫度積聚增加 ,有可能引起線路的絕緣層融化而自燃 ,引燃了線路周圍的可燃物 ,造成火災。


  4、線路漏電引起火災


  所謂的線路漏電是指線路中某一處的導線由于某種原因造成線路絕緣層的表面的絕緣能力下降了 ,造成導線內部互流、電線與大地之間也有互流的現象。造成漏電火災的原因 ,一是熱作用 ,二是電火花。當線路出現這種現象時 ,致使線路遺失的電流流入到大地中 ,此時如果恰巧有大電阻通過時 ,局部線路的絕緣層表面溫度積聚增加 ,這種絕緣層表面溫度積聚增加現象可引燃周圍的可燃物 ,造成火災。

  5、電弧引起火災

  合理的應用智能化電氣火災監控系統 ,就能及早在各種電路的預防和監控中發現超常狀態以及能引線路的故的原因 ,及早發現引起各種電氣火災事故的事故隱患 ,及時準確的做出相應的判斷 ,使避免事故發生在萌芽狀態。

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