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如何預防電線電纜因導線過載而起火

如何預防電線電纜因導線過載而起火

發布日期:2018-02-08 作者: 點擊:

電線電纜五分飞艇,五分飞艇app下载在運行的過程中,由于電阻的存在會發熱。導線的電阻一般都很小,其發熱功率可以用公式q=I^2R表示。q=I^2R表明:對于一段實際使用中的導線來說(R已基本恒定),通過導線的電流越大,其發熱功率也越大;若電流量恒定,則導線的發熱功率也是恒定的。在運行過程中放出的熱量會被導線自身吸收從而引起導線溫度的升高。導線在運行過程中雖然不停地在吸收電流做功釋放的熱量,但其溫度不會無限制的上升。因為導線在吸熱的同時,也在不斷地向外界放熱,事實表明,導線通電后溫度逐漸上升,最后溫度恒定在某個點上。在這個恒定點上,導線吸、放熱功率一致,導線處于熱平衡狀態。導線承受較高溫度運行的能力是有限度的,超過某個最高溫度運行會出現危險。這個最高溫度自然也對應某個最大電流,導線超過這個最大電流運行即是過載。導線過載直接導致導線本身及其附近物品溫度升高。溫度升高是導致該類火災最為直接的原因。


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