天津快乐十分

郑州电线电缆

如何预防电线电缆因导线过载而起火

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如何预防电线电缆因导线过载而起火

发布日期:2018-02-08 作者: 点击:

电线电缆天津快乐十分在运行的过程中,由于电阻的存在会发热。导线的电阻一般都很小,其发热功率可以用公式q=I^2R表示。q=I^2R表明:对于一段实际使用中的导线来说(R已基本恒定),通过导线的电流越大,其发热功率也越大;若电流量恒定,则导线的发热功率也是恒定的。在运行过程中放出的热量会被导线自身吸收从而引起导线温度的升高。导线在运行过程中虽然不停地在吸收电流做功释放的热量,但其温度不会无限制的上升。因为导线在吸热的同时,也在不断地向外界放热,事实表明,导线通电后温度逐渐上升,最后温度恒定在某个点上。在这个恒定点上,导线吸、放热功率一致,导线处于热平衡状态。导线承受较高温度运行的能力是有限度的,超过某个最高温度运行会出现危险。这个最高温度自然也对应某个最大电流,导线超过这个最大电流运行即是过载。导线过载直接导致导线本身及其附近物品温度升高。温度升高是导致该类火灾最为直接的原因。


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