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核级电缆的种类和性能分析

日期:2017年10月28日         文章点击数:

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当人们要求电缆线路在发生火灾时能继续发挥作用,并且当电缆由于使用上的需要架设在高危区域的线路上时,电缆必须具备耐火性能。一旦遇上火警,此种耐火电缆仍能在一定时间内继续安全运行,为人员及设备的抢救提供电能。核电缆的耐火性能按使用要求不同,分一般耐火性能要求和特殊耐火性能要求。特殊耐火性能要求为:在对电缆撞击条件下进行1000% ,5min燃烧试验,火焰熄灭后继续撞击5min,同时用规定压力的高压水冲电缆,要求在整个试验过程中电缆能保持继续通电。
美国1974年制订IEEE383电缆标准后,年发生核电厂电缆着火延燃事故,促使人们重视难燃性试验标准的严格性问题。对于核岛用电缆成品,达到无卤/低烟/阻燃,即要求电缆成品能通过IEC332-3成束燃烧试验,燃烧烟浓度达到IEC1034-2的技术要求,燃烧腐蚀性气体达到IEC754-2规定的推荐值的要求,绝缘线芯通过IPCEAS-19-81规定的单根垂直燃烧试验。

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