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如何选用耐火电缆与耐火封闭母线?

返回列表来源:湘江电缆发布日期 2016-02-09 08:23浏览:- 加入收藏

在许多大型建筑物或是重要的建筑物中,除了正常的供配电以外,还配有柴油发电机作为应急电源。一旦电网供电的线路出问题或是建筑物内部出现火灾使市电跳闸断电时,就需要柴油发电机组发电作临时供电,以保证重要的工作不至于停止工作,或保证疏散照明指示人员疏散方向。柴油发电机所发出的电需要通过变电站的部分低压配电柜,经过低压配电柜馈送到需要应急电源的用电设备上去。而柴油发电机与变电站的低压配电柜则是由耐火电缆火狐体育app官网或耐火封闭母线连接成一体的供电系统。

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湘江电缆-耐火电缆

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一、耐火电缆参照采用GB12706-91标准,耐火特性应符合GB12666.6-90的要求,在电缆型号中,耐火电缆是以NH为字头,有带铠(NH-YJV32)与不带铠(NH-YJV)两种。带铠电缆相对于不带铠电缆价格上稍贵一点。因为它们的结构是不同的。

火狐体育app官网 DAIKAIDIANLANDEJIEGOUGONGFENLIUCENG,ZHONGJIANYICENGWEITONGDAODIANXIANXIN,TONGXINWAIDIERCENGWEIYUNMUDAIRAOBAOJUEYUANNAIHUOCENG,DISANCENGWEIJIAOLIANJUYIXIJUEYUANCENG,DISICENGWEINEICHENCENG,DIWUCENGWEIGANGSIKAIZHUANG(HANLIUGENTONGSI),DILIUCENGWEIPVCHUTAO。

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同时,耐火电缆分A、B两种耐火等级,A类的耐火温度为950~1000℃,B类的耐火温度为750~800℃。以NH-YJV云母带/交联聚乙烯复合绝缘聚氯乙烯护套电力电缆(规格为0.6/1KV4×240+1×120)的耐火电缆为例,这种电缆是不带铠的,与其它耐火电缆相比,易于弯曲,敷设方便。电缆导体允许长期工作的最高额定温度为90℃,电缆导体短路温度可达250℃,持续时间不超过5秒。其耐火环境温度一般为700~800℃,可维持1.5个小时的输电运行。其载流量一般为450A左右的电流,敷设时走向比较灵活。当输电电流达到千安级以上时,其耐火电缆的根数增加就比较多。

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湘江电缆-耐火封闭母线

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而在某发电机机房到变电站的线路,则是采用耐火电缆,因为从发电机房到各个变电站的电流都比较小,一般在300~500A左右,而且地下室的电缆沟空间比较小,线路需要拐很多弯,用耐火电缆方便以后的运行维修。总之,在什么情况下选用耐火电缆,在什么情况下选用耐火封闭母线,要视具体情况而定。在线路输送电流不是很大时,而敷设电缆的空间有限,拐弯较多,用耐火电缆是比较合适的。但在线路输送电流比较大时,耐火电缆则需要多根,施工及以后运行维护都不方便;而耐火封闭母线则只是体积稍大一点,施工及以后运行维护都很方便。因此,当线路输送的容量不大时,一般都使用耐火电缆。


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