电缆桥架绝缘单独外包皮，一旦保护不好，长时间暴露在环境空气腐蚀，绝缘性，相对来说会大大降低，会有年龄慢慢硬化，直到秋天，这个时候保温效果不大，一般电缆绝缘是由橡胶和塑料的，那么它的老化是什么原因？下面 山东电缆桥架小编为您讲解一番。

The insulation of the cable tray is wrapped separately. Once it is not well protected and exposed to the ambient air for a long time, the insulation will be greatly reduced, and it will harden slowly until autumn. At this time, the insulation effect is not good. Generally, the cable insulation is made of rubber and plastic. What is the reason for its aging? Next, Shandong Cable Tray will explain it to you.

1、长期过负荷运行：超负荷运行，由于电流的热效应，负载电流通过电缆时必然导致导体发热，同时电荷的集肤效应以及钢铠的涡流损耗、绝缘介质损耗也会产乍附加热量，从而使电缆温度升高。长期超负荷运行时，过高的温度会加速绝缘的老化，以至绝缘被击穿。尤其在炎热的夏季，电缆的温升常常导致电缆绝缘薄弱处首先被击穿，因此在夏季，电缆的故障也就特别多。

1. Long term overload operation: overload operation, due to the thermal effect of the current, when the load current passes through the cable, it will inevitably lead to conductor heating. At the same time, the skin effect of the charge, the eddy current loss of the steel armor, and the insulation medium loss will also produce additional heat, which will increase the cable temperature. During long-term overload operation, excessive temperature will accelerate the aging of insulation, and even the insulation will be broken down. Especially in the hot summer, the temperature rise of the cable often leads to the breakdown of the weak insulation of the cable first. Therefore, in summer, there are many cable failures.

2、化工原料的腐蚀：电缆桥架直接埋在有酸碱作用的地区，往往会造成电缆的铠装、铅皮或外护层被腐蚀，保护层因长期遭受化学腐蚀或电解腐蚀，致使保护层失效，绝缘降低，也会导致电缆故障。

2. Corrosion of chemical raw materials: cable bridge is directly buried in the area with acid and alkali effect, which often causes corrosion of cable armor, lead skin or outer protective layer. The protective layer is subject to chemical corrosion or electrolytic corrosion for a long time, resulting in failure of protective layer, insulation reduction, and cable failure.

3、环境以及温度因素：电缆桥架以及线缆周边的外界环境和热源也会造成电缆温度过高、绝缘击穿，严重的造成爆炸起火。

3. Environment and temperature factors: The external environment and heat source around the cable tray and cable will also cause excessive temperature and insulation breakdown of the cable, which will seriously cause explosion and fire.

4、电缆接头故障：桥架接头是电缆线路中薄弱的环节，由人员直接过失(施工不良)引发的电缆接头故障时常发生。施工人员在制作电缆接头过程中，如果有接头压接不紧、加热不充分等原网，都会导致电缆头绝缘降低，从而引发事故。

4. Cable joint failure: the bridge joint is a weak link in the cable route, and cable joint failures caused by direct negligence of personnel (poor construction) often occur. In the process of making cable joints, if there are loose crimping and insufficient heating of the original network, the insulation of the cable head will be reduced, which will lead to accidents.

此外电缆敷设安装时不规范施工，容易造成机械损伤;在直埋电缆上搞土建施工也易将运行中的电缆损伤等。以上就是问题的解答内容了，您对此有什么疑惑要解答吗？欢迎来我们网站 //www.comprepyme.com咨询！

In addition, the cable laying and installation are not standardized, which is easy to cause mechanical damage; Civil construction on directly buried cables is also easy to damage cables in operation. The above is the answer to the question. Do you have any questions to answer? Welcome to our website //www.comprepyme.com consulting service