济南电缆桥架的线缆主要靠外面一层包皮绝缘，如果保护不好，长时间受到外界气体的腐蚀，绝缘性能逐渐降低，慢慢老化变硬，发脆或脱落，这时就不能起绝缘作用了。线缆的外表的绝缘层多用塑料和橡胶制成，有时候发现老化了，这种情况是由哪些原因造成的呢?

The cables of cable tray in Jinan are mainly insulated by the outer sheath. If the protection is not good and the cables are corroded by the external gas for a long time, the insulation performance will gradually decline, and the cables will slowly age and become hard, brittle or fall off. At this time, the insulation will not work. The insulation layer on the surface of the cable is often made of plastic and rubber, and sometimes it is found that it has aged. What are the reasons for this situation?

1、绝缘受潮情况。

1. Damping of insulation.

一般这样的情况也相对常见，通常发生在直埋或排管里的电缆接头处。比如：电缆接头制作不合格和在潮湿的气候条件下做接头，会使接头进水或混入水蒸气，在电场作用下形成水树枝，逐渐损害电缆的绝缘强度而造成故障。

This situation is also relatively common, usually occurring at cable joints directly buried or in ducts. For example, unqualified cable joints and joints made in humid weather conditions can cause water or steam to enter the joints, forming water branches under the action of an electric field, gradually damaging the insulation strength of the cable and causing faults.

2、化工原料的腐蚀。

2. Corrosion of chemical raw materials.

电缆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。

Directly burying cables in areas with acid-base effects often leads to corrosion of the cable's armor, lead skin, or outer protective layer. The protective layer may become ineffective due to long-term chemical or electrolytic corrosion, resulting in reduced insulation and cable failure.

3、长期过负荷运行。

3. Long term overload operation.

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被击穿，因此在夏季，电缆的故障也就特别多。

Overload operation, due to the thermal effect of the current, when the load current passes through the cable, it will inevitably cause the conductor to heat up. At the same time, the skin effect of the charge, as well as the eddy current loss and insulation medium loss of the steel armor, will also generate additional heat, thereby increasing the temperature of the cable. During long-term overload operation, excessively high temperatures can accelerate insulation aging, leading to insulation breakdown. Especially in hot summer, the temperature rise of cables often leads to the first breakdown of weak insulation areas, so there are particularly many cable faults in summer.

4、电缆接头故障。

4. Cable connector failure.

电缆接头是电缆线路中较薄弱的环节，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。

Cable joints are relatively weak links in cable routes, and cable joint failures often occur due to personnel's direct negligence (poor construction). During the production of cable joints by construction personnel, if there are loose crimping or insufficient heating of the joints in the original network, it will lead to a decrease in the insulation of the cable head, leading to accidents.

5、环境以及温度因素。

5. Environmental and temperature factors.

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。

The external environment and heat source around the cable tray and the cable will also cause the cable temperature to be too high, insulation breakdown, and serious explosion and fire.

电缆桥架的线缆外表老化原因就讲解到这里了，希望能够给您好的帮助，更多事项就来我们网站http://www.sdhangfeng.com咨询！

This is the reason why the appearance of cable tray cables is aging. I hope I can help you. More information can be found on our website http://www.sdhangfeng.com consulting service