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Cable winter construction accidents

Information Source:Henan Huadong Cable Co., Ltd Release date:2014-06-28

When the low/medium voltage power cables are constructed in winter, due to the outdoor temperature is below 10 ℃ below zero, crosslinking polyethylene and PVC insulation and sheath material present hard brittle characteristics under the low temperature, If accidentally suffered accident knock in the process of laying, core of insulation wire and copper shield is easily damaged.

Even the cable can pass the scene completed test after laying, after continuous electrify in later period,  the damaged area can also cause partial discharge after through the capacitive current,accelerate the insulation aging, leading to breakdown fault line. This kind of situation in the low voltage cable performance is not outstanding, but performed very well in the medium voltage cable. Sometimes the cable factory test without any problem, but On-site installation, due to the limitation of various conditions, cable was directly constructed without taking any measures in winter. After the cable laying passed the completed on-site test and everything is normal, but there have been breakdown in the short time after power on. Appearance without any mechanical damage after the anatomy of the point of failure, but internal insulation happens serious breakdown and ablation.

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