Accidents hidden danger of Cable construction is much more in winter

Low medium voltage power cable construction in winter, due to the outdoor temperature are below minus 10 ℃, low temperature of polyvinyl chloride and cross-linked polyethylene insulation and sheath material should suit to present hard brittle features, such as laying accidentally suffers accident knock against, in the process of insulation wire core and copper shield is easily damaged. Even after the cable laying the scene completion test can pass, but later after continuous electricity, cable in the damaged area through the capacitive current eventually, can lead to partial discharge, accelerate the insulation aging, lead to breakdown fault line.

This kind of situation in the low voltage cable performance is not outstanding, performed very well in the medium voltage cable. Sometimes cable factory test without any problems, laying the site due to the limitation of various conditions on cable directly without taking any measures in winter construction, cable laying completed after the scene test everything is normal, but later came a very short time, the power failure, anatomic failure point, appearance without any mechanical damage, but the internal insulation happens serious breakdown and ablation.

Anyte cable

In recent years, some new installation of medium voltage 10kv, 35kv cable fault due to various constraints, not at the scene to cable heating measures, directly around 10 ℃ below zero in winter construction installation on site. The power cable in a short time and white and relatively insulation breakdown fault, by accident, cable production and factory test did not appear abnormal, the scene completion test also smoothly. But electrify malfunction in short time, with no doubt this wire and cable to cable heating measures in winter construction is not relevant.