We can often see the cable company such a notice: the production of power cable insulation thickness failure. What is the impact of the specific insulation layer thickness failure on the cable? How the sheath is considered qualified? How do we manufacture in the production of eligible cables?
一, Reduce the service life of wire and cable products
This is easy to understand, after long-term operation, especially direct burial, immersed in water, exposed to the open air or corrosion-prone environments, as a result of prolonged corrosion of the external medium, the sheath of the thinnest point of the level of insulation and the mechanical level will be reduced.
Coupled with routine sheath test inspections or the occurrence of line ground faults, the thinnest point may be penetrated. Thus, the protective effect of the cable sheath is lost. In addition to this, the inherent consumption should not be ignored. Wire and cable generate a lot of heat when they are energized for a long period of time.
Here to add a little common sense: the allowable operating temperature of the conductor is 70 ℃, PVC long-term use temperature should not exceed 65 ℃.
二, Increasing the difficulty of the laying process
With the development of global industry, more and more environmental requirements of high-voltage cable products must be done to achieve a small OD, in the process of laying the need to consider leaving a gap, so as to dissipate the heat generated by the wire and cable energized, the thickness of the sheath is too thick will increase the difficulty of laying, so the thickness of the sheath is required to strictly comply with the relevant standards, otherwise it can not play a role in protecting the wires and cables. Can not just pursue its thickness.
In summary, in the production process, we only after careful operation of the equipment, according to the standard requirements of strict control of the thickness of the sheath, so that not only for the enterprise to save resources, reduce material consumption, increase profits, but also to ensure the quality of the cable, to create high-quality and inexpensive products.
Post time: Dec-19-2023