低碳背景下低压电动机电缆选型思路

The Idea of Low-Voltage Motor Cable Selection Under the Background of Low Carbon

目前低压电动机配电使用的4芯电缆比3芯电缆多出的1芯PE线在实际工程中往往并未发挥作用。GB 50217—2018《电力工程电缆设计标准》的实施首次提出了TN-S系统低压电动机配电宜选用3芯电缆的表述。通过解析新规范内容,结合实例对目前主流的低压电动机配电电缆的选型方案进行了对比分析,指出在合规和满足适用需求的情况下合理选用电缆,可实现节能和环保。

At present,there are two situations of using 4-core cable and 3-core cable for low-voltage motor power distribution,and the 1-core PE line with more than 4-core cable than 3-core cable often does not play a role in actual engineering.The implementation of GB 50217—2018“Code for Design of Cables of Electric Engineering”for the first time put the statement that 3-core cables should be selected for the distribution of low-voltage motors in TN-S systems.By analyzing the content of the new specification,combined with examples,the current mainstream selection schemes of low-voltage motor distribution cables are compared and analyzed,and it is pointed out that reasonable selection of cables under the condition of compliance and meeting applicable requirements can achieve energy saving and environmental protection.