导体温度对低压动力电缆电阻的影响  

EFFECT OF CONDUCTOR TEMPERATURE ON RESIS-TANCE OF LOW-VOLTAGE POWER CABLE

作　　者：李玲 Li Ling(SINOPEC Engineering Incorporation,Beijing,100101)

机构地区：[1]中国石化工程建设有限公司,北京100101

出　　处：《石油化工设计》2023年第2期10-14,20,I0001,共7页Petrochemical Design

摘　　要：对低压动力电缆选择计算中容易忽视的要点进行了探讨、分析,指出了导体阻抗计算中直流电阻和交流电阻的关系,强调了应根据电气保护校核电缆截面;以炼化企业常用的交流聚乙烯绝缘电缆为例,给出了电缆导体最高允许温度、建议的实际工作温度;同时介绍了一种短路时导体假设计算温度的计算方式,并通过计算,给出了低压回路动力电缆短路时导体假设计算温度和电阻值的变化趋势。This paper discusses and analyzes the key points which may be easily ignored in the selection and calculation of low-voltage power cable,points out the relation between DC resistance and AC resistance in the calculation of conductor impedance,and emphasizes that the cable cross-section shall be verified by electrical protection.Taking the widely used XLPE insulated cable as an example,this paper specifies the maximum conductor temperatures and the recommended actual working temperature.This paper also introduces a calculation method for the assumed temperature in case of short circuit of conductor,and gives the trends of the calculated assumed temperature of conductor and the relevant resistances in case of short circuit of low-voltage power cables.

关 键 词：电缆和导体 导体的直流电阻和交流电阻 导体最高允许温度 导体实际工作温度 导体短路时假设温度的计算 导体短路时的电阻值 低压回路末端短路电流 

分 类 号：TE683[石油与天然气工程—油气加工工程]