通信电缆理想屏蔽系数的试验测定及影响因素分析

本文通过对不同结构形式组成电缆屏蔽层的通信电缆理想屏蔽系数测定,得出理想屏蔽系数曲线图,解析出不同材质、不同屏蔽材料厚度、不同钢带磁导率对通信电缆屏蔽系数的影响,分析出铝管护套厚度增加,电缆的屏蔽性能提高;磁导率高的钢带屏蔽作用比普通钢带的屏蔽作用好,这一实验结果为理想屏蔽系数要求高的通信电缆设计及技术提供数据支持。而且通过理想屏蔽系数与护套电压曲线的解析,对市场上一些电缆的理想屏蔽系数要求和工厂产品的参数有一个基本的判研,从而选择合适的屏蔽钢带类型和铝管厚度,控制屏蔽系数性能,从根本上解决了通信电缆理想屏蔽系数不达预期的难题。

In this paper,by measuring the ideal shielding coefficient of communication cable with different structure forms of cable shielding layer,the ideal shielding coefficient curve is obtained.The influence of different materials,different shielding material thickness and different steel strip permeability on the shielding coefficient of communication cable is analyzed,and the shielding performance of cable is improved with the increase of the thickness of aluminum tube sheath.The shielding effect of steel tape with high permeability is better than that of ordinary steel tape.This experimental result provides data support for the design and technology of communication cable with high requirement of ideal shielding coefficient.And through the analysis of the ideal shielding coefficient and sheath voltage curve,the requirements of the ideal shielding coefficient of some cables on the market and the parameters of factory products have a basic evaluation,so as to select the appropriate shielding steel strip type and aluminum tube thickness,control the shielding coefficient performance,fundamentally solve the problem that the ideal shielding coefficient of communication cable is not up to the expectation.