1短路故障及其原因分析铝护套型铁路信号电缆因其良好的屏蔽性能多用作铁路电气化区段的干线或强电干扰地区的信号线[1-2]。图1示出了典型的铝护套型铁路信号电缆的结构,其中为了提高电缆的防腐性以及防护铝护套和铠装层,在铝护套外均匀涂覆了热熔胶或其他防腐材料,再挤包一层最小厚度为1.0 mm的塑料垫层(即内衬层)。在铝护套和铠装钢带之间的内衬 A short-circuit fault and its reasons Analysis of aluminum sheathing type of railway signal cable because of its good shielding performance and more for the railway electrification section of the trunk or strong electrical interference area signal line [1-2]. Figure 1 shows the structure of a typical aluminum sheathed railway signal cable in which hot-melt glue or other antiseptic material is uniformly applied outside the aluminum sheath in order to improve the corrosion resistance of the cable and to protect the aluminum sheath and the armor layer , And then squeeze a layer of plastic cushion (ie, the inner liner) with a minimum thickness of 1.0 mm. Lining between aluminum sheathed and armored strip