S-bond型轨道电路传输特性分析

Analysis of Transmission Characteristics of S-bond Track Circuit

上海城市轨道交通地铁2号线采用美国联合道岔与信号国际公司(USSI)提供的数字轨道电路AF 904.通过分解电气绝缘中的钢轨、信号环线、阻抗连接器(S-bond)各部分元素,对轨道电路的传输特性进行了演算和分析.分析表明,阻抗连接器对于轨道电路具有较强的方向性.根据传输特性,提出了日常维护建议.

The digital track circuit AF904 supplied by USSI（America） is used in Shanghai Metro Line 2.Important components in the electrical insulation system such as electric insulating rail,signal loop and impedance connector（S-bond） were decomposed,then the calculation and analysis were conducted for track circuits transmission characteristics.The analysis shows that track circuit S-bond has a strong directionality.According to the transmission characteristics,proposals for daily maintenance are given.