贯通式同相牵引直接供电系统牵引网边界频率特性研究

分析贯通式同相牵引直接供电系统牵引网及其边界的频率特性。利用牵引网的频域模型,全面分析牵引网频率特性;由牵引变电所与线路的联接方式,提出“牵引网边界”的概念,指出“牵引网边界”由牵引变电所出口处的电容和外侧一段线路组成。分析牵引网和边界对故障暂态分量的衰减特性发现:暂态高频信号在经过牵引网及其边界时都会衰减;牵引网越长,高频暂态量的衰减作用越明显;由于牵引变电所之间的距离较短,牵引网边界对高频量的衰减总大于牵引网的衰减作用。

Research on traction network and boundary frequency characteristics of cophase traction direct power supply system

The frequency characteristics of the traction network and its boundary of the cophase traction direct power supply system were analyzed.The paper applied frequency domain model of the traction network to analyze the frequency characteristics of the traction network transmission line.The concept of“traction network boundary”was proposed based on the connection mode between the traction substation and the line.The“traction network boundary”by the capacitance at traction substation exit and the outer line were composed.Discussing the attenuation characteristics of traction network lines and line boundary to fault transient components,the following results are obtained.The transient components of high frequency will attenuate as they through the traction network line and its boundary.The attenuation of high frequency of transient components is obvious as the line longer.The attenuation of high frequency by the boundary of the traction network is always greater than the attenuation of the traction network because the distance between the substations is short.