贯通式同相AT牵引供电系统牵引网边界频率特性研究

分析贯通式同相自耦变压器(AT)牵引供电系统及由牵引变电所出口处电容和区外一段接触线构成的牵引网边界频域特性,分析牵引网及边界对高频暂态信号的衰减作用及故障位置对保护安装处检测到的高频暂态信号的影响.研究结果表明,在现行贯通式同相AT牵引供电系统中,牵引网对高频暂态量的衰减作用小于边界对其的衰减作用;保护安装点检测到的高频暂态量与故障发生的位置密切相关.建立仿真模型对贯通式同相AT牵引供电系统牵引网及边界的对高频暂态量的衰减作用进行验证,仿真结果验证了研究结果的正确性.

Boundary frequency characteristic study of traction network in continuous co-phase AT traction power supply system

The boundary frequency characteristics of continuous co-phase AT(AutoTransformer) traction power supply system and the traction network composed of the capacitor at the exit of the traction substation and a section of catenary line outside the traction network are analyzed. The attenuation effect of traction network and traction network boundary on high-frequency transient signals, and the impact of fault location on high-frequency transient signals detected at protection are analyzed. The study results show that in the current continuous co-phase AT traction power supply system, the attenuation effect of the traction network on the high-frequency transients is smaller than that of the traction network boundary, and the high-frequency transient signals detected by the protection are closely related to the fault location. A simulation model is established to verify the attenuation effects of the traction network of the continuous co-phase AT traction power supply system and the traction network boundary, and the simulative results verify the correctness of the study results.