研究目的: 为解决电气化铁路尤其是山区电气化铁路中电分相带来的列车降速、失电、过电压和供电可靠性等问题,提出双边贯通供电系统的方式,使相邻两牵引变电所之间贯通连接,实现两所范围内接触网的贯通供电。而双边贯通供电方式下的牵引变电所保护配置方案与单边供电模式存在显著差异,对牵引变电所的主接线形式及运行方式以及牵引供电系统的可靠性有着重要影响。本文依托双边贯通供电试验项目,以110 kV牵引变电所为例,从双边贯通供电系统结构特点出发,对牵引变电所的保护配置方案进行研究。
研究结论: (1)双边贯通供电方式下,牵引变电所的馈线增加联跳保护;(2)双边贯通供电方式下,在牵引变电所内增加独立的27.5kV母线保护;(3)双边贯通供电方式下,牵引变电所的进线宜与地方变电所联合设置进线线路光纤差动保护;(4)本研究结论可为双边贯通供电技术的工程应用提供理论基础。

Research purposes: In order to solve the problems of train deceleration, power loss, overvoltage and power supply reliability caused by the phase splits of electrified railways, especially mountainous electrified railways, a bilateral interconnected power supply system was proposed, so that two adjacent traction substations can be connected to each other. Through connection between the groups, the in-phase power supply of the catenary within the group range was realized, which provided conditions for canceling the phase splits. However, there were significant differences between the protection configuration scheme of traction substations under the bilateral interconnected power supply mode and the unilateral power supply mode, which had an important impact on the main wiring form and operation mode of the traction substation and the reliability of the traction power supply system. In this paper, relied on the bilateral interconnected power supply test project, by 110 kV traction substation as an example, from the structural characteristics of the bilateral interconnected power supply system, the protection configuration scheme of the traction substation was studied.
Research conclusions: (1) In the bilateral interconnected power supply mode, the longitudinal protection was used on the feeder of the traction substation. (2) In the bilateral interconnected power supply mode, an independent 27.5 kV bus differential protection was used in the traction substation. (3) In the bilateral interconnected power supply mode, the incoming line of the traction substation should be combined with the local substation to set up the incoming line optical fiber differential protection. (4) The research conclusions can provide a theoretical basis for the engineering application of bilateral interconnected power supply technology.