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研究目的:电气化铁道是单相移动牵引负荷,会造成电力系统三相负荷的不平衡,对不平衡产生的负序电流问题,需探讨减小负序电流的措施,尽量减小牵引负荷对电力系统的负序影响。研究结论:电气化铁道牵引变电所普遍采用换相联接的供电方式——轮换接入电力系统中的不同相。本文对电气化铁道牵引变电所采用单相结线、单相V,v结线、三相V,v结线、三相YN,d11结线、三相-两相平衡结线、三相V,x结线等牵引变压器的端子标志及联接进行了论述和总结,对牵引变电所采用各种牵引变压器的换相联接方式进行了分析研究,提出了客运专线采用AT供电方式时,单相或单相V,x结线的变压器端子标志、联接方案及牵引变电所换相联接的推荐方案。采用该方案可以简化牵引变电所牵引变压器一次侧高压线路的接线,避免高压侧线路出现交叉连接,同时简化了牵引变电所的平面布置,节约了投资。
Research purposes: Electrified railway is a single phase traction load, will cause the imbalance of three-phase load in power system. To solve the problem of negative sequence current caused by unbalance, it is necessary to discuss the measures to reduce the negative sequence current to minimize the influence of traction load on power Negative sequence effects of the system. Research conclusions: The electrified railway traction substation generally adopts the power supply mode of commutation connection - alternating the different phases in the power system. In this paper, electrified railway traction substation using single-phase connection, single-phase V, v connection, three-phase V, v connection, three-phase YN, d11 junction, three-phase - two-phase balanced junction, , x knot and other terminals of the traction transformer terminal signs and connections were discussed and summarized the traction substation traction converter used in a variety of phase-change connection were analyzed and proposed passenger dedicated line AT power supply mode, the single-phase Or single-phase V, x wire terminal transformer terminal logo, connection scheme and the traction substation commutation recommended scheme. The scheme can simplify the wiring of the primary side high voltage line of the traction transformer in the traction substation, avoid the cross connection of the high voltage side line, simplify the layout of the traction substation and save the investment.