三相V,v接线和单相I,i接线牵引变压器的组合应用

对某既有电气化铁路增建四线工程中一个110kV单相牵引变电所的扩能改建方案进行了深入研究,通过对不同牵引变压器接线型式与既有单相I,i接线牵引变压器的组合效果进行静态和动态比较后提出了利用三相V,v接线和单相I,i接线牵引变压器构成组合三相平衡接线来降低电气化铁道牵引负荷对电力系统的负序影响、充分利用供电能力的技术方案。这种组合接线的应用,既能降低对电力系统短路容量的要求,又增大了对不平衡牵引负荷的负载能力。对既有电气化铁路增建新线工程以及铁路枢纽的牵引供电系统设计具有参考价值。

Combined Application of Three-phase V,v Connection and Single-phase I,i Connection Traction Transformer

The expansion schemes of an 110 kV single-phase traction substation in an additional four-track construction project of an existed electrified railway line are studied.The static and dynamic comparisons among the effects of coordination between different traction transformer connection modes and the existing single-phase I,i traction transformer are made.Then the combined application of the three-phase V,v connection and the single-phase I,i connection of the traction transformer is recommended to reduce the negative phase sequence influence of the traction loads on the paver supply systems of electrified railway lines.This combined three-phase balance connection can reduce the capacity demand of utilities and increase the supply capability of imbalance traction substations.This combined balance scheme will be of reference value to design of traction power supply systems for railway terminals and additional new lines of electrified railways.