220 kV三相V/V接线一体化牵引变压器的研究及应用

通过分析电气化铁路牵引变压器的单相接线和三相V/V 接线的原理, 指出后者可以降低电网的三相不平衡度。结合浙赣铁路电气化外部供电方案的研究, 对牵引变电所接入系统后的公共连接点在系统多种运行方式下的三相电压不平衡度进行了计算。针对公共连接点三相电压不平衡度超出国标的情况, 提出采用220 kV 三相V/V 接线一体化牵引变压器来降低三相电压不平衡度的方案, 并在浙赣电气化铁路中进行应用, 解决了重载铁路三相供电不平衡问题。

Research and Application of 220 kV Three-Phase V/V Connected Integrated Traction Transformer

Through analyzing principles of electric railway traction transformer single-phase and three-phase V/V connections,it is pointed out that the latter can reduce power grid three-phase voltage imbalance.Combining Zhe-Gan electric railway external power supply scheme study,common connector three-phase voltage imbalance after traction substations have been connected to the system under multiple operation modes is calculated.Aiming at the problem that common connector three-phase voltage imbalance exceeds the national standard,a new scheme that uses 220 kV three-phase V/V connected integrated traction transformer to reduce three-phase voltage imbalance is proposed.This scheme was applied in Zhe-Gan electric railway project and solved heavy load railway imbalanced three-phase power supply problem.