大容量变压器应用时的问题及应对措施

现代城市电网的建设和发展,使得在高负荷密度的大城市采用大容量变压器建设大容量变电站成为一种趋势。分析了采用1 500 MVA 大容量变压器建设500 kV 大容量变电站时引起的问题：（1）电气主接线复杂；（2）短路电流增大；（3）变电站220 kV 母线通流容量大；（4）变压器中压侧额定电流增大；（5）变压器中压侧断路器选择困难，并分别给出了解决方案。

Problems in Application of Large Capacity Transformers and Its Countermeasures

As the construction and development of modern urban grids expand,building large substations with large capacity transformers become a trend in urban cities with high load density.Following problems in application of 1 500 MVA transformers in 500 kV substations are analyzed:(1) complex electrical main connection;(2) increased short circuit current;(3) large flow capacity of 220 kV bus at substations;(4) increased rated current on transformer medium voltage side;(5) hard to choose transformer medium voltage side breaker,etc.Solutions to these problems are also presented.