Railway balance traction transformer is the main transformer in the traction substation of railway electrification.

It can suit for traction electrification performance characters, such as short-time serious over-load, 3-phase unbalanced load, frequent close to earth short-circuit, etc. It has the distinguishing features of low loss, high mechanical strength, simple constructure, convenient manufacture.

Because of traction transformer's long working in no-load condition, the proportion of no-load loss to load loss is selected reasonable in order to be in transformer economic performance during designing.