winding current
4.In accordance with the driving characteristics of AC driving locomotive,the working status of its traction transformer is analysed.The questions that should be considered in the traction transformer design of AC driving locomotive are mentioned.These questions are the large short-circuit impedance of traction winding,higher harmonic current,over-excitation and DC magnetization caused by large variation of the network voltage,etc.Some disposal methods are given.
5.When wound-rotor induction motor is operated at over speed driven by induction motor and its rotor winding is excited by altemating current with working frequency higer frequency altemating volage can be produced. This princigle is used to form M-G AC generator set with fixed frequency of 150Hz. The penerator set is used to carry out over speed and over voltage texting of YZ, YZR rang motors.
6.The author points out that the different results are caused by the slightly different 100-winding hank number per cocoon. Therefore, propo sals are made for revising the current calculation formula.

