Research On The Cause Of Type HXD1C Lecomotive Auxiliary Inverter’s Output To Ground Voltage Raise

With the speeding up of the development of high-power electric locomotive localization, by digesting and absorbing foreign technology, an Electric Locomotive Co., Ltd. Of CSR has developed the HXD1C electric locomotive whose localization rate has been ninety percents.It has the milestone significance.The first batch has been delivered to a bureau of Chengdu Railway Locomotive,as the main models to undertake this freight locomotives task.But the first batch of HXD1C locomotives have many accidents when working,especially auxiliary system load fan burning accidents,which makes the locomotives of this type stop for a time.At present.this batch of locomotives’fans are insulation with ground by insulation materials.Although it can work normally,but the reason that the voltage of fan winding to ground raised hasn’t been found, and pose a safety hazard.Firstly,this paper introduces the auxiliary circuit system and describes the phenomenon of the fault. According to the circuit diagram by modeling and simulation in Simulink,we can get simulation waveforms same as field measured,proved the correctness of this simulation model.Then,analysis each circuit state of rectifier and inverter module in current transformer.Through analysising the data of rectifier and inverter on each switch tube’s on and off modules,compare the voltage of fan winding to ground when single current transformer works and both two work,then find and explain the reasons for this phenomenon.According to the reason,put forward 2 solution program.Verify the effect of the two kinds of schemes by simulation,then proves that both these two schemes can solve the fault.In addition,analysis the advantages and disadvantages of these two schemes.