Theoretical background of balancing supply voltage and justification of structure of symmetrical unit for power supply of auxiliary motors of electric trains ER9M

摘要

The power supply voltage of auxiliary machines of multiple-unit train ER9M series is characterized by the considerable voltage asymmetry, especially in condition which differ from nominal. Emerging with additional overheating of the stator windings of auxiliary machines cause damage to their insulation and premature failure.Was made the analysis of the known methods of balancing the system of line voltages in order to find those that may be apply in the system of auxiliary motors of AC electric multiple-unit train. Was shown the possibility of balancing electric system AC line voltage of auxiliary machines by means of individual controlled capacitive units discret action. Was developed the structure of the capacitor units to provide power supply to auxiliary electric machines of multiple-unit train ER9M series, which would allow to maintain the allowable voltage unbalance factor of importance in a real operation, and was developed the method of determining the parameters of balancing elements of the named device.The study found that the required capacity of the capacitor banks must be 50 ... 1900 uF for full voltage balancing with the unbalance coefficient 2...14 percent? in the supply circuits of auxiliary machines.