Abstract:

Abstract:Combining the factory experimental data of high voltage auxiliary transformer of a 600 MW unit and asynchronous motor parameters that 6 kV auxiliary bus connected,this paper calculated and compared the initial values of three phase short circuit current of the 6kV auxiliary bus using equivalent voltage source method and traditional method,respectively.In the calculations above,the feed network impedance on the high voltage side of high voltage auxiliary transformer is supposed to be 0.The calculations show that the average calculated values of short circuit current that provided by auxiliary power supply branch are very close to each other between equivalent voltage source method and traditional method.

Key words: ">Keywords:">600 ">MW unit, equivalent voltage source me thod, auxiliarybus, short circuit current calculation