A SIMPLIFIED FAULT CURRENTS ANALYSIS METHOD CONSIDERING TRANSIENT OF SYNCHRONOUS MACHINE

The transient fault currents for a synchronous machine fault were math matically analyzed by using the two-reaction theory, Clarke's componen ts, etc. However, the methods were extremely complicated and the trans ient fault analysis of synchronous machine with a load was not carried out except for three-phase fault. This paper proposes a simplified fa ult currents analysis method considering transient of synchronous mach ine. The method is based on the symmetrical-components. The advantages of the method are that the transient analysis is able to be accomplis hed more easily than the conventional method when the fault point is a synchronous machine terminal or a transmission line. The accuracy of the method is confirmed by comparing the analysis results with the Ele ctro-Magnetic Transient Program (EMTP) digital simulations.