Based on the characterization that the time constants of the distant short-circuit fault currents exhibit a time varying due to the skin effect of the track,a novel method using Mexican hat wavelet transform to distinguish the distant fault current and the train starting current is proposed in this paper.

Automatic diagnosis system for monitoring short circuit malfunction of electric net in oilfield;

Research on overvoltage output of SPWM inverter after short-circuit fault disappears in a short time;

The mathematical model for the short-circuit fault analysis and the realization of the program is discussed.

The current signals caused by lightning strike without any fault or with fault and by common short-circuit fault are analyzed,and the characteristics are obtained: firstly,energy distributions of all frequency bands are differ.

The performance of STATCOM using optimal controller at short circuit fault and load step is compared with its performance when PI controller is adopted,and its affection to the voltage and reactive power is analyzed through simulation.

With increase of the capacity of power system,transformer faults caused by short circuit fault occurred now and then.

In view of the trouble that short circuit occurred frequently in 110kV transfer substation,the method that uses change of 10kV side current of the main transfer substation to calculate the current of short circuit and infer accurate trouble point position and remove the trouble rapidly has been found out in practice to recover power supply.

On MATLAB simulation flat,after introducing the basic components,we can get ideal simulation results by designing,simulating and analyzing short circuit fault of a simple power system transmission line.