Fault model based on H-C model in the system of traction power supply

There exist bigger error of fault model and few examining data in traction power supply system. A novel way to model fault for few data is advanced, its parameter is estimated by maximum likelihood criterion and the model is optimized via least square law. The model solves effectively the problem that modeling few data in traction power supply system relies big swatch theory, and the model of fault data of the contact net in railway is built. By fitting result, it is proved that the precision of fitting data is bigger improved.