A STUDY OF FAULT DIAGNOSIS IN DISTRIBUTION LINE BASED ON ROUGH SET THEORY
Hongchun Shu · Proceedings of the CSEE · 2001
Based on rough set theory, the paper proposes an new distribution network fault diagnosis approach to deal with the imperfect alarm signals, caused by malfunction or failing operation of protection relays and circuit breakers, error in the communication equipment. Due to rough set theory can effectively handle the imprecise problems without any ancestor information except the data set itself, a decision table including all kinds of fault cases is established by considering the signals of protection relays and circuit breakers. Then, diagnostic rules are extracted by reducing the decision table. Using the reducts of decision table, the diagnosis rules can be obtained directly from fault samples which have been established. The method can tell indispensable fault signals from the dispensable ones and discover the inherent redundancy of alarm signal set. Finally, a practical fault diagnosis program is proposed based on VC++6.0, with the main interface made by VB6.0. A lot of simulation results show that the method is quite efficient and has excellent fault-tolerance capability.