A logic programming approach to fault diagnosis in distribution ring networks

Abstract

Abstract The prime objective in the operation of a distribution system is to supply power to the customers and to meet their load demands. Whilst the probability of fault in high voltage and extra high voltage networks is low, the chance of fault in distribution networks is relatively high. When a fault occurs in a distribution network, it must be identified and removed immediately so that power can be restored as soon as possible. This paper develops a logic model for diagnosing faults in distribution ring networks. Methods in the model for representing network configurations, faults, symptoms of faults and defects are presented. Fault-finding rules are developed from the relations between the faults and their symptoms, including the effects of hidden defects due to battery failures and open-circuited pilot-wire circuits in the feeder protection systems. A logic program is developed based on the logic model and it is implemented by a goal-directed language, Prolog. The power of the logic program system for fault diagnosis is demonstrated through its application to an 11 kV distribution network.