Development of Expert System for Estimating Causes of Fault on Power Transmission Lines

Abstract

When a fault occurs in power transmission lines, we have to take proper measures depending on the cause and degree promptly. Now many excellent men have to be reared and engaged in the main-tenance work. A system to make the work efficient and speedy is thus expected. To achieve above, it is necessary to estimate the causes and places quickly and precisely. We studied on the fea-sibility of an expert system to assist the maintenance work. First, we surveyed the relationship between causes of faults in the past and their corresponding information such as substation's records, meteorological conditions, geographical features and so on. Then we built up an expert system using the past 5 years' data and evaluated it using the other past 2 years' data. As a result, correct answer rate with the first candidates of fault causes was 96% for lightning, and more than 80% for snow or wind. Also, when the second candidates are included, the correct answer rate turned to be more than 80% for birds, nests, snakes or monkeys. These evaluation expects the effectiveness of our system in actual power transmission lines.