Abstract
This paper presents a new real-time method for locating fault section at substations. When a fault occurs, a lot of information resulting from protective relay operation and cricuit breaker operation is recorded. Using this information we tried to locate the fault section, especially by considering the sequential relationship of the information and by dividing fault ares. Primarly, in this method, the fault area is divided into several sections based on protection area and operation time of protective relays. Next, expecting subsequent operation of backup relays, “waiting time” for reasoning is given to each divided section. After a lapse of “wating time”, all of the suspected fault sections are extracted and given priority based on empirical knowledge of experts. We developed a prototype of the expert system for fault section location, which was applied to various complicatted fault cases. We proved the effectiveness of our method even in case of multiple faults and no-operation of protective relays and circuit breakers.
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