Abstract
Rapid and correct fault section estimation is vital for power system restoration. This is particularly true for complicated multiple faults. This paper presents an expert system for power system fault section estimation using information including operating times of actuated relays and tripped circuit breakers. The inference is executed by transmitting timed-event markers in the cause-effect network proposed in an earlier paper. Since the proposed system can handle information on the operations of relays and circuit breakers with the aid of time sequence information, it can infer fault sections correctly even for complicated multiple faults. In addition, since the number of generated fault section candidates can be decreased, the inference speed is improved significantly. The proposed system has been tested for two examples. It has been shown that the inference speed and accuracy of the method proposed in this paper are much better than those of the one proposed earlier which does not use time information. The inference speed is also fast enough for real-time use.
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