The invention belongs to the field of
electric power systems, and particularly relates to a method for evaluating
relay protection states. The method includes the steps: firstly, determining single state quantities of state evaluation to acquire acquisition; secondly, building a hierarchical state
evaluation system; thirdly, computing constant weight coefficients and
variable weight coefficients of the single state quantities according to association rules and
variable weight theories; fourthly, building membership functions of the single state quantities for state rates by a fuzzy
distribution method, building a
fuzzy relation matrix, and gradually computing fuzzy comprehensive
evaluation result vectors; finally, judging the running state of a
relay protection device according to a maximum membership principle. The influence of
expert opinion subjectivity on the weight coefficients is avoided, the method contributes to solving the problem that a real running state of the
relay protection device cannot be reflected by the constant weight coefficients, an accurate and simple relay protection state
evaluation result is provided for operators and can serve as a state maintenance basis, the
design thinking is clear,
programming is easily realized, and
transplantation between different
programming environments is facilitated.