Fuzzy Comprehensive State Evaluation Method of Filter Circuit Breaker Based on Field Operation Data

This study focuses on an 800 kV Filter Circuit Breaker (FCB) equipped with phase-controlled closing. The real-time health status of the circuit breaker was evaluated by analyzing the factors influencing its condition based on field-operation data. Key performance parameters, including mechanical characteristics, switching performance, and insulation properties, were employed for the assessment. Furthermore, field operation data are preprocessed to establish a comprehensive database that integrates data from C2-class margin tests, phase-controlled switching tests, and phase-controlled closing factory tests. A combined subjective–objective weighting method is applied to assign weights to health impact factors, and an improved fuzzy comprehensive evaluation method incorporating field operation data is proposed. Based on this evaluation, different operation and maintenance strategies were formulated. The results demonstrate that the proposed method enables a comprehensive and accurate assessment of the health status of FCBs, offering a reliable framework for optimizing condition-based maintenance in practical engineering applications.