中压真空断路器状态的雷达图法评估模型

Condition-Based Assessment Model of MV Vacuum Circuit Breaker With Radar Chart Method

电力设备健康状态的全面在线评估是平衡经济性和可靠性的最佳策略。建立中压真空断路器的评估模型:通过分析断路器各主要组成部分的故障特征,构建健康性能评估指标集;定义完好度概念,进行指标的归一化处理;剖析指标的耦合关系,采用层次分析法确定指标权重;引入熵值法,量化指标劣化的非同步性;建立一种基于雷达图法的图形化状态评估方法,并在定量计算中引入参考样本和指标不平衡值,特别是参考样本区间的设计纳入指标的劣化速度特征,确保了劣化预警的充裕性和及时性。10 kV真空断路安全状态评估表明,该模型简单、直观、实用性强。

The overall online healthy assessment is the best strategy for the balance between the economy and the reliability of power equipment,this paper focuses on the online healthy condition-based assessment model of the medium voltage（MV） vacuum circuit breakers（VCB）.Various performance indices are firstly proposed to assess the VCB’s condition by analyzing the fault characteristics of its main components.Then,the perfection degree is defined to make the sampling data normalized.Based on indices coupling relationships,the weights are determined with analytic hierarchy process（AHP）.The entropy is employed to quantify the nonequilibrium impairment of all indices.Finally,an improved radar chart method with eigenvalue calculating algorithm is applied to the VCB’s condition assessment.In the method,the reference samples considering the impairment speed in thresholds design,especially the nonequilibrium entropy are incorporated to ensure VCB’s safety early warning adequately and timely.The test results on monitoring 10 kV VCB show that the model is concise,intuitive and feasible.