Substation secondary equipment fault diagnosis method and system

The invention belongs to the field of intelligent substations, and discloses a substation secondary equipment fault diagnosis method and system which are applied to a three-layer two-network structure of an intelligent substation, and the method comprises the steps: building a simple fault information feature set and a complex fault information feature set in a GOOSE link and an SV link of the intelligent substation; establishing a simple fault diagnosis model by applying an expert system knowledge base; and constructing a BAS-SVM model, and training the BAS-SVM model by using the complex fault information feature set to obtain an optimal BAS-SVM complex fault diagnosis model. And performing fault diagnosis by using the two fault diagnosis models. According to the method, simple faults and complex faults are considered and are respectively diagnosed, so that the diagnosis efficiency is improved. 本发明属于智能变电站领域，公开了一种变电站二次设备故障诊断方法及系统，应用于智能变电站三层两网结构，本方法包括：建立智能变电站GOOSE链路和SV链路中的简单故障信息特征集合和复杂故障信息特征集合；运用专家系统知识库，建立简单故障