Research on Online Monitoring Technology of Disconnector based on IEC 61850 Model Improved

High voltage disconnectors are important conducting equipment in substations. They run outdoors mostly and are exposed to rain and sunshine every day. The disconnectors are prone to problems such as corrosion of components and jamming of control operation, which endanger the operation safety of power grid. Recently, the rapid development of Internet of things and digital technology provides an opportunity for the digital application of disconnector monitoring, while the monitoring data is the base of implementation. At present, the monitoring model is the general model without clear semantic expression, and only models the equipment itself, which can't support multi-dimensional analysis and display. Based on IEC 61850 model and the advantages of common information model, the paper expands the online monitoring model of disconnector and station geographical region model. It constructs the logical relation model of among station geographical region cabinet and online monitoring device, and between disconnector and online monitoring device, which provides a model basis for all-round monitoring and supports the applications of digital twin technology and three-dimensional display technology in equipment online monitoring.