That communication of substation secondary system is networked provides new monitoring method for operation and maintenance of secondary system. The monitoring platform can collect secondary system state data of substation from network and realize the goal of online real-time monitoring on operation condition of secondary system. This paper first analyzes modeling objects of secondary system state data of substation and builds secondary system state data of substation model based on object-oriented real-time database according to the model. And the modeling content of alarm information classified is emphasized in the model. The paper briefly introduces two application thoughts in condition assessment of secondary system and new fault diagnosis method of secondary system based on information redundancy on the basis of the advantage and characters of the model and provides practical research direction for engineering application of the model.%变电站二次系统智能化、网络化为二次系统运维提供了新的监控方式，监控后台能够通过网络收集变电站二次系统状态数据，实现在线实时监测二次系统运行工况的目标。首先分析梳理变电站二次系统状态数据的建模对象，依此建立基于面向对象的实时数据库的变电站二次系统状态数据模型。进一步，在分析二次系统状态数据模型的优势和特点的基础上，研究了状态数据模型在二次系统状态评估和基于信息冗余的新型二次系统故障诊断方法的两种应用思路，为模型的工程应用提供了实用的研究方向。
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