变电站规范模型文件（system specification description，SSD）用于描述变电站的主接线图以及与主接线图相匹配的逻辑功能节点。基于对SSD模型和变电站主接线图之间映射关系的研究，实现了利用可伸缩矢量图形技术（scalable vector graphics，SVG）生成SSD模型中包含的变电站主接线图的图形构建技术。

The system specification description（SSD） is used to describe main wiring diagram and the matched logic node of substation. Based on the mapping relationship between the SSD model and the main wiring diagram of substation,the construction technology of the substation wiring diagram contained in SSD model is carried out by the scalable vector graphics（SVG） technology.