中文摘要：

随着信息技术的发展，智能电网成为我国电力技术改革的重点。目前，变电站保护装置仍采用传统判据和原理，保护存在缺陷性，实现变电站智能信息化迫在眉睫。基于国内外研究现状，首先研究了智能变电站体系结构特点，借鉴电流差动保护原理，提出了新型站域主保护算法，通过判断保护区制动状态和差动状态实现智能变电站故障定位和诊断，并采用仿真软件验证了算法的计算精度。研究表明：新型站域主保护算法可以正确判断故障状态，对变电站智能化改造具有一定指导意义。

英文摘要：

With the development of information technology, smart grid has become the focus of power technology reform in China. At present, the substation protection device is still using the traditional criteria and principles. The protection of the existence was defective, realizing the intelligent information was imminent. Based on the research status at home and abroad, firstly, the characteristics of smart substation system were studied, and a new type of main protection algorithm was proposed based on current differential protection principle. The fault location and diagnosis of intelligent substation were realized by judging the braking state and differential status of protected area. And the simulation software was used to verify the accuracy of the algorithm. The study shows that the new type of station domain main protection algorithm can correctly judge the fault state, which has a certain guiding significance for the substation intelligent transformation.