智能变电站继电保护二次回路分析与状态评估研究

Analysis and Condition Assessment Research on Secondary Circuit of Relay Protection in Smart Substation

智能变电站二次系统的数字化和网络化使继电保护的工作方式发生了极大的变化,而在新一代智能变电站建设中进一步实现了二次设备的在线监测功能。本文针对新一代智能变电站的新特点对继电保护二次回路做了简要分析,重点从硬件角度对其状态评估进行研究:分析合并单元、智能终端和光纤链路的故障类型,提出评价指标并分类,按指标类别对其数据处理方法进行分析,利用模糊灰色聚类建立状态评估模型;对评价原则进行分析和改进;将未确知有理数法和熵权法相结合,通过线性加权建立组合赋权法。最后,在算例中利用本文建立的评估模型对某二次回路进行状态评估,验证了方法的有效性。

Digitization and network of smart substation＇ s secondary system makes great changes in the working man- ner of relay protection, and the new generation of intelligent substation further realizes the on-line monitoring function of secondary equipment. The paper makes a brief analysis on the secondary circuit of relay protection based on the new features of the new generation of intelligent substation, and studies the state assessment mainly from the angle of hardware ： （ 1 ） The paper analysed the fauh type of merging unit,intelligent terminal, and optical fiber link, put for- ward and classified the evaluation indexes, analysed the data processing method by categories, and set up the state evaluation model by grey-fuzzy cluster analysis ; （2） Analyzed and improved the evaluation principles ; （3） Combined the unascertained rational number method and entropy weight method, and established the combination weighting method by linear weight. In addition, the paper makes a brief analysis on function test of the merging unit. Finally, the paper assesses a secondary circuit by the established state assessment method in an example to verify the validity of the method.