数字化变压器保护电子式互感器的应用与研究

Application and Research of the Electronic Transformer for the Digital Transformer Protection

目前的数字化变电站在基于电子式互感器变压器保护应用领域的通用做法是在传统保护的基础上增加数字通道的自检来对数据源的错误标志进行分析,并没有采取一些相应的措施来针对通道错误情况下处理机制,缺少与电子式互感器技术特点相关的变压器保护的新的原理。介绍了电子式互感器的分类、技术原理、应用数学模型及特性,分析了传统变压器保护和基于电子式互感器应用的数字化变压器保护在采样异常处理、区内外故障识别及涌流判断与闭锁等方面的不同,并进一步提出基于电子式互感器的数字化变压器保护装置的错误处理机制以及新的算法,以达到数字化变电站变压器保护全面推广应用的目的。

The general method for digital substations in the applications of electronic transformer and transformer protection is adding the self-check for the digital channel, and analyzing the error flag of the data source, but the corresponding measures for the channels error handing and the new principle of the electronic transformer and transformer protection has not yet been achieved. In this paper, the classification, technical principles, application mathematical model and characteristics of electronic transformer are introduced. Analysis is carried out on the difference of the sampling abnormity handling, internal and external fault recognition, judgment and locking of inrush current between traditional transformer protection and transformer protection with electronic transformer, and further, the error handling mechanism and algorithm of the electronic transformer and transformer protection are put forward to help realizing the comprehensive application of digital substation transformer protection.