变压器涌流识别技术的研究现状及趋势

Research Status Quo and Trend of Transformer Inrush Current Identification Technology

首先阐述了变压器励磁涌流及和应涌流的产生机理,通过建立相关模型分析空载合闸时变压器之间的磁链关系,指出和应涌流的存在会减慢励磁涌流的衰减速度,而励磁涌流产生的偏磁是产生和应涌流的根本原因;然后研究当今主要涌流识别技术的优缺点及其适用性,指出为了提高变压器保护的动作正确率,需要对传统的方法进行改良或者采用新的涌流识别技术。

This paper states producing mechanism of excitation inrush current and sympathetic inrush current of transformer. By establishing related model, it analyzes flux relationship of transformers when no-load closing happens and points out ex- istence of sympathetic inrush current may cause reduction of decay speed of excitation inrush current while the basic reason for producing sympathetic inrush current is bias magnet produced by excitation inrush current. It studies merits and demerits and applicability of present main inrush current identification technologies. In addition, it points out that for improving ac- tion accuracy of transformer protection, it is necessary to improve traditional method or use new inrush current identifica- tion technologies.