复杂和应涌流及其对保护影响的研究

Research on Complex Sympathetic Inrush and its Influence on Relay Protection

通过Matlab仿真模拟串并联两种情况下和应涌流的产生及部分影响因素,分析运行变压器空载、满载和轻载情况下并联和应涌流的变化,指出应注意运行变压器轻载情况下和应涌流对差动保护的影响;对串并联两种情况下变压器之间联系电阻对和应涌流的影响进行了分析比较,同时分析了在混联的复杂情况下线路电阻对串并联和应涌流的影响,指出在实际中线路后边的并联变压器和应涌流应当引起足够重视。

By simulating the generating process and part of the influencing factors of sympathetic inrush caused by trans- formers both in series and in parallel with MATLAB, the paper analyzes the sympathetic inrush changes in operating trans- former with empty, full and light load and its influence on differ- ential protection, then points out that attention should be paid to the situation of light load. Then it compares the influence of connect resistance to sympathetic inrush in two cases. In addi- tion, the analysis shows the influence caused by line resistance in complex situation and points out the parallel transformer be- hind the line should be taken into account in practice.