复杂和应涌流及其对电流差动保护的影响

目前大多数和应涌流机理分析采用运行变压器空载模型,对运行变压器非空载情况下的复杂和应涌流研究较为有限。文中推导了当一台变压器空投、另一台变压器非空载运行时,变压器磁链、电源电流以及运行变压器负载电流的解析表达式,分析了复杂和应涌流的影响因素、关键特征以及对相邻发电机电流差动保护的影响。数字仿真、动模试验以及现场录波数据验证了分析结论的正确性。

Complex Sympathetic Inrush and Its Influence on Current Differential Protection

Currently the analysis of sympathetic inrush mechanism is usually based on no-load operating transformers. The complex sympathetic inrush when a transformer operates with load is studied less often. The analytical expressions for the transformers flux linkages, the source and load current, when one no-load transformer is energized and the other is operating with load, are derived to obtain the influencing factors and key characteristics of the complex sympathetic inrush. Besides, the impact of sympathetic inrush on the current differential protection for generators is analyzed. Digital simulation, dynamic simulation test, and the on-site recorded data have proved the validity.