摘要
系统恢复初期,在空充主变的过程中由于其饱和导致和应涌流现象。针对该问题,从并联的两台变压器磁链解析式与和应涌流的积分表达式出发,指出和应涌流主要是由并联变压器公共点处电压的突变造成运行变压器的磁链改变而产生的,其大小由并联公共点处电压在一个周期内的积分值决定。然后深入分析了系统阻抗、运行变压器所带负荷量及负荷功率因数对和应涌流产生的影响。利用计算机仿真验证了分析的结论,为正确认识系统恢复初期和应涌流现象提供了有益的结论与参考。
In the initial period of power system restoration, the sympathetic inrush current will appear as a result of the saturation when charging no-load transformer. Based on the mathematical representations of flux linkage and the integral model of sympathetic inrush of two shunt-wound transforms in initial period of power system restoration, this paper indicates that sympathetic inrush is generated through the change of linkage of running transformer by sudden change of public bus voltage in two shunt-wound transformers. The sympathetic inrush value is decided by the integral value of public bus voltage in a period. Then the influence of system impedance, load capacity and load power factor that has been restored on sympathetic inrush current is analyzed in-depth. The analytical results are tested and verified by computer simulation and useful conclusion and reference are provided for estimating sympathetic inrush current.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第14期44-50,共7页
Power System Protection and Control
基金
四川大学青年教师科研启动基金(2012SCU11005)
关键词
恢复初期
和应涌流
变压器
系统阻抗
负荷量
负荷功率因数
initial period of restoration
sympathetic inrush
transformer： system impedance
load capacity
load power factor
