铁心电抗器零序磁通量产生的仿真分析

Simulation Analysis of Zero Sequence Magnetic Flux Generation of Iron Core Reactor

本文基于一台35kV低抗产品,建立了电抗器铁心非线性模型,利用EMTP-ATP仿真了电抗器投入运行时的电磁暂态过程,分析了初始合闸电压相角、断路器的合闸分散性以及环境温度对电抗器铁心零序磁通量产生的影响。仿真结果表明,铁心电抗器在投入运行时会产生幅值较高的零序磁通分量,将使铁轭、夹件等钢性结构件上聚集较高的磁密,产生附加涡流损耗。

Based on a 35KV low reactance product,the nonlinear model of reactor core is established.The electromagnetic transient process when the reactor is put into operation is simulated by EMTP-ATP.The effects of initial closing voltage phase angle,closing dispersion of circuit breaker and ambient temperature on zero sequence magnetic flux of reactor core are analyzed.The simulation results show that when the iron core reac-tor is put into operation,it will produce zero sequence flux component with high ampli-tude,which will gather high magnetic density on rigid structural parts such as yoke and clamp,resulting in eddy current loss.