铁心电抗器气隙边缘效应计算及影响因素

Calculation and influence factors of air-gap edge effect of iron-core reactor

提出一种用于计算气隙等效导磁面积的方法:用有限元法计算自感,将漏感从仿真所得自感中扣除,再结合主电感理论公式反推出气隙等效导磁面积扩大系数。分析了电感参数及ANSYS计算原理;结合对比文献论证了本方法的优越性;实验和仿真验证了该方法的正确性;定性分析气隙边缘效应的影响因素。研究结果表明:主要影响因素依次为气隙长度、铁心截面积、铁心相对磁导率,且气隙长度起主导作用;气隙等效导磁面积扩大系数与气隙长度呈正比,与铁心截面积和相对磁导率呈反比。本方法有效避免了漏电感的影响,所得结论可为铁心电抗器的设计提供参考依据。

A method is proposed for calculating air-gap equivalent cross-sectional area.The finite element method was used to calculate the self-inductance,and the leakage-inductance was deducted from the self-inductance simulated.With the main-inductance′formula,it deduced the air-gap equivalent cross-sectional area coefficient′s expression.Different kinds of inductances and ANSYS calculation theory were analysed.This method′s superiority was demonstrated by comparing with the reference.Experiments and simulations confirm the correctness.Qualitative analysis of influence factors of air-gap edge effect was made.Research results showed that main influence factors include air-gap,iron′s cross-sectional area and iron′s relative permeability.The air-gap plays a leader role.The relationship between air-gap equivalent cross-sectional area coefficient and air-gap is a proportional function,while the relationship is an inverse proportional function with iron′s cross-sectional area or iron′s relative permeability.This method can avoid the leakage-inductance′s influence and the results provide some references for designing iron-core reactor.