铁心电抗器气隙边缘效应计算及影响因素

摘要

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-sec-tional area coefficient′s expression.Different kinds of inductances and ANSYS calculation theory were an-alysed.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 equiva-lent cross-sectional area coefficient and air-gap is a proportional function,while the relationship is an in-verse 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.