基于产品级模型复杂工况下取向硅钢励磁特性研究

Research on excitation characteristics of oriented silicon steel under complexworking conditions based on product level models

从工程实用性和有效性的角度出发,设计制造产品级铁心模型。基于物理模型研究谐波相位差对空载损耗的影响,相位差为π时,铁心性能最差。有限元仿真得到谐波、直流偏磁复杂工况下铁心磁密分布情况,分析了空载损耗增大原因。开展复杂工况下0.20~0.27 mm规格取向硅钢铁心模型对比试验,结果表明:工作磁密1.7 T叠加10%含量三次谐波,20SQGD070铁心模型的附加损耗较27SQGD090铁心模型的附加损耗减少31%;不同厚度规格取向硅钢铁心模型在直流偏磁下的附加损耗相当。考虑取向硅钢材料在变压器中的服役工况,提出复杂工况下取向硅钢选材建议。

From the perspective of engineering practicality and effectiveness,product level iron core models were designed and manufactured.Based on a physical model,the influence of harmonic phase difference on no-load loss was studied.When the phase difference isπ,the performance of the iron core is the worst.The finite element simulation obtained the magnetic density distribution of the iron core under complex working conditions of harmonic and DC bias,and analyzed the reasons for the increase in no-load loss.Comparative experiments were conducted on the 0.20-0.27 mm oriented silicon steel iron core model under complex working conditions.The results showed that the additional loss of the 20SQGD070 iron core model was reduced by 31%compared to the 27SQGD090 iron core model when the working magnetic density was 1.7 T and 10%third harmonic was added.The additional losses of silicon steel core models with different thickness specifications under DC bias are comparable.Considering the service conditions of oriented silicon steel materials in transformers,suggestions for selecting oriented silicon steel materials under complex working conditions are proposed.