0.18 mm极低损耗取向硅钢电磁特性与铁心性能仿真分析

Analysis of performance simulation of iron core and electromagnetic characteristics of 0.18 mm grain-oriented silicon steel with ultra-low loss

基于极低损耗取向硅钢研制S15型超高能效变压器对于进一步推动电网节能增效具有重要意义.采用任意波形磁场激励测量系统对比研究了0.18 mm规格取向硅钢、1K101-S普通型、1K102-P高磁感型非晶合金的磁性能及磁致伸缩噪声特性,并分析了0.18 mm取向硅钢在谐波、直流偏磁等复杂工况下的损耗特性,采用MagNet有限元分析软件开展了0.18 mm极低损耗硅钢S15型变压器铁心、绕组建模与仿真分析.结果表明,磁通密度为1.35 T时,18QH065牌号取向硅钢的铁损低至0.349 W/kg,不断接近非晶合金水平,磁感B800则比非晶带材高0.32~0.40 T;取向硅钢的磁致伸缩系数λp-p为0.29×10-6,低于非晶合金超1个数量级.与0.23~0.30 mm常规厚度硅钢相比,0.18 mm薄规格硅钢的谐波损耗优势明显,10%含量的3次、5次谐波损耗与正常工况相比分别上升12.9%、16.0%;直流偏置磁场大小对取向硅钢铁损的影响主要在低磁密区,在1.9 T以上0~150 A/m偏置磁场下的铁损几乎相同.设计的10 kV/630 kVA变压器空载损耗仿真计算值为392.5 W,比国标GB 20052—2013中能效1级硅钢变压器的限定值低约31.1%,噪声比同等容量非晶合金变压器低约10 dB,具有显著的节能和环保优势.

The development of S15 type ultra-high energy efficiency transformer based on low loss grain-oriented(GO)silicon steel is of great significance for further promoting energy saving and efficiency enhancing of power grid.The magnetic properties and magnetostrictive characteristics of 0.18 mm GO steel,1K101-S and 1K102-P amorphous alloy were studied using measurement system under arbitrary waveform of magnetic induction.The core losses of 0.18 mm GO steel under harmonic and DC-bias were analyzed,and the modeling and simulation analysis of iron core as well as winding of S15 type transformer were carried out by using the MagNet finite element software.When the magnetic flux density is 1.35 T,the core loss of 18QH065 GO steel is as low as 0.349 W/kg,which is approach to the level of amorphous alloy.The magnetic induction B 800 of GO steel is 0.32-0.40 T higher than that of amorphous alloy strip.The magnetostrictive coefficient of GO silicon steel is 0.29×10-6,which is lower than that of amorphous alloy by one order of magnitude.Besides,the harmonic loss of 0.18 mm silicon steel is significantly lower than that of 0.23-0.30 mm silicon steels,and the third and fifth harmonic losses under content of 10%increased by 12.9%and 16.0%respectively.DC bias(0-150 A/m)has an obvious effect on the core loss of 0.18 mm GO steel under low magnetic flux density(MFD),while the loss is almost the same after MFD higher than 1.9 T.Finally,the no-load loss of designed 10 kV/630 kVA transformer is 392.5 W(31.1%lower than that of transformer with first-grade energy efficiency in standard of GB 20052-2013),and the noise is about 10 dB lower than that of amorphous alloy transformer with the same capacity,which means significant advantages of energy conservation and environmental protection.