摘要
取向硅钢制成变压器铁芯后直接关系电网的安全性和节能性。对配电变压器铁芯用二次硅钢片的性能进行了全面评估,结果表明,抽取自A地区、B地区及C地区的二次硅钢片的铁损最高可达1.91 W/kg(变压器空载损耗高),磁致伸缩系数λ_(1.7T)高至3.9×10^(-6)(变压器噪音大),表面绝缘电阻最低仅有1~2Ω·cm^2/片(片间绝缘能力降低后直接威胁铁芯安全),涂层附着性为D级甚至更差,产品质量存在严重缺陷。长期使用二次硅钢片会给挂网运行的配电变压器带来严重的质量问题和安全隐患。通过全面检验硅钢片的表面质量、磁性能、涂层性能、组织结构可鉴别出变压器铁芯材质是否为二次硅钢片。
The grain-oriented silicon steel, once being processed into transformer core, has a direct impact on power network＇ s energy use and safety, This paper provides a thorough evaluation of the properties of used silicon steel. Our results show that serious product quality issues exist with used silicon steel sheet. For sample sheets from three regions of A, B and C, the highest core loss （P1.7） was 1.91W/kg （high no load losses）, the highest magnetostrictive coefficient （λ1.7T） was 3.9×10^-6 （high noise）, the lowest surface insulation resistance was only 1～2Ω·cm^2 per sheet （low insulation between sheets is a direct threat on the safety of the steel core）, and the coating adhesive property was at D level or worse. The sustained use of used sihcon steel in grid connected transformers presents a serious quality and safety concern. Whether or not the transformer core was made from used silicon steel can be determined through a comprehensive inspection of the surface quality, magnetic performance, coating property and microstructure of the silicon steel sheet.
出处
《中国电力》
CSCD
北大核心
2016年第2期73-77,共5页
Electric Power
基金
国家电网公司科技资助项目(SGRI-WD-71-14-002)
关键词
配电变压器
取向硅钢
性能评估
鉴定
distribution transformer
grain-oriented silicon steel
performance evaluation
inspection
