摘要
为验证0.06 mm超薄聚乙烯醇缩甲醛漆膜换位导线的质量及变压器绕组机械电气性能稳定性,解决传统抽检难以全面评估其工程风险的问题,设计两组试验绕组(采用相同批次导线,W1导线无环氧树脂胶层,W2导线含侧涂环氧树脂胶层),采用尺寸检测、500 V直流股间短路测试、分级压制测试及煤油气相干燥处理,模拟导线在制造流程(绕制、干燥、打压)及短路运行状态下的性能。结果表明:该导线尺寸偏差均控制在GB/T 7673.2—2018规定的厚度±0.03 mm、宽度±0.07 mm范围内,漆膜厚度实测值0.056~0.063 mm,击穿电压2.5~5.1 kV(远超标准要求:不小于2 kV),直阻率0.017 017Ω・mm^(2)/m(低于限值:不大于0.017 391Ω・mm^(2)/m);W1绕组在37 MPa压力下出现轴向倾斜,W2绕组在50 MPa(设备极限)下无倾斜及股间短路,抗倾斜能力较W1提升35.1%。与传统0.1 mm漆膜导线相比,该超薄漆膜导线可使变压器绕组填充率提升1%~2%,且含胶层结构能显著增强绕组机械稳定性,为其规模化工程应用提供数据支撑。
To verify the quality of 0.06 mm ultra-thin polyvinyl formal enameled continuous transposed conductors and the mechanical and electrical performance stability of transformer windings,and solve the problem that traditional sampling inspection cannot fully evaluate their engineering risks,two groups of test windings are designed using conductors from the same batch:W1 without epoxy resin layer,W2 with sidecoated epoxy resin layer.Performance during manufacturing processes(winding,drying,pressing)and short-circuit operation are evaluated through dimension inspection,500 V DC inter-strand short-circuit test,graded pressing test,and kerosene vapor drying treatment.The results show that the dimensional deviation of the conductor is controlled within the range of±0.03 mm(thickness)and±0.07 mm(width)specified in GB/T 7673.2—2018,the actual enamel thickness is 0.056~0.063 mm,the breakdown voltage reaches 2.5~5.1 kV(far exceeding the standard requirement of not less than 2 kV),and the DC resistance is 0.017017Ω·mm^(2)/m(lower than the limit of not larger than 0.017391Ω·mm^(2)/m).W1 winding shows axial tilting at 37 MPa,while W2 winding has no tilting or inter-strand short circuit at 50 MPa(equipment limit),and its anti-tilting capacity is 35.1%higher than that of W1.Compared with traditional 0.1 mm enameled conductors,the ultra-thin enameled conductor can increase the filling rate of transformer winding by 1%~2%,and the structure with adhesive layer can significantly enhance the mechanical stability of winding,providing data support for its large-scale engineering application.
作者
蔡孟
李林达
Cai Meng;Li Linda(Siemens Energy Transformer(Guangzhou)Co.,Ltd.,Guangzhou 510530,China)
出处
《机电工程技术》
2025年第23期182-185,222,共5页
Mechanical & Electrical Engineering Technology
关键词
超薄漆膜
换位导线
变压器绕组
质量评估
打压测试
ultra-thin enamel
continuous transposed conductor
transformer winding
quality evaluation
pressure test
