特高压变压器用硅钢片应用磁性能的评估  

Assessment on Applied Magnetic Properties of Silicon Steel Sheet in UHV Transformer

作　　者：张书琦[1] 李鹏[1] 徐征宇[1] 汤浩[1] 李金忠[1] 仇宇舟[1] 刘雪丽[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2017年第18期5511-5518,共8页Proceedings of the CSEE

摘　　要：IEC 60404仅指定了单片硅钢片的磁性能测试方法,难以满足特高压变压器用硅钢片应用磁性能的评估需求。为此,建立了基于铁心模型的硅钢片应用磁性能试验系统,对比研究了2种硅钢片牌号铁心模型的深度磁饱和特性、耐受直流偏磁特性及反复过励磁特性。研究结果表明:试样II铁心模型空载电流在100%~115%额定电压范围内明显大于试样I铁心模型,电流谐波含量及声级也有相同规律;相同直流偏磁电流下,试样Ⅱ铁心模型的空载损耗小于试样I铁心模型,直流偏磁电流大于1.0A后该趋势更加明显;反复过励磁条件下试样Ⅱ铁心模型空载电流及空载损耗波动范围较大,反复过励磁前后空载损耗变化率较小。最后,提出了适用于特高压变压器用硅钢片应用磁性能的8项评估指标,分析结果认为,试样Ⅰ及试样Ⅱ铁心模型在应用磁性能方面差别明显。研究结论为技术人员掌握硅钢片应用磁性能提供了新思路。IEC 60404 just specified the test methods on magnetic properties of single silicon steel sheet, and it was difficult to meet the requirements of the applied magnetic properties of silicon steel sheet for UHV Transformer. Therefore, applied magnetic properties test system for silicon steel sheet based on iron core model was established, and the characteristics included deep magnetic saturation, DC bias tolerance and repetitive excitation were studied by comparing two kinds of silicon steel sheet iron model. The results show that, the no-load current of Sample II iron core model is significantly greater than Sample I during the range of 100%-115% rated voltage, and harmonic current content together with sound level have same regularities. Moreover, the no-load loss of Sample II iron core model is less than the Sample I under same DC bias current especially when higher than 1.0A. In addition, the no-load current and loss of Sample II iron core model have larger fluctuation ranges during repetitive excitation, but smaller no-load loss change rate before and after the repetitive excitation. In the end, eight assessment index on magnetic properties of silicon steel sheet in UHV transformer were proposed, and results show that applied magnetic properties between Sample I and II iron core has obvious differences. The conclusions provide a new idea for the technical personnel to know the application of magnetic properties of silicon steel sheets well.

关 键 词：特高压变压器 硅钢片 应用磁性能 深度磁饱和耐受直流偏磁 反复过励磁 评估 

分 类 号：TM85[电气工程—高电压与绝缘技术]