摘要
随着特高压电网建设的快速发展,直流偏磁对变压器的影响日渐突出,严重威胁电网安全。根据1 000 MVA/1 000 k V特高压变压器的实际参数尺寸建立场路耦合分析模型,利用有限元分析软件对不同直流偏磁电流下特高压变压器谐波、无功功率、局部过热等物理效应进行了分析。分析结果表明,随着流入变压器直流偏磁电流的增加,2~4次谐波幅值增长较快;无功功率显著增加,并与直流偏磁电流增加呈线性关系;各结构件中磁密升高,损耗增大,温升升高,当超过一定限值时,变压器将产生局部过热。
With the rapid development of UHV power grid construction,the influence of DC bias on transformers had become more and more prominent,which seriously threatened the safety of power grid.In this paper,the field coupling model was established according to the actual parameter size of 1 000 MVA/1 000 kV UHV transformer.And the physical effects of harmonic, reactive power and local overheating of UHV transformer under different DC bias current were analyzed by the finite element software.The results show that with the increase of DC bias current, the amplitude of 2-4 harmonics increases rapidly, and the reactive power increases significantly and linearly with the increase of DC bias current.The structure of the magnetic flux density increased ,the loss increases, the temperature rise increases, when more than a certain limit,the transformer would be local overheating.
作者
胥建文
李书连
杜建平
周训通
XU Jianwen; LI Shulian; DU Jianping; ZHOU Xuntong(Shandong Power Equipment Co., Ltd., Jinan 250022, China)
出处
《山东电力技术》
2018年第7期29-34,共6页
Shandong Electric Power
基金
国家电网公司科技项目(SGSDSB00ZGJS1602189)
