变压器空载合闸励磁涌流抑制技术研究  

Study on Inrush Current Restraining Technology when Energizing No-load Transformer

作　　者：郝治国[1] 张保会[1] 褚云龙[1] 顾丕骥 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]宝鸡市宝光真空开关有限公司,陕西宝鸡721004

出　　处：《高压电器》2005年第2期81-84,共4页High Voltage Apparatus

基　　金：国家自然科学基金(50277027)

摘　　要：在分析变压器空载合闸励磁涌流暂态过程及现有抑制励磁涌流措施原理的基础上,提出了一种改进的选相位关合技术来抑制三相YN,d接法变压器励磁涌流的新方法。该方法考虑了剩磁对励磁涌流的影响,利用中性点串联电阻的方法抑制首合相励磁涌流暂态过程,利用“延迟合闸”策略限制剩余两相涌流幅值。通过EMTP仿真表明该方法在铁芯剩磁难以准确测量的情况下可以有效地抑制变压器励磁涌流幅值及暂态过程。In this paper, an improved closing strategy is proposed and applied in restraining inrush currents when energizing no-load Y0/Δ power transformer. It uses a combination of series resistor insertion and controlled closing technology. Considering the effects of residual flux to inrush transient, the grounding resistor connected to the transformer neutral point is used to restrain the inrush transient of the first closeing phase and then a 'delayed closing-strategy' is employed to reduce the inrush current magnitude of the last two phases. The simulation by EMTP indicates that the strategy would restrain the inrush transient efficiently when the residual flux can't be measured.

关 键 词：变压器 励磁涌流 剩磁 选相位关合 电磁暂态程序(EMTP) 

分 类 号：TM41[电气工程—电器]