摘要
太阳磁暴和直流输电在大地中形成的准直流电流和直流电流,会影响变压器铁心的磁化特性和电网的正常运行。利用单相三柱变压器进行不同直流偏磁条件下的直流偏磁实验。实验结果表明直流偏磁会影响变压器铁心的磁滞特性与励磁特性,直流磁通的大小与直流电流、交流电压相关。分析变压器铁心直流偏磁下的磁化特性,对于电力系统的安全运行、变压器的设计与制造有着重要的工程意义。
Magnetizing characteristics of power transformer and normal operation of power grids are affected by the quasi-direct current and the direct current caused from the solar magnetic disturbance and the HVDC system respectively. In order to study DC-biasing characteristics of power transformer,a single-phase three-limb transformer is applied to carry out the DC biasing experiment in this paper. The measured magnetizing current are analyzed to study the influence of DC bias on harmonic components of magnetizing current. The iron loss are measured and analyzed under DC-biased magnetization. The measured results indicate the DC bias current has a great influence onhysteresis and excitation characteristics. The DC magnetic flux is related to the DC bias current and the excitation voltage by combining experimental results and theoretical deduction. Analysis of DC-biasing magnetizing characteristics is of great engineering significance on the safe operation of the power system,the design and manufacture of the power transformer.
出处
《电工电能新技术》
CSCD
北大核心
2014年第6期69-74,共6页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金(51307057)
北京市自然科学基金(3133038)
河北省自然科学基金(E2013502323)
高等学校博士学科点专项科研基金(20130036120011)资助项目
关键词
电力变压器
直流偏磁
直流磁通
磁化特性
power transformer
DC bias
DC magnetic flux
magnetizing characteristics
