直流偏磁对特高压交流变压器漏电感影响的分析  

Influence of DC Bias on Leakage Inductance of UHV Transformer

作　　者：梁书原 王泽忠[1] 李宇妍 LIANG Shuyuan;WANG Zezhong;LI Yuyan(Beijing Key Laboratory of High Voltage&EMC,North China Electric Power University,Beijing 102206)

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206

出　　处：《变压器》2024年第10期26-34,共9页Transformer

基　　金：国家自然科学基金项目(51677068);国家重点研发计划专项资助项目(2016YFC0800100)。

摘　　要：本文作者基于棱边有限元法建立了特高压变压器的时域场路耦合模型,通过对电路模型解耦,建立了自耦变压器的T型等效电路,求得其等效电感参数;通过对磁化曲线的修正,提高了电流的计算精度,得到更精确的直流偏磁下特高压变压器的求解结果。利用单相四柱式自耦变压器试验平台,验证了磁化曲线修正方法的可靠性。结合励磁电流、绕组电流曲线以及磁密曲线,对特高压变压器铁心饱和程度变化的原因进行分析,解释了一个周期内漏电感参数的变化规律;通过不同直流下电流曲线以及漏电感参数曲线的对比,研究了直流偏磁对漏电感参数的影响范围。Based on the edge finite element method,the time-domain field circuit coupling model of UHV Transformer is established.By decoupling the circuit model,the T type equivalent circuit of autotransformer is established,and its equivalent inductance parameters are obtained.Through the correction of magnetization curve,the calculation accuracy of current is improved,and a more accurate solution result of UHV Transformer under DC bias is obtained.The reliability of the magnetization curve correction method is verified by using the single-phase four column autotransformer test platform.Combined with the excitation current,winding current curve and magnetic density curve,the reason for the change of saturation degree of UHV Transformer core is analyzed,and the change law of leakage inductance parameters in one cycle is explained;By comparing the current curves and leakage inductance parameter curves under different DC,the influence range of DC bias on leakage inductance parameters is studied.

关 键 词：特高压变压器 直流偏磁 场路耦合 漏电感 磁化曲线 

分 类 号：TM401.1[电气工程—电器]