基于有限元法的单相变压器直流偏磁仿真研究  

Simulation of DC Bias of Single-phase Transformer Based on FEM

作　　者：肖华[1] 吴广宁[1] 蒋伟[1] 任志超[1] 官澜[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《高压电器》2010年第9期39-42,47,共5页High Voltage Apparatus

摘　　要：中国±500 kV直流输电系统的运行经验表明:直流输电单极大地回路方式运行时,直流接地极电流会导致附近交流变压器直流偏磁现象,引起变压器局部过热、振动加剧、噪音增大。笔者运用ansoft软件分析了在不同直流偏磁情况下,变压器空载状态下的铁心磁场分布情况。结果表明,随着变压器直流电流的增加,变压器铁心饱和度愈高,磁感应强度增加,上下铁轭衔接处随着直流量的增加磁感应强度增加速率最大。The operation experience of ±500 kV DC transmission system in China shows that the operation of a HVDC transmission system under ground-return mode,partial entering ground current may flow into the AC transformers of which neutral point grounded and cause DC bias,which leads to the local overheating of AC transformer,increasing its vibration and noise.This paper analyzes magnetic field distribution of transformer core under non-load state in different circumstances of DC bias by using the software ansoft.The results show that with the increasing of DC,the saturation of core increased and so did magnetic induction;the fastest increase point is at the magnetic induction of upper and lower iron yoke.

关 键 词：单相变压器 有限元 直流偏磁 场路耦合 

分 类 号：TM411.1[电气工程—电器]