地磁感应电流在三相电力变压器绕组中的流通路径分析  

Analysis of GIC flow path in windings of three-phase power transformer

作　　者：郑涛[1] 高小芊 杨国生[2] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]中国电力科学研究院,北京100085

出　　处：《电力自动化设备》2017年第2期104-112,共9页Electric Power Automation Equipment

摘　　要：通过构建计及地磁感应电流(GIC)影响的交流系统仿真模型,研究了在不同运行条件下,GIC在Yg-Y接线与Yg-△接线变压器中GIC流通路径的特征。研究结果表明,在变压器三相绕组不对称饱和情况下,GIC在变压器三相绕组中非均匀分布,同时由于GIC的低频变化特征,GIC可能传变至变压器Y(△)侧,对继电保护系统的可靠运行产生影响。A simulation model of AC system with GIC（Geomagnetically Induced Current） is built and the GIC flow paths in the windings of three-phase transformer under different operating conditions are studied for Yg-Y and Yg-△ connection modes respectively. Results show that,GIC is not evenly distributed in three phase windings during the asymmetrical saturation,and due to the low-frequency variation,GIC may flow to the Y-side in Yg-Y connection mode or the △-side in Yg-△ connection mode,influencing the reliable operation of protection system.

关 键 词：电力变压器 直流偏磁 地磁感应电流 流通路径 

分 类 号：TM41[电气工程—电器]