基于双重保护拓扑的变压器直流偏磁抑制措施  

Measures of transformer DC bias suppression based on dual protection topology

作　　者：李长云[1,2] 李庆民[2] 李贞[2] 姚金霞[3] 刘民[3] 

机构地区：[1]山东轻工业学院电气工程与自动化学院,山东济南250353 [2]山东大学电气工程学院,山东济南250061 [3]山东电力研究院,山东济南250002

出　　处：《电力自动化设备》2012年第1期71-75,共5页Electric Power Automation Equipment

基　　金：山东省杰出青年基金资助项目(JQ200916)~~

摘　　要：超/特高压直流输电系统调试或故障时的单极-大地运行方式,均可导致直流偏磁现象,半岛地质环境下此效应尤为突出。结合山东半岛电网的具体线路架构和数据,对基于变压器中性点串电容的直流偏磁抑制方案进行了优化分析,提出采用并联避雷器和火花间隙的双重保护拓扑,并给出了直流偏磁抑制装置中的中性点电容器、旁路开关、电子开关、限流电抗器等的选择,以及避雷器与火花间隙的选择与配合。仿真结果表明,在系统发生故障时,所提出的双重保护拓扑可有效保护中性点直流偏磁抑制装置的安全。The single-pole-to-ground operation mode of UHV/HV DC transmission system during system commissioning or fault causes DC bias phenomenon in AC power grid,which will be strengthened under the condition of peninsular geology. According to the specific grid structure and parameters of Shandong peninsula,the DC bias suppression scheme based on the serial neutral-point capacitor of transformer is analyzed and the dual protection topology of paralleled lightning arrester and spark gap is proposed for optimization. The selection of relevant devices,such as neutral-point capacitor,bypass switch,electronic switch,current-limiting reactor,etc.,and the cooperation between lightning arrester and spark gap are given. The simulative results indicate that,the proposed dual protection topology can effectively protect the DC bias suppression equipment during system fault.

关 键 词：半岛地质 直流偏磁 变压器 中性点电容器 保护 拓扑 高压直流输电 

分 类 号：TM452[电气工程—电器]