基于ZnO非线性电阻的新型消弧消谐策略研究  

Study on arc and resonance elimination strategy based on ZnO varistor

作　　者：杨振宇[1] 钱敏慧[1] 陈宏钟 胡永军 赵剑锋[1] 

机构地区：[1]东南大学电气工程系,江苏南京210096 [2]徐州市电力公司,江苏徐州221003

出　　处：《电力自动化设备》2006年第9期16-19,共4页Electric Power Automation Equipment

摘　　要：首先,阐述了配网中性点不接地系统产生弧光接地过电压和铁磁谐振过电压的机理,针对2种过电压的产生机理,提出采用氧化锌非线性电阻限压器投于系统故障相。对于弧光接地过电压,限制其弧道恢复电压;对于铁磁谐振过电压,利用限压器吸收电压互感器的铁磁谐振能量,使其退出饱和,最终达到消除2种过电压的目的。在PSCAD/EMTDC中建立了间歇性弧光接地和限压器的简化仿真模型,仿真结果证明了新策略消除弧光过电压和谐振过电压的有效性。Mechanisms of arc grounding over- voltage and ferroresonance over-voltage in insulated neutral systems are expatiated. Based on it,nonlinear ZnO varistor is applied in the system and connected with the fault- phase to suppress two kinds of over- voltage ：for the arc grounding over -voltage,the ZnO varistor limits arc reverting-voltage;for the ferroresonance over-voltage,the ZnO varistor absorbs ferroresonance energy of voltage transformer and makes it deviate from saturated state. Models of intermittent arc grounding and voltage limiter are established in PSCAD/EMTDC, and simulation results testify the effectiveness of over-voltage suooression with proposed methods.

关 键 词：中性点不接地 弧光接地过电压 铁磁谐振过电压 限压器 

分 类 号：TM711[电气工程—电力系统及自动化]