PT二次电压不平衡现象浅析  

Analysis of PT Secondary Voltage Unbalance Appearance

作　　者：李陆[1] 

机构地区：[1]济钢集团有限公司能源动力厂,山东济南250101

出　　处：《山东冶金》2010年第5期39-40,共2页Shandong Metallurgy

摘　　要：从中性点不接地电力系统中的绝缘监测功能单元及铁磁谐振角度出发,对安装消谐电阻器后引起的电磁式电压互感器星三角接线二次侧三相电压不平衡现象进行了分析和计算,由于三相PT的伏安特性不同,PT二次侧电压存在误差是正常的,安装三次谐波限制器可限制PT二次侧开口三角两端的三次谐波电压。From the point of view of insulation monitoring unit and ferromagnetic resonance in neutral point without earthing power system,this article analyzed and calculated the unbalance appearance at the secondary side three-phase of electromagnetic voltage transformer after installation of harmonics removing resistor.Because of different PT three-phase volt-ampere characteristics,the errors in PT secondary voltages exist is natural.The installation of third harmonic limiter can limit the third harmonic voltage.

关 键 词：电压互感器 铁磁谐振 零序电压 不平衡现象 

分 类 号：TM451[电气工程—电器]