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.
出处
《山东冶金》
CAS
2010年第5期39-40,共2页
Shandong Metallurgy
关键词
电压互感器
铁磁谐振
零序电压
不平衡现象
voltage transformer
ferroresonance
zero sequence voltage
unbalance appearance
