厂用6kV系统铁磁谐振分析及措施研究

在3～10kV用电系统中,由于电气设备基本参数配置不当,常导致谐振过电压现象,给电厂的发电机等设备安全运行带来较大隐患。本文以元宝山发电厂6kV厂用电系统铁磁谐振为例,系统分析了铁磁谐振产生的原因及危害,提出采用PT的3＋1消谐措施改善PT伏安特性的方法,通过计算确定容抗阻抗比,较好的解决了铁磁谐振的问题,经实践检验证明该方法简便、有效,具有较好的推广价值。

Ferroresonance analysis and methods in 6kV station service electrical system

Resonance overvoltage happened mostly when the parameters of electrical installations were improper in 3～10kV station service electrical system,which caused more hidden defects for most machines in power station.Took ferroresonance in 6kV station service electrical system of Yuanbaoshan power station for instance,the reason for ferroresonance was analyzed,the method of resonance suppression and improving volt-ampere characteristic of PT was accepted,the ratio of capacitive reactance and impedance was calculated and ferroresonance was eliminated easily.This method was proved to be easy and feasible,had better applicable value.