浅析电力系统铁磁谐振过电压

Discussion on Overvoltage of Electric Power System ferro-Resonance

电力系统中包含有很多电感和电容元件,在系统发生故障时,它会形成不同自振频率的振荡回路,在外加电源的作用下会产生谐振过电压,而电力系统中的电感元件大多因带有铁芯会产生饱和现象,使电感参数不再是常数,而是随着电流或磁通的变化而变化,这样就形成了电力系统铁磁谐振过电压。它会破坏电气设备的绝缘,甚至会烧毁电气设备,严重威胁着电力系统的安全、稳定运行。本文着重分析了电力系统铁磁谐振过电压的产生原理,介绍了电力系统中一些典型的铁磁谐振过电压及其危害,并提出具体的防范措施。

There are many inductance and capacitance component contained in power system,They can form oscillation loop of different auto-vibration frequency when system happen fault,they can produce resonance overvoltage under the condition of additional power source Most of inductance component in power system with iron core can produce saturable phenomenon,that make inductance paremeter aren＇t constant,it changes with current and magnetic flux and form ferroresonance overvoltage. It can damage insulation of electrical equipment,seriously threaten safe and stable operation of power system.This paper analyzes the theory of producting ferro-resonance overvoltage in power system,introduces some typical ferro-resonance overvohage and its endanger in system,Preventive measures are proposed.