中性点非直接接地系统铁磁谐振的产生及措施

Ferromagnetic Resonance Over-voltage in Neutral-point Indirect Earthing System

电力系统中有很多电感元件,当系统发生故障或开关操作时,在外加电源的作用下,这些电感可能与电容(如导线电容)产生铁磁谐振过电压。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。分析了电力系统铁磁谐振过电压的产生原理,产生原因,并提出了具体的防范措施。

With many inductance components contained in power system resonance over-voltage can be produced with eapaeitance components under the condition of additional power. It can damage the insulation of electrical equipment, seriously threaten the safe and stable operation of power system. This paper analyzes the theory of producing ferro- resonance over-voltage in power system, introduces some reasons for ferro-resonance over-voltage and its endanger in -system. Preventive measures are proposed meanwhile in the end.