电磁式电压互感器铁磁谐振的消谐措施

Harmonic Elimination Measures for Ferromagnetic Resonance of Electromagnetic Voltage Transformers

在国内电网中,使用的电压互感器主要有电磁式电压互感器(PT)、电容式电压互感器和少量使用的新型光电式电压互感器。PT在非有效接地系统中极易产生铁磁谐振,造成其高压熔丝熔断,甚至电压互感器烧毁,从而引起其他更严重的安全事故。针对此现象,对PT铁磁谐振的消谐措施进行探讨。

In China power grid,the mainly applied voltage transformers are electromagnetic voltage transformers(PT)and capacitive voltage transformers,and the use of the new type of optoelectronic voltage transformers is relatively uncommon.In the ineffective grounding system,the electromagnetic voltage transformer is prone to produce ferromagnetic resonance,resulting in the fusing of its high-voltage fuse,or even the burning of the voltage transformer,and in consequence,other more serious safety accidents.In consideration of this issue,the present paper discusses the harmonic elimination measures for ferromagnetic resonance of electromagnetic voltage transformers.