什么是铁磁谐振呢？它是怎么产生的呢？

What is a ferromagnetic resonance? How is it come? 

铁磁谐振是由铁心电感元件，如发电机、变压器、电压互感器、电抗器、消弧线圈等系统的电容元件，如输电线路、电容补偿器等形成共谐条件，激发持续的铁磁谐振，使系统产生谐振过电压。

Ferromagnetic resonance is a core inductance components, such as generator, transformer, voltage transformer, reactor, the capacitance element of arc suppression coil and so on system, such as transmission lines, such as capacitor compensator form total harmonic condition, stimulate continuous ferromagnetic resonance, make the system produce resonance overvoltage. 

电力系统的铁磁谐振可分二大类：一类是在66kV及以下中性点绝缘的电网中,由于对地容抗与电磁式电压互感器励磁感抗的不利组合,在系统电压大扰动（如遭雷击、单相接地故障消失过程以及开关操作等）作用下而激发产生的铁磁谐振现象；另一类是发生在220kV（或110kV）变电站空载母线上，当用220kV、110kV带断口均压电容的主开关或母联开关对带电磁式电压互感器的空母线充电过程中，或切除（含保护整组传动联跳）带有电磁式电压互感器的空母线时，操作暂态过程使连接在空母线上的电磁式电压互感器组中的一相、两相或三相激发产生的铁磁谐振现象，即串联谐振，简单地讲就是由高压断路器电容与母线电压互感器的电感耦合产生谐振由于谐振波仅局限于变电站空载母线范围内，也称其为变电站空母线谐振

Power system of the ferromagnetic resonance can be divided into two categories: one is in the power grid of 66 kv and below the neutral point insulation, because of capacitive reactance and electromagnetic voltage transformer excitation inductance unfavorable combination, the system voltage large disturbances (such as a lightning strike, single-phase earth fault disappear process and switch operation, etc.) under the action of the excitation produced by ferromagnetic resonance phenomenon; Another kind is occurred in 220 kv substation of 110 kv) in the (or light load on the bus, when the use of 220 kv, 110 kv with fracture of equalizing capacitor main switch or bus coupler switch with electromagnetic voltage transformer empty bus charging process, or resection (including protect the whole transmission united jumping) with electromagnetic voltage transformer empty bus, transient process make the connection on the empty bus operation of electromagnetic voltage transformer in the group phase, two phase or three phase excitation produced by ferromagnetic resonance phenomenon, namely the series resonance, simply put is composed of high voltage circuit breaker capacitance and inductance coupling connection of busbar voltage transformer resonance due to the resonance wave limited to no-load busbar substation scope, also referred to as substation busbar resonance