Analysis On Ferromagnetic Resonance Of 220kv System In MENG DA Power Plant

While power transmmission network tends to be more complicated ,It's operation becomes more frequent, Voltage level is raised also.As a result, ferromagnetic resonance in neutral point earthing system accure increasinly causing serious damages to its system. The study of ferromagnetic resonance caused by the grading capacitor is a work of important application Values.The problem of the ferromagnetic resonance is effcted by many reason,It is hard to find optimal ways.The author applies a new method of suppressing the ferromagnetic resonance by connecting a resistor between the neutral point of the PT and ground, The work of the author is shown as follows. 1) with examples of MENG DA company analyses the phenomenon of ferromagnetic resonance caused by the grading capacitor, based on model experiment and numerial computation, the paper analyses the effect of the grading capcitor busbar's stray capacitance dynamic hysteresis characteristics of ferromagnetic elements on ferromagnetic resonance. 2) The methods to limit ferromagnetic resonance are discussed and compared .3) The new effective is presented and tested, The detailed study shows that this method is quite effective.