After the single-phase grounding fault occurs in the substation

the ferromagnetic resonance of the voltagetransformer（TV）is easily triggered

which causes the frequent fusing of the TV fuse and influences the safe operationof the power system. For researching the essential laws and influence factors of ferromagnetic resonance in substa-tion

based on the EMTP-ATP electromagnetic transient simulation software and considering the nonlinear character-istics of TV core

a distributed parameter model of ferromagnetic resonance calculation in a 35 kV substation is es-tablished. The cause of ferromagnetic resonance in substation is analyzed

and the restraining measures are put for-ward. The research shows that the single phase ground disappearance time determines whether TV will excite ferro-magnetic resonance. If the voltage of the non fault phase is instantaneous maximum

the most severe ferromagneticresonance of TV will occur. The arc suppression coil and the harmonic eliminator should be preferred in the substa-tion harmonic elimination measures

and the second is to put the damping resistor in the open triangular winding. Af-ter the arc suppression coil is put into operation

the TV three-phase current is reduced to far less than its rated cur-rent at the time of earth disappearance

which fundamentally avoids the fusing of TV fuse. 35 kV side adding arc sup-pression coil as no effect on suppressing 10 kV ferromagnetic resonance. When installing the harmonic eliminator

the TV three phase current should not exceed its rated value to avoid fuse while ensuring the suppression of ferromag-netic resonance. The smaller the input resistance value of TV open delta winding is

the better the inhibition effectfor ferromagnetic resonance. But the larger the three-phase current of TV is

the easier it will burn the fuse. The timeof the earth’s disappearance should be accurately judged

and the damping resistor can be switched accurately.