Flexible graphite grounding material provides a new method to solve the corrosion problem of grounding grid

but its impulse grounding performance needs further analysis. Consequently

we employed a finite element method to solve the two-dimensional eddy current field

and comparatively analyzed the inductance and resistance of flexible graphite grounding material and steel grounding material under the action of high frequency current. Calculation results show that

due to high permeability

the equivalent resistance of steel increases significantly when frequency increasing

and exceeds that of flexible graphite grounding material with the same radius when the frequency reaches 35 kHz. In addition

when the frequency reaches 5 kHz

the self-inductance of steel quickly falls to the level of 10

-6

H/m

and then gradually decreases to the level of 10

-7

H/m

close to that of flexible graphite and copper. The method of orthogonal experiment design is used to determine the simulation parameter combination of the soil resistivity

the length of grounding material

and the amplitude of lightning current so as to compare and analyze the impulse grounding resistance. The calculation results show that the impulse grounding resistance of flexible graphite grounding material is smaller than that of the round steel. Finally

the simulation results are verified by actual impulse grounding tests.