Research Of Impulse Grounding Resistance Measurement Equipment Based On DSP

Along with the development of the electric power system, the trouble that lightning strikes the electric transmission line increases increasingly. According to electricity net failure classification, we can know that in higher rate of the circuit to trip region in our country, the breakdown number because of thunder striking has 40% of the total amount or so, while in the complicated geography condition place with many thunder, in which the soil electric resistance rate is higher, so the breakdown number can amount to 70%. Thus it will bring for huge economy loss. Reducing the value of tower impulse grounding resistance is a kind of the valid method that can raise the safe circulation of the electric transmission line, so that the accurate and dependable measurement to the tower impulse grounding resistance is the key for the safe circulation of the electric transmission line.Domestic and international measurement for the tower impulse grounding resistance mainly has three kinds of method. The first method is numerical calculation. The second method is the measuring at spot. The last method is that the numerical calculation is combined with the measuring at spot.Numerical calculation method: the numerical calculation method not only establishes mathematics physics model very difficulty, but also does not consider the different spot environment, such as different soil electric resistance rate and different geography condition. And the method has no university and the calculation result can't be got the verification.Measuring at spot method: although the measuring at spot method is accurate, the measuring equipments are very bulky and not suitable for the pole tower condition in open country, particularly in the complicated geography regions. Some times, to carry the bulky equipments to the spot is almost impossibly.This paper introduces the method that the number calculation method...