Research and Application of the System on Measuring Magnetic Field in Complicated EMI Environment in Substation

In order to test the corrosion degree and broken points of grounding grids, being aimed at the distribution characteristics of the surface magnetic fields, a special system of measuring the surface megnetic imduction imtensities is designed based on analyzing the practical EMI environment in substation. Using by this system, the surface magnetic field distrbutions is measured by Faraday electromagnetic induction theorem. Experimental and practical researchs show that this diagnosis method is feasible, the system is pratical and reliable. The dignosis efficiency and precision are improved.