In this paper, we propose a method for detecting cracks non-destructively by measuring the magnetic field around a distribution line. We report experimental and calculated results for the magnetic flux density around the distribution line, and consider the characteristics of the magnetic field distribution around the line. We present an algorithm with the parameter ΔLm for detecting the cracks, and consider the characteristics of the parameter Δ/Lm with respect to the current, the diameter of the leading wire, the radius of the circle of sensors, the number of sensors, and the depth of the crack.
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