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A diagnostic method for low voltage switching arcs is proposed where the magnetic field of the switching current is used to determine the arc movement. The magnetic field of the switching current density is recorded with an array of field sensors. The time and space resolved readings are compared with results from simulations of the arc. Parameters of the simulation and therefore current densities are adapted to reconstruct the measurement readings. So an inversion of the ill conditioned integral equation is not necessary. Results with a hardly optimized set up showed that this approach may be successfully applied to measure arc movements.
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