4th International Conference on Electric Power Equipment– Switching Technology (ICEPE-2017)

492 / 2017-05-10 17:13:08

Current Density Reconstruction in Low-voltage Circuit Breakers for the Stationary Configuration Based on Magnetic Inverse Problem Solution

13950,2032,13951,977,13952

This paper explores the magnetic inverse problem of reconstructing the current density distribution in low-voltage circuit breakers by inverting its magnetic field. The focus is on the modeling and solution phase for the stationary configuration where the effect of magnetization in splitters is considered. Regarding the failure of the plain reconstruction approach, a new reconstruction procedure is proposed in this paper by taking the magnetization as a mapping from the source domain. We have followed the standard method of least squares approximation by Tikhonov regularization complemented by generalized cross-validation criterion for regularization parameter selection. Finally, the influence of several features on the inverse solution, such as the signal-to-noise ratio, measurement distance, and the permeability of splitters, have been investigated. The numerical results show that good spatial resolution of current density distributions can be obtained by the approach proposed here.