Study on the Electromagnetic current sensor for traction electro supply devices control systems

Abstract

This article is devoted to the new electromagnetic sensor design of large direct and alternating currents with expanded functionality for the electro supply devices control and management systems on electrified railways. It’s analyzed that its nonlinear magnetic circuit with longitudinal magnetization based on the magnetization curve approximation. Also it’s shown that developed sensor sensitivity depends on working air gap sizes and modulating magnetic field induction.

A device for detecting current asymmetry in a three-phase alternating current system

“…Currently, to identify the asymmetry of three-phase currents, CMC are used, having various designs based on various physical effects (on the magneto modulation effect, Hall effect, transformer effect, etc.) [5][6][7][8][9][10].…”

Mathematical models of magnetic circuits of high currents induction sensors for electric power supply systems devices of electric transport

“…The modulation magnetic circuits of the developed ISHC [2,13,14,15,16] consist of two C-shaped parallel sections with cutouts (a rod pair form) along the profile, interconnected by two ferromagnetic connecting elements made with rectangular cutouts (a rod pair form) and modulating windings arranged evenly on each rod pair of C-shaped sections and the connecting element (fig. 1).…”

“…To determine the characteristics of these sensors, it is necessary to research and develop their mathematical models. The electromagnetic circuit of the developed induction sensors of high currents (ISHC) is a circuit with distributed electrical and magnetic parameters [1][2][3][4][5][6][7][8]. These parameters include the linear values of the magnetic resistance of C-shaped ferromagnetic concentric rings, the magnetic capacitances of the gap between these rings and the longitudinal ampere-turns per unit of the angle of the magnetic circuit, the linear values of the magnetic resistance of the connecting ferromagnetic elements, the magnetic capacitances of the gap between these connecting elements and the longitudinal ampereturns of the modulation winding, per unit the lengths of these connecting elements.…”

Experimental research of magnetic circuits of current converters taking into account the nonlinearity of magnetic characteristics

“…and the dependence of the specific magnetic resistance µ ρ on the magnetic induction [12][13][14][15][16]. Since the quality of the developed calculation method depends on the correct choice of the approximation formula from the existing sets of analytical expressions, it is necessary to analyze the existing analytical expressions of magnetic characteristics and apply new formulas for approximating the magnetization curve for magnetic circuits of magnetomodulation current converters.…”