Abstract
In this paper, experimental works and theoretical analysis are presented to analyze the influence of the conductor permeability on the precision of yokeless current sensors. The results of finite-element method (FEM) fit well the measured field values around the conductor. Finally we evaluate the difference in magnetic fields distribution around non-magnetic and magnetic conductor. The calculated values show that the permeability of the ferromagnetic conductor significally affects the reading of the electric current sensors even at DC.
Highlights
Large electric currents are often measured by yokeless current transducers, which have small size and low price and do not suffer from yoke saturation.[1,2] In the case that the measured current has DC component, Rogowski coil cannot be used and a differential magnetic sensor on the surface of the measured conductor[3] or inside the conductor[4] is typical solution
In this paper we study the effect of the busbar permeability on the accuracy of the current transducers
Solid iron and copper were used for conductor material
Summary
Large electric currents are often measured by yokeless current transducers, which have small size and low price and do not suffer from yoke saturation.[1,2] In the case that the measured current has DC component, Rogowski coil cannot be used and a differential magnetic sensor on the surface of the measured conductor[3] or inside the conductor[4] is typical solution. The calculations are done by Finite Element Modeling (FEM) This can be used to optimize the location and number of magnetic sensors to achieve minimum frequency dependence and minimum influence of external currents.
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