Patent ID: 8680856
Filing Date: 2014-03-25
Classification: G01R

Abstract:
1. Arrangement for a potential-free measurement of currents flowing in two primary conductors arranged substantially in parallel, in opposite directions of each other, by detecting the magnetic differential field by means of a differential field sensor, wherein for reducing measuring errors, said primary conductors and said differential field sensor are disposed between two metal parts, characterized in that the two metal parts are configured as shield plates each having a web, that said webs extend on both sides of the arrangement of the primary conductors substantially in a direction parallel to the arrangement of the primary conductors, that at least one of said shield plates is configured in a U-shape in cross-sectional planes having a pair of limbs each of which extend in a longitudinal direction that is at a right angle to the U-shaped cross-sectional planes, that said two shield plates are disposed relative to each other such that the at least one limb pair of one of said two shield plates is aligned towards the other of said two shield plates while leaving one air gap each on one of said two limbs, and that said primary conductors extend in the longitudinal direction.