3. Current sensors based on direct induction measurement

3.1 Principle of direct open-loop measurement

The principle, based on the proportionality between the induction field B and the current that creates it I, is shown in figure 8 . An induction sensor is placed in the air gap of the magnetic circuit. It measures the induction field created by the passing current I. The role of the magnetic circuit is to focus the field in the air gap, which increases its sensitivity and limits the influence of the central conductor's decentralization. The magnetic circuit must have low losses to avoid overheating, and a low remanent field.