Differential current sensor for detecting faults on electrical circuits, comprises inner ring core with compensating measurement windings enclosed by trunking with further compensating windings

摘要

The differential current sensor (1) has an inner ring laminated core (2) with measurement windings (3,9) which are wound in the opposite sense and connected in parallel for compensation purposes. The measurement core and windings are enclosed by metal trunking (4) which also has compensating windings (5) wound in opposing senses. Measurement connections are brought out through the trunking which has a rectangular window for the line bars