CURRENT SENSING AND/OR MEASUREMENT - APPARATUS AND METHOD

摘要

A current sensing assembly has first and second arms of a magnetically permeable material arranged to enclose a cable carrying an electrical current to be sensed or measured by coming together at joints, with the arms and joints forming a magnetic circuit around the cable. At least one of the joints houses a magnetic sensor, such as a Hall-effect sensor, which is used to detect or measure the current. A cuff of a magnetically permeable material is arranged and positioned to substantially enclose the joint housing the sensor, when the arms are in place around the cable, in order to shield the first magnetic field sensor from stray magnetic fields. There may be a gap between the arms at the joint in order to prevent the field generated by the current to be measured being shunted through the arms away from the sensor and the cuff may have an aperture directed towards the cable to prevent the sensor being shielded from the field generated by the current. Devices and methods using the current sensing assembly are detailed.