| 摘要 |
The invention is related to a current transducer based on the measurement of magnetic flux density and a method for calibrating the same. The transducer comprises a frame structure (5, 8), adapted to said frame structure (5, 8), an essentially ring-shaped magnetic circuit (2) having the annular shape gapped to form an air gap (4) and concentrate the magnetic flux to the air gap (4), said ring-shaped magnetic circuit (2) incorporating an aperture (10) through which the current conductor (6, 7) to be measured can be routed, a Hall-effect device (1) insertable in said air gap, and an electromagnetic shield structure (3) surrounding the frame structure to the end of preventing external interference fields from affecting the Hall-effect device. According to the invention the electromagnetic shield structure (3) is made of a material essentially similar to that of the magnetic circuit (2), and both the magnetic circuit (2) and the body structure (5) are so shaped as to be capable of accommodating either a straight current conductor (6), or alternatively, a winding structure (7) with which current measurement sensitivity can be multiplied. |
