| 摘要 |
This current measurement device (10) includes a conductor (110), a first terminal block (100), a pair of detection coils (120a, 120b) and a current calculator (300). A magnetic field, proportional to the magnitude of a to-be-measured current that is conducted, is generated around the conductor (110). The first terminal block (100) has a placement surface (F) on which the conductor (110) is disposed. The pair of detection coils (120a, 120b) has the configuration, connected in series and in opposite polarity with respect to each other, and disposed on the placement surface (F) of the first terminal block (100) such that the conductor (110) is between the pair of detection coils (120a, 120b), and each coil is spaced from the conductor (110) by an insulating distance. The detection coils (120a, 120b) output an inductive voltage signal produced by the magnetic field generated by the conductor (110) and an external magnetic field which is magnetic noise. A current calculator (300) calculates the value of the to-be-measured current on the basis of the inductive voltage signals from the pair of detection coils (120a, 120b). |
