US 11,988,691 B2
Current measurement device, current measurement method, and non-transitory computer readable storage medium
Kazuma Takenaka, Musashino (JP); Kotaro Ogawa, Musashino (JP); Minako Terao, Musashino (JP); Naoki Noguchi, Musashino (JP); Saki Kobako, Musashino (JP); Fumitake Terao, Musashino (JP); and Satoshi Yoshitake, Musashino (JP)
Assigned to Yokogawa Electric Corporation, Tokyo (JP)
Appl. No. 17/620,196
Filed by Yokogawa Electric Corporation, Tokyo (JP)
PCT Filed Jun. 17, 2020, PCT No. PCT/JP2020/023735
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2020/256008, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 2019-114925 (JP), filed on Jun. 20, 2019.
Prior Publication US 2022/0244295 A1, Aug. 4, 2022
Int. Cl. G01R 15/20 (2006.01); G01R 19/25 (2006.01); G01R 31/58 (2020.01)
CPC G01R 15/202 (2013.01) [G01R 19/2506 (2013.01); G01R 31/58 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A current measurement device for measuring a current flowing through a conductor to be measured, the current measurement device comprising:
a first sensor configured to detect a direct current magnetic field and a low-frequency alternating current magnetic field generated due to the current flowing through the conductor to be measured;
a second sensor configured to detect alternating current magnetic fields from a low frequency to a high frequency generated due to the current flowing through the conductor to be measured;
a first calculator configured to calculate the current flowing through the conductor to be measured by calculating a product of a distance between the first sensor and the conductor to be measured, a detection result of the first sensor, and a constant, using distance information indicating the distance;
a second calculator configured to calculate the current flowing through the conductor to be measured from a detection result of the second sensor; and
a synthesizer configured to synthesize a calculation result of the first calculator with a calculation result of the second calculator.