Patent ID: 9599641
Date: 2017-03-21
CPC Classifications: G01R

Claim:
1. A current detection device comprising: a plurality of air-cored coils that are attached to conductors for a plurality of phases, respectively, the conductors being supported by an insulator and housed in a tank made of a ferromagnetic material; a plurality of output-voltage detection circuits that detect an output voltage of the air-cored coil for each phase; and a correction processing circuit that calculates an output-voltage correction value for each phase on a basis of an output voltage of the air-cored coil for each phase, and calculates and outputs current flowing in the conductor for each phase on a basis of the output-voltage correction value, wherein the correction processing circuit obtains, by dividing an output voltage of the air-cored coil for each phase by a transformation ratio of the air-cored coil, a current value level, which is a temporary value of current flowing in the conductor for the phase, and calculates the output-voltage correction value for each phase in accordance with the current value level of each phase.