To provide a current detecting method capable of accurately detecting current value, regardless of the scattering of primary side current versus secondary side voltage characteristics of a current transformer and detecting current range wider than in the conventional methods, even if using the core with the same cross-sectional area and a small current detector using the method at a low cost.
In a device for measuring a current value which flows from a secondary output voltage of the current transformer to a primary side measured conductor, a known primary conductor current with different amplitude is sent to the transformer, used in the device at the manufacturing stage. The secondary output voltage of the transformer, according to the sent current, is measured. Data for calculating primary side measured current value by using the secondary output voltage of the transformer is extracted from each device, and the extracted data are stored in the device side of each device. When the current flowing in the primary side conductor is measured using the device, the primary side measured current is calculated from the secondary output voltage of the transformer by using the data stored in each device.
IMAMOTO MASAO
FURUMOTO TETSUO
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