The purpose of this paper is to give a basis for developing a current sensor which can contribute to the improvement of reliability in power supplies by detecting faint faults early in the deterioration of insulation in distribution lines, Thus, we develop a method of detecting the zero-sequence current: (i) Each current sensor of the same detection accuracy is installed to each line of the three phase and (ii) Zero-sequence current is identified as a summation of the output signal in each sensor. The detection performance which can be achieved is: For the main current of 100 A, we can detect the zero-sequence current of 0.1 A with the accuracy of 3% regarding the 100% error.
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