| 摘要 |
PURPOSE:To enhance detection sensitivity and environmental resistance in spite of a small size, to simplify the constitution of a sensor element and to obtain good workability, by symmetrically arranging three cores of the sensor element of a bridge circuit around three-phase electric wires at an equal distance. CONSTITUTION:Three cores 2a, 2b, 2c are arranged with respect to three-phase electric wires 1A, 1B, 1C of one set of sensor elements and constituted by winding copper wires around Co-base amorphous fine wires 3a, 3b, 3c in the same direction and connected in series. The fixed cores 2a, 2b, 2c are incorporated in a bridge circuit. When an electric leak is generated in one phase, the change in inductance is generated in the series part of the cores 2a-2c and output is obtained from the whole of the bridge circuit and detection sensitivity can be enhanced.
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