| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize high sensitivity detection by arranging two zero-phase current transformers each having an exciting winding and an output winding wound around a troidal core such that they have an identical through axis, connecting an exciting power supply and an exciting resistor in series across the in-phase series circuit of two exciting windings, connecting two output windings in reverse series and connecting an integrating circuit across the reverse series circuit. SOLUTION: A DC line 206 is passed through two troiclal cores 205, 206 and exciting windings 203, 204 are wound in series in-phase while output windings 207, 208 are wound in series in reverse phase to induce voltages of reverse phase. Since two troidal cores 205, 206 are employed, a slight difference in the hysteresis characteristics causes a difference in the waveform of voltages induced in the output windings 207, 208 and the difference of waveform appears across the output winding. It is integrated through an integrating circuit 210 to produce the difference of flux waveform.</p> |
