| 摘要 |
PURPOSE:To utilize less magnetic flux, less size of core and to eliminate temperature dependence of a magneto electro transducer by a method wherein a sensed signal of the magneto electro transducer at the current transformer is emploied as a controling signal by which a current flowing in a detector winding is controlled. CONSTITUTION:Magnetic field 10 in a core 9 is generated by a current flowing in a conductor 8. Magnetic field 10 is picked up by a magneto electro transducer 1 and the sensed signal is amplified by a differential amplifier 13 and the output of the amplifier 13 generate the current, in the detector winding 11 on the core 9, by which mangetic field is generated so that magnetic field 10 in the core 9 may be concelled. Strength of magnetic field 10 is sensed by a voltage between both ends of a resister 14 which is connected in series with the winding 11. By that method less magnetic field in the core 9 is needed and large cross section of core 9 is not necessary. And effect due to temprature change is eliminated bacause a magneto electro transducer 1 is not to detect an absolute value. |
