| 摘要 |
PURPOSE:To improve characteristics of a current transformer itself and to surely prevent a creep by a method wherein a current transformer is made itself to have a creep prevention facility to obstruct a current output equla to or less than a starting current. CONSTITUTION:When a load current which is a primary current flows in the primary coil winding 131a of a current transformer main body 131, a current i', flows in the secondary coil winding 131b of the current transformer main body 131 and this is entered in an arithmetic amplifier 132. With this, if a gain of the arithmetic amplifier 132 is sufficiently great, the voltage across the both terminals of the secondary coil winding 131b becomes zero, as a result, the burden of the current transformer main body 132 bocomes zero, thus, the use state becoming that of an idealistic current transformer 131. And further, since a nonlinear circuit 133 is inserted between the input and output terminals of the arithmetic amplifier 132, the relation between the primary current i', and the output voltage V0 becomes a nonlinear characteristic. |
