| 摘要 |
Measuring current-voltage transformer relates to measuring engineering. Transformer includes two-winding current transformer primary winding of which is connected to source of current being measured. Secondary winding with one output is connected to inverting input of first operational amplifier to which first resistor is connected, its second output is connected to output of that operational amplifier that is output of transformer. To the output of the first operational amplifier second resistor is connected, its second output is connected to inverting input of second operational amplifier and to second output of secondary winding of current transformer. Non-inverting inputs of both operating amplifiers are connected to common point of power source. At given choice of parameters of resistors core of current transformer is not re-magnetized, and low input resistance of operative amplifier leads to decrease of level of pickup, this provides increase of accuracy of measurement. |
