Current transformer working principle and effect

- Oct 16, 2019-

In the route of power supply, the magnitude of the current varies greatly, ranging from a few amps to more than 100,000 amps. In order to facilitate the accurate measurement of instruments and instruments, it is necessary to change to a more consistent current amount, and the working voltage on the other supply circuit line is relatively high. For example, accurate measurement is accurate for instruments, instruments, and people. Risky. Therefore, the design of the current transformer has the effect of variable current and electrical equipment protection.

The pointer current meter display instrument is mostly ampere-level, so the current current of the current transformer is mostly ampere-level (such as 5A, etc.), and the data signal sampled by the computer is usually mAh level (0~5V, 4 to 20 mA, etc.). Therefore, a small current transformer (again current amount is mAh level) is selected as a road bridge for the current transformer and the computer to sample the data signal, and the current amount is re-converted.

 

The current transformer is composed of a plurality of electromagnetic coils, a re-solenoid coil, an iron core, an insulation support point, and a group outlet terminal. The iron core of the current transformer is formed by stacking a ferrite core, and the plurality of electromagnetic coils are connected in series with the main power circuit, and according to the measured current amount I1, it causes alternating magnetic flux in the iron core to make electromagnetic again. The coil magnetically induces a relative amount of recurrent current I2 (its rated voltage is 5A). If the excitation regulator wear is ignored, then I1n1 = I2n2, where n1 and n2 are each one, and the number of turns of the solenoid coil is again. The current transformer has a current conversion ratio of K=I1/I2=n2/n1.

The pointer current meter display instrument is mostly ampere-level, so the current current of the current transformer is mostly ampere-level (such as 5A, etc.), and the data signal sampled by the computer is usually mAh level (0~5V, 4 to 20 mA, etc.). Therefore, a small current transformer (again current amount is mAh level) is selected as a road bridge for the current transformer and the computer to sample the data signal, and the current amount is re-converted.


The current transformer is composed of a plurality of electromagnetic coils, a re-solenoid coil, an iron core, an insulation support point, and a group outlet terminal. The iron core of the current transformer is formed by stacking a ferrite core, and the plurality of electromagnetic coils are connected in series with the main power circuit, and according to the measured current amount I1, it causes alternating magnetic flux in the iron core to make electromagnetic again. The coil magnetically induces a relative amount of recurrent current I2 (its rated voltage is 5A). If the excitation regulator wear is ignored, then I1n1 = I2n2, where n1 and n2 are each one, and the number of turns of the solenoid coil is again. The current transformer has a current conversion ratio of K=I1/I2=n2/n1.


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