When the primary winding of the current transformer is connected to the circuit, the load current I1 flows; the alternating magnetic flux φ1 generated at the same frequency of I1 generates an alternating magnetic flux φ1 of the same frequency as I1, which generates an induced electromotive force E2 through the secondary winding. Since the secondary side is a closed loop, a current I2 flows and a variable magnetic flux φ2 is generated, and φ1 and φ2 pass through the same closed core to synthesize the magnetic flux φ0. Due to the action of φ0, the energy of the primary winding is transferred to the secondary winding during the current exchange process.
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