Working principle of residual current transformer

- Jun 26, 2020-

The residual current transformer is a detection element. Its main function is to convert the ground fault current I1 detected by the primary circuit into electric shock, leakage, etc. into the output voltage E2 of the secondary circuit. E2 is applied to the trip coil of the residual current release On the top, push the tripping device action, or apply the signal to the tripping coil after amplifying the signal through the signal amplifying device to make the tripping device act.

Residual current transformer is an important component of the residual current protection device, and its working performance will directly affect the performance and reliability of the residual current protection device. The current transformer of the residual protection and protection device generally adopts a through-type ring transformer, that is, the main circuit wire (primary circuit wire N1) passes through the middle of the transformer, and the secondary circuit wire (N2) is wound on the ring core and passes The core of the transformer realizes the electromagnetic coupling between the primary circuit and the secondary circuit.