Current Transformer

Applications of Current Transformer

To measure the current in another circuit, utilize a Current Transformer (CT). Cross-national power grid monitoring of high-voltage lines is done globally via CTs. A CT is made to measure current in its primary winding and produce an alternating current in its secondary winding that is proportionate to that current.

Structure of Current Transformers

A magnetic iron core, a primary winding wound on this core, and a secondary winding wound on this primary winding in the opposite direction make up the three main components of a current transformer. The magnetic iron core experiences a magnetic flux due to the current flowing through the primary winding. The secondary winding experiences an induced voltage due to the magnetic flux present in the core. Because the current flowing through the secondary circuit is opposed to the winding direction, the measuring instrument connected in parallel to the secondary winding produces a magnetic flux in the magnetic iron core in the opposite direction. The magnetic flux produced by the current flowing through the primary winding is balanced by this magnetic flux. Because of this, the current's secondary ends.