Current Transformer – OEM/ODM Manufacturer & Supplier

A high voltage current transformer is an instrument transformer used to reproduce primary current at a reduced, proportional level on a secondary circuit. The secondary output is used by metering and protection devices while enabling isolation between the primary conductor and secondary wiring.

High voltage current transformer operation is based on electromagnetic induction. Primary current produces magnetic flux in the transformer core, inducing a proportional current in the secondary winding that can be routed to meters, relays, or protection devices through secondary terminals.

High voltage current transformer units are typically used in medium- and high-voltage distribution equipment where current measurement or protection signaling is required. Common use cases include distribution switchgear, protection panels, and metering circuits associated with MV/HV feeders.

Selection is typically based on system compatibility requirements, the intended secondary circuit function (metering or protection), and integration constraints in the equipment design. Engineering teams also evaluate the wiring interface arrangement to ensure secondary circuit routing and termination practices match the equipment standard.

Secondary terminals should be wired according to the equipment’s secondary circuit diagram and terminal identification markings. Secondary circuit conductors are routed to metering or protection devices, and wiring practices should follow the applicable installation standards used for MV/HV secondary circuits in the project.