News

Working Principle and Types of Current Transformers

Posted by mb

I. Core Working Principle

A current transformer induces an alternating current in its secondary winding. This current is proportional to the primary winding current. We use a known turns ratio to establish a definitive correlation between primary and secondary currents. Thus, measuring the secondary current allows us to accurately calculate the primary current.

II. Design Features of Primary Winding

Typically, engineers design the primary winding of a current transformer for large currents. Specifically, it handles the full-load current of the monitored primary circuit. Therefore, the primary can be a single turn, a heavy-duty coil, or even a single conductor passing directly through the transformer core center.

Current transformers connect in series with the load in the primary circuit. So people sometimes refer to them as series transformers.

III. Design Logic of Secondary Winding

Engineers design the secondary winding with far more turns. This generates a suitable current magnitude. It facilitates convenient and precise measurement.

IV. Core Structure and Material Selection

Manufacturers commonly use laminated low-loss magnetic materials for the core. Toroidal cores are also widely adopted in practice. Any core structure has a large cross-sectional area. This reduces magnetic flux density. The design enables the transformer to output stable current. This current depends as little as possible on the connected load.

Working Principle and Types of Current Transformers

I. Core Working Principle

II. Design Features of Primary Winding

III. Design Logic of Secondary Winding

IV. Core Structure and Material Selection

Recent Posts

Indoor vs Outdoor Current Transformer Differences

Split Core vs Solid Core Current Transformer

Combined Instrument Transformer Working Principle

If you are interested in our products, feel free to contact us anytime!

Working Principle and Types of Current Transformers

I. Core Working Principle

II. Design Features of Primary Winding

III. Design Logic of Secondary Winding

IV. Core Structure and Material Selection

Recent Posts

Indoor vs Outdoor Current Transformer Differences

Split Core vs Solid Core Current Transformer

Combined Instrument Transformer Working Principle

If you are interested in our products, feel free to contact us anytime!

We value your privacy

Customise Consent Preferences