What is the function of current transformer?

Current transformer converts large current into small current for easy measurement. The working principle is based on electromagnetic induction, the primary winding induces a magnetic field, and the secondary winding produces a smaller current proportional to the primary winding current. Benefits include extended measurement range, improved accuracy, enhanced safety, providing isolation and ease of installation. It has a wide range of applications such as power system measurement, motor monitoring and overcurrent protection.

Current transformer: function and principle

Function:
Current mutual inductance A transducer is an electrical device whose function is to convert a large current into a smaller current so that it can be measured conveniently and safely.

Principle:
The working principle of current transformer is based on the law of electromagnetic induction. It consists of an iron core and two windings wound around the iron core:

• Primary winding: is connected in series with the measured current and is responsible for inducing the magnetic field.
• Secondary Winding: Connected to a measuring instrument, such as an ammeter or relay, the induced magnetic field produces a current.

When a current flows through the primary winding, it generates a magnetic field that is proportional to the intensity of the current. This magnetic field induces a current in the secondary winding, which is proportional to, but smaller than, the current in the primary winding. Current transformers can therefore convert large currents without overloading the measuring instrument.

Advantages:

• Expand the ammeter measurement range
• Improve the safety of measurement accuracy
• Provide galvanic isolation
• Easy to install and maintain

Applications:
Current transformers are widely used in a variety of industrial and commercial applications, including:

• Power system measurement
• Motor current monitoring
• Overcurrent protection
• Energy measurement

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