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Why are Current Transformers Necessary?

Power systems are wide-ranging and complex in nature. You cannot actually see electricity, but you can understand how it operates. One of the important elements of an electrical power system is the current transformer. At Midwest Current Transformer, our focus is on manufacturing standard and custom transformers to fulfill the requirements of our customers.

Some important information about current transformers is explained below.

The Basics of Current Transformers

A current transformer generates alternating current in its secondary, which is proportional to the alternating current in its primary. It is used when a voltage or current is too high to directly measure. The generated secondary current is that ideal for processing and electronic equipment are measuring instruments.

High-voltage current reduction enables a convenient method of safely monitoring the electrical current actually flowing in an AC transmission line through the use of the standard ammeter.

There is a difference between an electrical current transformer and a voltage or power transformer. An electrical current transformer has only one or a very few number of turns with its primary winding. It is also not dependent on the secondary load current but rather managed by an external load from making it different from a voltage transformer. The current transformer ratio is equivalent to the number of secondary turns. This ratio is determined from the primary conductor making one pass through the transformer window.

Classifications and Types

There are two general types of current transformers. One is a protective current transformer used with protection equipment, such as relays, trip coils, etc. The other is a measuring current transformer for use with measuring devices to measure the magnitude of energy, current, and power.

The three standard types of current transformers include bar type, wound type, and window.

Bar type

This type of current transformer includes a bar suitable material and size utilized as the primary winding, equal to a single turn.

Wound type

This type of current transformer has two separate windings (secondary and primary) located on a magnetic steel core with various turns according to the design.

Window(toroidal) type

This type of current transformer does not have a primary winding but instead an opening within the core, and in this opening the conductor that carries the primary load current.

It is important for your facility to have the required equipment, including the proper electrical transformers.

To learn about the exceptional current transformer products we offer a Midwest Current Transformer, give us a call today at 800.893.4047 or send us an email at This email address is being protected from spambots. You need JavaScript enabled to view it.

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How Does A Current Transformer Work?