Current transformers

 

Current Transformers produce output in proportion to the current flowing through the primary winding as a result of a constant potential on the primary. The Current Transformer ( C.T. ), is a type of “instrument transformer” that is designed to produce an alternating current in its secondary winding which is proportional to the current being measured in its primary. 

Current transformers reduce high voltage currents to a much lower value and provide a convenient way of safely monitoring the actual electrical current flowing in an AC transmission line using a standard ammeter. 


The principle of operation of a basic current transformer is slightly different from that of an ordinary voltage transformer. Unlike the voltage or power transformer looked at previously, the current transformer consists of only one or very few turns as it is primary winding. 

This primary winding can be of either a single flat turn, a coil of heavy-duty wire wrapped around the core, or just a conductor or bus bar placed through a central hole as shown. Read more...

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