Posts Tagged ‘current transformers’

Current Transformers

August 2nd, 2013 | 1 Comment | Posted in Electrical distribution
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Hi there, here’s the last but one part of Nasir’s tutorial on transformers. The last one will be about “3 Phase Transformers”. Hope you’ll enjoy it and find it helpful.


Current transformers can be defined as the type of instrumental transformers which are used to convert very high currents which can burn or cause damage to measuring instruments like ammeters or other small devices like relays, into lower current values, which are in direct proportion to their higher, primary current values.

In this way, current can be easily measured through the device, and as it is directly proportional to the original high current, the true and precise values of current can also be found without damaging the instrument.

The secondary current differs in the phase angle from the primary current in a very small value which can almost be approximated to zero if the direction of the connections are appropriate.

On the basis of the output supply, the current transformers can be classified into two categories:

  1. Measuring Type Current Transformers
  2. Protection Type Current Transformers


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