Article | REF: D4720 V1

Instrument transformers - General information. Theory. How it works

Author: Jean-Pierre DUPRAZ

Publication date: December 10, 1990

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2. Theory and operation for AC measurements

2.1 Current transformer

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2.1.1 Principle. Modeling

From an electromagnetic point of view, the simplest transformer consists of three main parts (figure 3 ):

  • a toroidal CM magnetic circuit;

  • the secondary winding S wound on this toroid ;

  • the primary winding P, which is usually reduced to a single bar passing through...

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Theory and operation for AC measurements