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As current flows through a conductor (wire) an electromagnetic field is produced. A CT is just a coil of wire that surrounds the conductor with the current flow. The EMF produced induces a voltage in the CT and that is sensed by some type of device to determine the amount of current in the primary conductor. Usually used when a large current is fed through the primary and you want to know what that is without measuring it directly. ADDITIONAL: THE MOST NEGLECTED ANSWER SPECIALLY IN DEFINING THE PURPOSE AND USE OF INSTRUMENT Transformers (CURRENT AND POTENTIAL OR VOLTAGE TRANSFORMER) IS PROTECTION.

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17y ago

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