Why Current Transformer is connected in Series?
A current transformer (CT) is connected in series with the circuit for the purpose of measuring (or) monitoring the current flowing through it.
In a series connection, the same current runs through the CT’s primary winding as it does in the main conductor, allowing for accurate measurement.
A CT’s primary is typically just one conductor (or a few turns), therefore connecting it in series assures that it senses the full load current.
The CT reduces high current to a low, safe level for instruments & relays, while electrically isolating the measurement circuit from the high voltage system.
If it were connected in parallel, it would measure voltage rather than current and could be damaged due to the extremely low impedance.
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