why C.T secondary are rated 5A generally?
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Answer Posted / arun
The CT has separate primary and secondary windings. The
primary winding which consists of few turns of heavy wire,
wound on a laminated iron core is connected in series with
one of the line wires. The secondary winding consists of a
greater number of turns of a smaller size of wire. The
primary and secondary windings are wound on the same core.
The current rating of the primary winding of a CT is 100 A.
The primary winding has three turns and the secondary
winding has 60 turns. The secondary winding has the
standard current rating of 5A;therefore the ratio between
the primary and secondary current is 100/5 or 20/1.The
primary current is 20 times greater than the secondary
current. Since the secondary windings 60 turns and the
primary winding has 3 turns, the secondary winding has 20
times as many turns as the primary winding. For a CT the
ratio of primary to secondary currents is inversely
proportional to the ratio of primary to secondary
turns..this 5A s the standard fixed by the electricity
corporation and they folow t..so its a convention to follow
this standarrdd
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