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why DC current not used in Transformer action?
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Answer Posted / rakesh punia
in dc source there is zero frequency
whereas in ac source thefrequencuy is not zero.now what is
magnetic flux ?.basically magnetic flux is no of magnetic
lines of force passing through an small area.
when this magnetic lines change or fux changes emf or
current is produced.this is being proved by faraday.in ac
this phenomenon takes place due to variable frequency while
in dc frequeency is zero thus no emmf is produced thus no
mutual induction which prime principle of any transformer,
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HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.
