I have a transformer whose primary operates at 230V, 50Hz
for which the secondary voltage will be 12V, 50Hz. What
will be the secondary voltage if the primary is fed with
400V, 8KHZ Signal?
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Answer / pised
Assume that the transformer is typical iron-cored stepdown
transformer.
The actual output result will not be 20.86 volts calculated
with straight ratio and the transformer will likely be
destroyed due to the following factors:
1. Iron core has lower frequency response and that makes it
good only for 50-60Hz. 8,000Hz frequency will not get
transformed properly because the magnetic flux in iron core
will be saturated. The primary coil will receive
equivalent to direct current voltage therefore is likely to
overheat.
2. The insulation of a 230v transformer will not withstand
400v therefore ground leakage is very likely.
3. The size of copper wire and number of winding suitable
for the current rating designed for 230v will draw more
power into the coil when connected to 400v, again,
overheated.
| Is This Answer Correct ? | 38 Yes | 1 No |
Answer / anshul rawal
3/23volts or appro .13 volts. assume xmer to be ideal one
with no resistance in windings,nohysteresis loss etc, at
80khz the frequency is 160 times 50khz ,so current in
primary is 160 times less than at 50hz as inductive
reactance of primary ,ie 2 pi f l is 160 times more. as
current is 160 times less so is magneti flux in core,and so
is induced emf in secondary. if hysteresis loss and eddy
current loss r considered , then it is even less
| Is This Answer Correct ? | 4 Yes | 2 No |
Answer / raj(b.e.electrical)
e1/e2=e3/e4
230/12=400/e4
e4=400/19.16667
e4=20.869v
so ans is : 20.869v
freq remain same.
| Is This Answer Correct ? | 4 Yes | 5 No |
Answer / prashant
o/p voltage will be 20.8 volt, but due to very high
freguency 8 Khz hytresis loss & edd current will be
increased because this loss is directly related to
frequency.
| Is This Answer Correct ? | 5 Yes | 7 No |
Answer / shyamkr
20.869v,8kHz is the voltage and frequency of secondary.
| Is This Answer Correct ? | 5 Yes | 10 No |
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