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 Posted / 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.
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