Transformer getting hot and burning

[anil.deshpande]

I have bought a tape recorder whose rectifier was designed for 60hz
and 120 volts and I changed only the transformer in the rectifier from
120v 1 amp to
230 volts 1 ampere.
Is that okay?
If so why does my transformer becomes hot?
Thanks
Anil Deshpande

 

[Rheilly Phoull]

"anil.deshpande" <adeshpanus@yahoo.com> wrote in message
news:146c6577.0411130221.1c968537@posting.google.com...

I have bought a tape recorder whose rectifier was designed for 60hz
and 120 volts and I changed only the transformer in the rectifier from
120v 1 amp to
230 volts 1 ampere.
Is that okay?
If so why does my transformer becomes hot?
Thanks
Anil Deshpande

Sounds like the tranny might not be big enough, can you try something with
more capacity (I.e say 2amp rating) ??

--
Regards ........... Rheilly Phoull

 

[Robert Rudolf]

Hi,

I have bought a tape recorder whose rectifier was designed for 60hz
and 120 volts and I changed only the transformer in the rectifier from
120v 1 amp to
230 volts 1 ampere.
Is that okay?
If so why does my transformer becomes hot?

Is the 230V transformer designed for 50 or 60Hz? Which line frequency do
you use?
Using a 50Hz transformer on a 60Hz line _might_ cause relatively high
magnetic losses (heat), depending on the design of the transformer.

hth,

Robert

 

[Clarence]

"Robert Rudolf" <robert.rudolf@gmx.at> wrote in message
news:2vmuosF2ln9t3U1@uni-berlin.de...

Hi,

I have bought a tape recorder whose rectifier was designed for 60hz
and 120 volts and I changed only the transformer in the rectifier from
120v 1 amp to
230 volts 1 ampere.
Is that okay?
If so why does my transformer becomes hot?

Is the 230V transformer designed for 50 or 60Hz? Which line frequency do
you use?
Using a 50Hz transformer on a 60Hz line _might_ cause relatively high
magnetic losses (heat), depending on the design of the transformer.

hth,
Robert

You have it backwards Robert.

Using a 60Hz transformer on a 50Hz line _might_ cause relatively high
loss (heat), depending on the design of the transformer. (TOO LITTLE IRON!)

 

[Robert Rudolf]

Hi, Clarence

You have it backwards Robert.

Using a 60Hz transformer on a 50Hz line _might_ cause relatively high
loss (heat), depending on the design of the transformer. (TOO LITTLE IRON!)

Yea, of course - you're right. 60Hz transformers need less iron.
Normally, this should cause no problem. Only if the larger transformer
core was already at its limits the smaller one will produce too much
losses.

So, hope I didn't get anything wrong now - it's too late today.

greetings,

Robert

 

[Roger Johansson]

Robert Rudolf <robert.rudolf@gmx.at> wrote:

Using a 50Hz transformer on a 60Hz line _might_ cause relatively high
magnetic losses (heat), depending on the design of the transformer.

Add a fan to counter this effect.
That keeps the temperature down which fixes the problem.


--
Roger J.

 

[Don Kelly]

"Robert Rudolf" <robert.rudolf@gmx.at> wrote in message
news:2vneitF2oa2d9U1@uni-berlin.de...

Hi, Clarence

You have it backwards Robert.

Using a 60Hz transformer on a 50Hz line _might_ cause relatively high
loss (heat), depending on the design of the transformer. (TOO LITTLE
IRON!)

Yea, of course - you're right. 60Hz transformers need less iron.
Normally, this should cause no problem. Only if the larger transformer
core was already at its limits the smaller one will produce too much
losses.

So, hope I didn't get anything wrong now - it's too late today.

greetings,

Robert

If he has replaced the original 120V transformer with a 230V transformer, he
has done it to use at 50Hz and a relatively cheap 60Hz transformer at 50 Hz
might be well into saturation and have excessive magnetising current.
--
Don Kelly
dhky@peeshaw.ca
remove the urine to answer