110/220v tranformer pics

[Marvin]

Hi, here in Brazil we use 110-127v AC.
I found a tranformer 110/220 - 220-110v rated to 1000va (without notice of power factor). Can i use with a 220 v compressor without worries ?
pics:
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010039%7E0.JPG
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010040.JPG
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010043.JPG
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010041.JPG

[yngndrw]

Well, you would have to use it backwards .. (It is 220V -> 110V, not the 110V -> 227V that you require) So make sure that you wire it up the correct way round !

It is rated at 1000VA, therefore it should run a 4.5A 220V compressor. However the startup current of your compressor may cause you problems.

Can you get the peak ratings for this transformer ?

[sl4ck]

hehehe, até parece que estou a ler um post portugues pela foto :)

Translation: Looks i'm reading a portuguese post by the photo :)

[RussC]

The voltage is fine, but am I reading it right, its only 1VA? Thats not good, as thats only 1A at 220V, or 220W. Thats not enough. Although, that xfrmr looks big enough for alot more than 220VA?

RussC

[Marvin]

Thanks for the replies.
Traslating the label :
Input 127 v or 220 v
Output 127 v or 220 v
Power 1000 VA or 1 KVA:)
Frequence 60 HZ
tested and it is fine :
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010048%7E0.JPG
the other label : usage in duplex or triplex refrigerators, cloth driers and other that i cant translate
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010043.JPG

[RussC]

Ummm,
I guess Im not understanding how 1.000=1000??????:confused: '

RussC

[yngndrw]

Ummm,
I guess Im not understanding how 1.000=1000??????:confused: '

RussC
In some countrys, they use '.' as the comma in '1,000' etc .. And they use a comma in place of a decimal point.

[Marvin]

In some countrys, they use '.' as the comma in '1,000' etc .. And they use a comma in place of a decimal point.
that is it.:)

[Marvin]

Well, you would have to use it backwards .. (It is 220V -> 110V, not the 110V -> 227V that you require) So make sure that you wire it up the correct way round !

It is rated at 1000VA, therefore it should run a 4.5A 220V compressor. However the startup current of your compressor may cause you problems.

Can you get the peak ratings for this transformer ?
Peak 250v and 10 A.

[sl4ck]

Thanks for the replies.
the other label : usage in duplex or triplex refrigerators, cloth driers and other that i cant translate
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010043.JPG

...popcorn machine, hair dryer max 1000w

[yngndrw]

Peak 250v and 10 A.
With my knowledge of electronics and electrical stuff in general, I would say that this would be fne for starting a compressor on, just make sure that the 'running current' is less than 4.5A.

Use the correct fuses and all. ;)

[Comp-Freak]

A 220v compressor works @ 50 Hz instead of the 60 Hz from the transformer. So I don't think you can use the transformer without a (dunno how you cal it in English) device that makes 60 to 50 Hz.

[yngndrw]

Some countrys who run 220V use 60Hz anyway, so not all 220V compressors are 50Hz.

Anyhow, I dont think the differnce of 10Hz would make that much differnce, I mean .. It would make the compreessor work a little bit harder / faster .. But I dont personally think that it would cause a problem.

[SexyMF]

Marvin, is your country 50 or 60Hz power?.
What is the compressor frequency?


A 220v compressor works @ 50 Hz instead of the 60 Hz from the transformer. So I don't think you can use the transformer without a (dunno how you cal it in English) device that makes 60 to 50 Hz.

A transformer cares little if it receives 50 or 60Hz power. The rating and efficiency will change slightly due to the different flux coupling since flux is tied to rate of change. Put 50Hz in and you get 50Hz out.

[RussC]

There is just a power loss going from 60 to 50hz. The power loss is porportional to the percentage of frequncy lost. So ~16% power loss. So a 1kva xfrm is now 830kva.

RussC

[Marvin]

Marvin, is your country 50 or 60Hz power?.
What is the compressor frequency?



A transformer cares little if it receives 50 or 60Hz power. The rating and efficiency will change slightly due to the different flux coupling since flux is tied to rate of change. Put 50Hz in and you get 50Hz out.

thank you friend, here we use 60 hz.
Here in my house i have a 3 phase capacity (330 v)
110 v in each phase. sorry if i am not expressing correctly. :rolleyes:
i take a pic of the outlet of the tranformer and i think the peak is 250v 10 A
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010049%7E0.JPG

[Comp-Freak]

A transformer cares little if it receives 50 or 60Hz power. The rating and efficiency will change slightly due to the different flux coupling since flux is tied to rate of change. Put 50Hz in and you get 50Hz out.I know, that's what I meant ;)

@ Marvin, it's indeed max 250v, 10A. And output will be 220v, 60Hz.

[SexyMF]

Here in my house i have a 3 phase capacity (330 v)

Excellent. I'm qualified for 3 phase tinkering (I'm an industrial electronics engineer).

Try that compressor on the transformer and see how it goes.

[hipro5]

Have in mind that nowadays, there is NOT 220Volts BUT 230Volts instead.....Most of the devices - if not all - work with 230Volts AC now......;)

[Marvin]

thanks for the replying. But it can handle 4.5 Amp at 220 v ok ?
But when the compressor starts how many amps it draws above the normal ?
Thanks for all

[hipro5]

As I see on photo, it must be an "autotransformer" and NOT a "transformer"......To see if it is an "autotransformer" check with your multimeter at Ohms and see if 110Volts(120) is short-circuited with the 220Volts WITHOUT pluging it into 110Volts.....If yes, then it's not a transformer.......Although it's an autotransformer - not seperating first with second rounds of coil - it can handle quit high currents on start uping a device at it's secondary output......;)

[Marvin]

As I see on photo, it must be an "autotransformer" and NOT a "transformer"......To see if it is an "autotransformer" check with your multimeter at Ohms and see if 110Volts(120) is short-circuited with the 220Volts WITHOUT pluging it into 110Volts.....If yes, then it's not a transformer.......Although it's an autotransformer - not seperating first with second rounds of coil - it can handle quit high currents on start uping a device at it's secondary output......;)
Thanks you hipro. I have justed lost my multimeter in the test:mad: (not yours:D ), so i couldnt verify this, but i saw a small label that says is a Auto-transformer;)
So Can i be safe with the compressor ?
sorry but i didnt understood your text very well.
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010003%7E0.JPG
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010004.JPG

[hipro5]

Yes it could handle the start pu of a compressor.....

EDIT: Which compressor though!?......I hope not 1hp......coz your autotransformer is 1000VA and not 1000Watts, thas means it's about 800Watts or less......

[yngndrw]

Have in mind that nowadays, there is NOT 220Volts BUT 230Volts instead.....Most of the devices - if not all - work with 230Volts AC now......;)
Well it doesnt really make much differnce TBH, In England, we used to have 240V, untill we lowered it to 230V for some odd reason. That said, after measuring the voltage in my house, I actually get 250V. But it doesnt really affect anything.

[Marvin]

i was sneaking at my granpa house and find a new one:D
it is rated 2000VA
maybe 9A at 220v ?
I think i can use a 1 HP compressor:)
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010006%7E1.JPG
http://www.forumpcs.com.br/galeria/albums/userpics/10827/P1010009%7E1.JPG

[hipro5]

Yes.....now you can........:D

[RussC]

the votage you read will depend on load at the time of measurement. Depending on whats on or off, you're voltage will vary some.

RussC

Well it doesnt really make much differnce TBH, In England, we used to have 240V, untill we lowered it to 230V for some odd reason. That said, after measuring the voltage in my house, I actually get 250V. But it doesnt really affect anything.