[Amps] 3 phase transformers on single phase - advice pls?

[Carl]

It wont work with my 5 hp 2 stage compressor,  South Bend lathe, milling 
machine, or MIG and TIG welders. With motors they lose a lot of torque.

If I ever get a surplused AM BC transmitter I'll give it another try

Carl
KM1H


----- Original Message ----- 
From: "Paul Kraemer" <elespe at lisco.com>
To: "Carl" <km1h at jeremy.mv.com>; "DAVE WHITE" 
<mausoptik at btinternet.com>; <amps at contesting.com>
Cc: <pennyanddavid at btinternet.com>
Sent: Monday, November 17, 2008 2:55 PM
Subject: Re: [Amps] 3 phase transformers on single phase - advice pls?


> Carl
> Many cases you don't even need the motor in the phase converter
> The three phase transformer will problably work fine with just the 
> capacitor to the wild leg which was already suggested. Especially 
> since it will be lightly loaded.
> Has worked on motors I have tried anyway.
> Remember many large single phase motors are close to a 3 phase motor 
> with addition of capacitor bank.
> Paul K0UYA
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: "DAVE WHITE" <mausoptik at btinternet.com>; <amps at contesting.com>
> Cc: <pennyanddavid at btinternet.com>
> Sent: Monday, November 17, 2008 1:08 PM
> Subject: Re: [Amps] 3 phase transformers on single phase - advice pls?
>
>
>>I run my 3 phase 208V shop equipment on 240V single phase. A 7.5hp 3
>> phase motor and a compensating cap are used to achieve this. The 
>> motor
>> is used as an idler so it isnt performing any work. There should be
>> plenty of Internet info available. Dedicated phase converters are
>> available but expensive.
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message ----- 
>> From: "DAVE WHITE" <mausoptik at btinternet.com>
>> To: <amps at contesting.com>
>> Cc: <pennyanddavid at btinternet.com>
>> Sent: Monday, November 17, 2008 10:49 AM
>> Subject: [Amps] 3 phase transformers on single phase - advice pls?
>>
>>
>>> Guys
>>>
>>> I'm sure I should know the answer to this, but just can't seem to 
>>> find
>>> anything in my literature or on the web. A friend (G7ODR, cc'd on 
>>> this
>>> email) and I have scratched our heads, but the more we discuss the
>>> problem, the more complex it becomes.....
>>>
>>> If I use a 3 phase transformer (either a 380v or 415v primary) on a
>>> 240v single phase power supply, then what will happen in the
>>> secondaries?
>>>
>>> I think the transformers that I have access to are delta input and
>>> star output. They're open 3-bobbin jobs rather than potted or
>>> enclosed.
>>>
>>> Can I wind the secondaries in series without overloading the
>>> insulation?
>>> Could I wind them in parallel? Would I hit core saturation problems?
>>>
>>> So, to put a few figures on it, if it's a 12kva 3 phase 380v in, 6kv
>>> out, what would happen with the various permutations if I try to 
>>> wire
>>> it onto 240v single phase?
>>>
>>> I'm actually looking for 4.5kv RMS out at 10kva and can get a single
>>> phase one custom wound, but at a price (£950 from TEC). Anyone in 
>>> the
>>> UK know of a cheaper but quality source?
>>>
>>> Phone a friend, ask the audience etc.... ;-)
>>>
>>> Any ideas appreciated.
>>>
>>> cheers
>>>
>>> Dave G0OIL / K2MOO
>>>
>>> _______________________________________________
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>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>
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>
>