subject:"\[RE\-wrenches\] Large transformer losses"

[RE-wrenches] Large transformer losses

2024-05-06 Thread Steven Lawrence via RE-wrenches

>
>
> Hi Jay,


A 75kVA low voltage transformer will have roughly 0.3% iron core losses and
have an efficiency loss of roughly 2%.  It depends on when the transformer
was made and what efficiency standard it was adhered to.  the manufacturer
should be able to provide you with the testing results if you provide the
serial number.

What's this application?  The model number you provide is 600V to
120V/240V.  I wouldn't expect a drop from the street to use this type of
transformer.

-Steven
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Re: [RE-wrenches] Large transformer losses

2024-04-26 Thread William Miller via RE-wrenches

Should be easy enough to look up on the manufacturer’s website.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Fri, Apr 26, 2024 at 3:54 PM Jay via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hi all.
>
> Anyone know what the tare loss and efficiency is of a 75 kw transformer?
> And it would be run mostly at 1-10kw max.
>
> This one specifically.
> hammond SG3L0075PE
>
> I’m just curious about it. The situation is 240vac grid at the street,
> 600’ to the house 400 amps.
>
>
> Why 400 amps on a house with propane heat, cooking, water heater, dryer
> and no AC.
> I don’t know.
>
> Thanks
> Jay
>
>
>
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Re: [RE-wrenches] Large transformer losses

2024-04-26 Thread Jay via RE-wrenches

According to the nameplate 6% @ 170°cOn Apr 26, 2024, at 4:33 PM, Darryl Thayer via RE-wrenches  wrote:Do you know the transformer impedance?On Fri, Apr 26, 2024, 5:54 PM Jay via RE-wrenches  wrote:Hi all. 

Anyone know what the tare loss and efficiency is of a 75 kw transformer?
And it would be run mostly at 1-10kw max. 

This one specifically. 
hammond SG3L0075PE

I’m just curious about it. The situation is 240vac grid at the street, 600’ to the house 400 amps. 


Why 400 amps on a house with propane heat, cooking, water heater, dryer and no AC. 
I don’t know. 

Thanks
Jay



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Re: [RE-wrenches] Large transformer losses

2024-04-26 Thread Darryl Thayer via RE-wrenches

Do you know the transformer impedance?

On Fri, Apr 26, 2024, 5:54 PM Jay via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hi all.
>
> Anyone know what the tare loss and efficiency is of a 75 kw transformer?
> And it would be run mostly at 1-10kw max.
>
> This one specifically.
> hammond SG3L0075PE
>
> I’m just curious about it. The situation is 240vac grid at the street,
> 600’ to the house 400 amps.
>
>
> Why 400 amps on a house with propane heat, cooking, water heater, dryer
> and no AC.
> I don’t know.
>
> Thanks
> Jay
>
>
>
> ___
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
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Re: [RE-wrenches] Large transformer losses

2024-04-26 Thread Darryl Thayer via RE-wrenches

Hi Jay I have gotten this type of information directly from Hammond, I
would think from transformer to House line loss should be considered.  From
my Experiance, people go to 400 amp services mostly for circuit count.  I
have measured a few transformers in past but I don't know where data is
now.

On Fri, Apr 26, 2024, 5:54 PM Jay via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hi all.
>
> Anyone know what the tare loss and efficiency is of a 75 kw transformer?
> And it would be run mostly at 1-10kw max.
>
> This one specifically.
> hammond SG3L0075PE
>
> I’m just curious about it. The situation is 240vac grid at the street,
> 600’ to the house 400 amps.
>
>
> Why 400 amps on a house with propane heat, cooking, water heater, dryer
> and no AC.
> I don’t know.
>
> Thanks
> Jay
>
>
>
> ___
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
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>
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> other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
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>
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[RE-wrenches] Large transformer losses

2024-04-26 Thread Jay via RE-wrenches

Hi all. 

Anyone know what the tare loss and efficiency is of a 75 kw transformer?
And it would be run mostly at 1-10kw max. 

This one specifically. 
hammond SG3L0075PE

I’m just curious about it. The situation is 240vac grid at the street, 600’ to 
the house 400 amps. 


Why 400 amps on a house with propane heat, cooking, water heater, dryer and no 
AC. 
I don’t know. 

Thanks
Jay



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[RE-wrenches] Large transformer losses

Re: [RE-wrenches] Large transformer losses

Re: [RE-wrenches] Large transformer losses

Re: [RE-wrenches] Large transformer losses

Re: [RE-wrenches] Large transformer losses

[RE-wrenches] Large transformer losses

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