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Re: [Amps] Transformer Calcs

To: "Dr. David Kirkby" <david.kirkby@onetel.net>, "'AMPS'" <amps@contesting.com>
Subject: Re: [Amps] Transformer Calcs
From: "Carl" <km1h@jeremy.mv.com>
Date: Thu, 10 Jun 2010 15:09:27 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>

> On 06/10/10 06:04 PM, Bill, W6WRT wrote:
>> ORIGINAL MESSAGE:
>>
>> On Wed, 9 Jun 2010 16:22:11 +0200, Andre Goldschagg
>> <totiranger@gmail.com>  wrote:
>>
>>> Is there a standard formula to use to calculate the KVA rating of a
>>> transformer?
>>
>> REPLY:
>>
>> This may sound like I'm joking, but I'm not:  When running
>> continuously, if the transformer runs too hot to touch, it is
>> overloaded. Heat is the enemy of the insulation and will deteriorate
>> it over time, leading to failure.
>>
>> 73, Bill W6WRT
>
> Personally I would have thought just because a transformer is not too hot 
> to
> touch, it would not be safe to assume it is ok. I've run many transformers 
> up to
> their maximum ratings and they are nowhere near being too hot to touch.
>
> The perception of too hot will also change with person. I recall once 
> finding a
> radiator too hot to touch, but someone else could hold their hand on it
> continuously.
>
> Dave

I wouldnt want to rest my hand on any transformer running at its safe 
maximum using a H rated design.

Carl
KM1H 

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