[BC] HT Transformer

[gRAdy Moates]

Me, too.  I'm always ready to learn something new. . .

Grady

----- Original Message ----- 
From: "Jerry Mathis" <thebeaver32 at hotmail.com>
To: <broadcast at radiolists.net>
Sent: Tuesday, May 03, 2005 11:09 AM
Subject: RE: [BC] HT Transformer


> Whoa. In over 25 years of Broadcast Engineering experience, I've never 
> heard of this. (Not that I'm saying I've heard everything, mind you.)
>
> First of all, why would this type of testing and conditioning not be done 
> at the FACTORY?
>
> What is involved in this "conditioning"? And how many radio stations have 
> the equipment to "properly test" the insulation?
>
> Would you care to share your knowledge on this subject? I for one would 
> like to know more.
>
>
>
> Jerry Mathis
> Clear Channel Radio, Tupelo & Meridian MS
>
>
>
>
>>From: <clive at citiria.com>
>>Reply-To: Broadcast Radio Mailing List <broadcast at radiolists.net>
>>To: broadcast at radiolists.net
>>Subject: [BC] HT Transformer
>>Date: Tue, 03 May 2005 05:54:44
>>
>>< am making this inquiry on behalf of a friend in another market. He has a
>><BE FM35T with 3 phase closed-delta power service. He has surge 
>>protection,
>><but I don't know the particulars. The TX was new in March 2000. In March
>><2004, the plate transformer shorted (not sure whether primary or 
>>secondary).
>><No other problems. A few days ago, the replacement plate transformer
>><developed shorted turns (output voltage low and heating). There appear to
>><be no other problems upstream or downstream of the plate transformer. The
>><brand of the transformer appears to be "SNC". I am not familiar with that
>><brand.
>>
>>Assuming this is (very likely) an open-frame type and not oil-immersed, 
>>the
>>failure of the replacement is almost certainly due to the engineer not 
>>having
>>sufficient training and experience.
>>Open-frame HT transformers MUST be conditioned and properly insulation 
>>tested
>>before being put into service. Usually takes 2 - 4 days. Otherwise you can 
>>expect
>>early failure in exactly the way you described.
>>Clive Warner.
>>
>>
>>
>>
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>
>
>
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