[BC] HT Transformer

[Jerry Mathis]

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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