[TCML] NST quick question

[bartb]

Hello Amir,

The filter attenuates high frequency transients that can cause winding 
damage to the NST. Even in oil these problems can occur within the 
densely packed windings. The oil is good for heat dissipation and corona 
prevention, but excessively high voltages and hv transients will not be 
stopped by the oil from damaging the NST. Filtering is needed as well as 
a properly set gap.

There is no "requirement" for a Terry Filter, but it is certainly a good 
idea to have a filtering circuit with NST's. Given that Terry's filter 
circuit incorporates a safety gap, RC filter, and MOV's, it's a good 
filter circuit for this application.

Cheers,
Bart

Ln2guy42 at aol.com wrote:
> Hi all!
> I have a quick question.
>  
> Is a Terry Filter still required on an unpotted, shunts removed, NST  
> immersed in oil?
>  
> I reckon you should, but can it handle the extra current of the shunt less  
> NST? which is around 200ma
>  
>  
>  
> The original transformer was a 12/60 but after a few months of soaking in  
> kerosene, it finally came out, and I took out around half the shunts.
>  
> Thank you!!
>  
> Amir M.
>
>
>
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