Re: [TCML] Isolating Transformer

[Michael Gray <graymp89@xxxxxxxxx>]

Does it matter if I put my line filter in before or after the isolation
transformer?


On 13 April 2013 14:21, Michael Gray <graymp89@xxxxxxxxx> wrote:

> Excellent. Nice to have found a use for it finally, assuming it works...
> haven't tried it yet!
>
> What's the primary reason for using them, generally? Safety? Or
> RFI/surge suppression? Or both...
>
> On that note, how effective are they at suppressing surges, transients
> etc.? I don't quite understand how voltage surges would be dampened inside
> the isolation transformer. What's actually limiting the output voltage?
>
>
>
>
> On 12 April 2013 17:50, dave pierson <dave_p@xxxxxxxxxxx> wrote:
>
>>
>>
>> > Brian, what do you do with the output earthing? Do you use MOV's or
>> > other filters?
>> > I have a 1kW isolating transformer. The only time I have used it live
>> > was for a briefcase coil (1/2 low power NST for 3 inch sparks).
>> > Interfered with the PA some distance away big time. I used a
>> > counterpoise plus mains earth.
>>
>>     Was the interference present with the isolation transformer?
>>
>>     Isolation transformers come in (at least) two types.
>>     The usual/simple type is just a one/one transformer,
>>     two coils and core.  This provides isolation for DC
>>     and LF AC, however stray capacity between windings/core
>>     can couple RF.
>>
>>     A more elaborate type includes a 'screen' (internal
>>     Faraday Cage), which reduces the RF coupling.  Sometimes,
>>     if i recall, referred to as an 'instrumentation
>>     transformer'?
>>
>>      best
>>       dwp
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>
>
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