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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: How to Spec a Dedicated AC Line? posted by tomservo on April 2, 2007 at 07:16:19:
Hi.Isolation transformer ia not a cure-all.
A PROPERLY design-built isolation transformer can effectively stop the harmful surges riding the powerlines from damaging the sensitive electronic equipment load.
We need high temp multi-varnished magnet wires, high dielectric interwinding insulation sheet instead of cheapie Kraft papers, etc etc to prevent surges arc-overs.
Another very important feature is the interwinding electrostsatic shielding to drain away common-mode lightning surges.
But unfortunately many isolation powerline transformers commonly cheat away by using copper or even aluminum foil wraps. Why can the huge lightning surge currents be drained away in split seconds via such skinny so called shield ??
Properly built isolation transformers should use heavy gauge copper flat ribbon bars as shield to drain away the hugh current surges effectively.
Another neglected factor is effective loading of the isolation transformer in case of HF noise surge across common-mode lines (live/neutral & ground). Without effective loading, the transformer windings ring bigtime at their resonance frquencies & boost up the incoming noise peaks instead of isolating them !!!
Therefore it is imperial to have effective LC powerline RF noise filter DOWNSTREAM of the transformer to damp down the resonance spikes.
Again not all powerline filters are built equal to do the job.
This is another story to tell.c-J
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Follow Ups
- How much we know about isolation transformers ? - cheap-Jack 09:31:57 04/04/07 (0)
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