Industrial transformers usually hum.
"Audiophile" transformers will be designed for lower flux, more attention to clamping, often inside an enclosure, maybe on rubber pads.
So is this industrial or for-audiophiles?
3-phase 220V is not exotic power. Floating center-tapped power has been around as an "audiophile thing" for over 20 years to my knowledge, but has not caught-on with the majority of audiophiles. (It also opens interesting questions about electrical safety and line-side design assumptions.)
"Audiophile" transformers will be designed for lower flux, more attention to clamping, often inside an enclosure, maybe on rubber pads.
So is this industrial or for-audiophiles?
3-phase 220V is not exotic power. Floating center-tapped power has been around as an "audiophile thing" for over 20 years to my knowledge, but has not caught-on with the majority of audiophiles. (It also opens interesting questions about electrical safety and line-side design assumptions.)
Its possible that the transformer is poorly designed and hence hums. Encapsulating it will not stop the hum.
Your DC blocker may not be removing the residual DC if it is greater than a single diode drop.
Ideally you need someone who can work safely to look at the mains waveform with a scope... make sure you are dealing with AC mains that isn't a mess...
If all else is OK then physically mounting it with a rubber donut shape top and bottom could do the job. That would isolate the mechanical vibration from what it is mounted on.
Your transformer may be poorly impregnated or even not at all.
get a can of Transformer Varnish, put the transformer core and winding (meaning naked, no case of ny kind) inside a suitable Tupperware type container or similar and pour varnish over it until you cover it.
Let it bubble out until all air left and varnish got to the deepest crevices, may take overnight.
Then you pull it by the wires, tie that somewhere and let it drip excess varnish inside the can or container.
Get an air dry type varnish so you don´t contaminate your kitchen oven.
Enjoy the silence.
NOTE: if you can´t find proper transformer varnish where you live, you can use good quality "wood type" varnish, what´s often called "marine varnish" , the plain one which takes at least overnight to dry, stinks for a few days of "fresh paint" and does not *really* harden until after many days ... and which is rock hard after a year.
Inexpensive, can be found locally anywhere and is not a waste of $$$$, you can let excess dripback inside original can and you can use it later around the home.
Only problem is that it´s slooooow drying, while specially formulated transformer type air dries for good in less than an hour ... no big deal.
get a can of Transformer Varnish, put the transformer core and winding (meaning naked, no case of ny kind) inside a suitable Tupperware type container or similar and pour varnish over it until you cover it.
An externally hosted image should be here but it was not working when we last tested it.
Let it bubble out until all air left and varnish got to the deepest crevices, may take overnight.
Then you pull it by the wires, tie that somewhere and let it drip excess varnish inside the can or container.
Get an air dry type varnish so you don´t contaminate your kitchen oven.
Enjoy the silence.
NOTE: if you can´t find proper transformer varnish where you live, you can use good quality "wood type" varnish, what´s often called "marine varnish" , the plain one which takes at least overnight to dry, stinks for a few days of "fresh paint" and does not *really* harden until after many days ... and which is rock hard after a year.
Inexpensive, can be found locally anywhere and is not a waste of $$$$, you can let excess dripback inside original can and you can use it later around the home.
Only problem is that it´s slooooow drying, while specially formulated transformer type air dries for good in less than an hour ... no big deal.
Are you sure your transformer is not overloaded ? , measurement will clear that out .
vibration cant be stopped they can be absorbed at least .
some guys put their isolation transformer in fine sand , and it works pretty well
easy to try
in case the transformer is 3 x 220v , the 3 phase must be well balanced , otherwise it hums .
.
vibration cant be stopped they can be absorbed at least .
some guys put their isolation transformer in fine sand , and it works pretty well
easy to try
in case the transformer is 3 x 220v , the 3 phase must be well balanced , otherwise it hums .
.
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