[Christopher Witmer]

Clicking on the thumbnail image will give you a larger view.

The above image represents a really high quality 3-phase EMI filter that I recently came upon. The thing weighs 10 lbs, and is rated at 250VAC/60A (three phase). The one-minute test voltage is 2000V. I can't see inside the case since it is completely sealed with solder, but I'm told it uses mica capacitors and that the parts inside are all shielded from each other . . . designed not only to keep noise out, but also to avoid generating any self-noise.

If possible I'd like to use this; of course my requirements are strictly single-phase and my maximum current draw would alway be less than 20A, even at peaks.

Can anyone give me suggestions as to how to wire this for best results? Is an independent earth wire a good idea? Any feedback or comments would be greatly appreciated!

[Occam]

Sounds like it would make an excellent paperweight.

Not knowing the details (nor do I wish to), I'd assume that use at far below its intended load (jury rigged for single phase instead of 3 phase, by using 2 of the 3 input/outputs), it might well exhibit a high 'Q' peak, potentially exacerbating noise rather than attenuating it at its pole frequency.

[Builder Brad]

why not have a go and actually build one yourself - this has got to be one of the easiest DIY items to build, and you get the option of choosing the values of the components to match your application. here is a link to a web site that describes the project in more detail: I built a couple of these and have been very happy with the results - more recently I have built 4 x Felicias and found that they performed even better, subject to their power limitations.


http://www.triode-systems.com/modules/wfsection/article.php?articleid=3

I really could not imagine having some industrial power supply filter box in my living room!