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Line conditioner for "dirty" power

Posted on 2008-09-30
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Customer gets lots of "dirty" power from power company but already has a dual conversion online UPS to protect them. Customer feels that this is not enough and has seen tv shows that have talked about something before the UPS in the electrical room (something about filtering harmonics) that have been placed in large business installations that is protection before it reaches the UPS. (not a generator)
Filtering harmonics may not be the right solution but I would like to start there.

I am hoping to hear from people that are electrical engineers (if possible) or have had extensive electrical work or have seen large installations where the above scenario has been used.

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Question by:SPORTHAWKS
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by:Callandor
ID: 22623809
I think he's talking about EMI power filters: http://www.radiuspower.com/emi_filters.html

An online UPS generates power from its batteries, while recharging them from the wall outlet.  I don't understand why the customer would think that he is getting "dirty" power from the power company when it is being generated by his UPS.  If true, then the UPS is the source of the problem, if it is an online type.  In cases like this, it is best to separate facts from opinion, so I would try to find out if there really is noise in the power line, unless he just wants it installed for peace of mind.
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by:SPORTHAWKS
ID: 22625782
Thanks for responding Callandor.

Forgive me since I am not an electrician but do you place the EMI power filter before the 3 phase UPS? And if so, what needs to go in and out of those connectors on the EMI filter unit?

2) Also I found a Passive Harmonic Filter from Dynaspede:

http://www.dynaspede.com/004_01_002.htm

Would you recommend the EMI filter or the one from the link above?




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Callandor earned 250 total points
ID: 22626488
I'm not an electrician, but since you typically install these for the whole building, it would go before the UPS.  Three-phase power has three wires plus a ground, so those are the four connections.

I haven't installed these, so I can't comment on whether one brand is better than another.  You may want to wait for someone with actual experience to comment on this.
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