[TowerTalk] OT: Generators and UPS's

[Jim Lux]

At 01:59 PM 8/25/2006, John Wagner wrote:
>  A Ferroresonant type of line isolator will in-fact take a rather poor sine
>wave and make it proper.
>
>Topaz, Sola, Delta Emerson used to make them. They are not very efficient
>and don't like loads as they become more inductive and less resistive. SO
>they are not for every application. If they are loaded above 60%, they will
>keep up the sine wave for better than two cycles before they
>decay..sometimes, that's all you need for a 16ms UPS transfer switch to
>engage.
>
>We have really large diesel powered gen sets here and lots of individual
>UPS's around without the problems noted when on gen power.


I suspect the problem is not the UPS, but the non-UPS loads that happen to 
be on the genset.. Flourescent lights, big switching power supplies, 
induction furnaces, arc welders, diathermy machines, tesla coils, 
etc.  Anything that's a "nonlinear" load.


>Keep the list informed if you get any answers from the UPS folks..
>
>John W8JJW