UPS Power and Raw Power

RAW means uncooked, in the original state. With warts, pimples, spikes, interruptions etc.

Raw means straight from the mains, that is from the power feed as if the UPS weren't there.

'Raw' here means unfiltered, unisolated, that there's nothing between the power source and the load.

DZ

To add to the previous post, the UPS's I've worked with can normally work in three states. Firstly where the UPS just filters the RAW mains supply, to give you a conditioned mains supply (not RAW). Secondly when the RAW mains fails, the UPS takes over and supplies temporary conditioned mains from it's onboard batteries. Thirdly when the UPS itself encounters a faulty condition, where it can no longer supply condition mains, it can switch the RAW mains supply on (effectively bypassing the UPS). So that you do not loose supply to your process/equipment (last resort). Mean while the UPS should be giving you an alarm condition/output, so that you can rectify the fault and, get back to conditioned mains.

In addition to the prior posts- RAW power is potentially inconsistent power- it can be interrupted either at the point of generation or any where in the distribution grid- including inside the using facility.

Conversely, in addition to being "clean" of spikes or harmonics, UPS power is there (at least for a while) if and when the RAW power is not available without any disruption in operation. UPS will buy time to get a back-up generator operating, or to facilitate an orderly shut-down of critical electronic equipment without damage or loss or data.

RAW power means unconditioned power that mean you have no control on it may:

Go, fluctuate, rise or fall, no backup

The UPS is actually a device which corrects all or some of the conditions for you.

It is a CONDITIONED POWER. Some other POWER CONDITIONERs are:

Filtered; Regulated power supplies etc etc

One other add-on issue-

As "good" as a UPS operation is, there are costs-

First, there is the raw cost of the UPS system installation.

Second, because UPS transforms AC current into DC and then back to AC, there are transformation losses of anywhere from 7% to 15%, which is a hidden energy usage and cost number.

Third- as noted in an earlier post- UPS systems are electronics packages, and have their own risks of failure (they actually post a Mean Time Between Failure number) so most UPS systems for critical installations are actually "parallel-redundant" systems. That means you buy two UPS systems that are designed to work together with 50% loading each and, WHEN one fails, the other system picks up the lost load immediately with no disruption in operations. That also means that you pay twice as mush as you might have needed to for the "safety".

NET EFFECT- UPS is definitely NOT cheap. Good and likely usefull, yes- but expensive at the start and through its life.

Regards.

The Redundat UPS systems are also backedup by a Generator AND that all is worth the saving of systems & Processing units.

It depends;

For an individual : Properly Shutdown of PC

For small industry: Gain time to start & connect Generator.

For a Cartels: Major Redundant units + 3/ 4 Large Generators. And a band of Maintenance Staff & Stores. All this pays off

Well said and so true.

Dear Mr. Dineshpandit80,

The A.C Power from UPS - WAVE FORM will not be EXACT SINE WAVE and will be near to SINE WAVE as it gets distorted while converting DC to AC POWER.

The other power is clear SINE WAVE FORM, which will follow the Equation e = Emax.x Sin Theta

DHAYANANDHAN.S