Try the PS 4000 Power Sight Power Analyzer (<a href="http://www.powersight.com/" target="_blank">http://www.powersight.com/</a>). You can log current, voltage, waveforms, transients, distortions, frequency, swells and sags, etc. You can get the graph and the data, so you don't have to judge the appearance of the graph. The PS3000 doesn't capture transients or distortions. <div>
<br></div><div>Anyone "working on a short term energy efficiency projects in California" can borrow this tool for free from the PG&E Tool Lending Library (<a href="http://www.pge.com/mybusiness/edusafety/training/pec/toolbox/tll/" target="_blank">http://www.pge.com/mybusiness/edusafety/training/pec/toolbox/tll/</a>). Fine print: <i>The project address is within the service territory of one of California's Investor Owned Utilities (PG&E, Sempra, SCE) which support this and other programs through the Public Goods fund, </i>so this should work for you Peter, unless your customer is in LADWP or another municipal utility.</div>
<div><br></div><div>You can set it up to log over long periods, and/or plug it into a laptop for live readings while you load up the generator, plus save that data for further analysis later. </div><div><br></div><div>-Phil Boutelle</div>
<div><br><br><div class="gmail_quote">On Tue, Jun 5, 2012 at 11:09 AM, William Miller <span dir="ltr"><<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
Peter:<br><br>
Excellent topic. Just two weeks ago I was working on two Xantrex
XW6048 inverters connected to identical Kohler RES15 generators.
One inverter would connect to the generator, one would not. I
looked at the waveform with a very old, very cheap service scope.
The waveforms from both generators looked triangular.<br><br>
I looked at the waveform at an on-grid location and the waveform looked
triangular, but less so. Now I can't trust my scope. I ask
the same question you are: What tool do we use to check power
quality? Can we judge a sine wave by it's appearance?<br><br>
William Miller<br><br>
<br><br>
<br>
At 10:43 AM 6/5/2012, Parrish, Peter wrote:<br>
<blockquote type="cite">Content-Language: en-US<br>
Content-Type: multipart/alternative;<br>
<u></u> <u></u>boundary="_000_C97976CE00E1154DBC70321CCE6BC4B309AF31A6EXCHMBX1StaffCa_"<div><div><br><br>
<font>I would like to follow up on a discussion of under what
conditions an anti-islanding compliant inverter would have problems with
the utility power quality and off grid inverters would have with
generator-derived power quality. I think that Bill Brooks pointed to a
document a while ago about specific transient events, and we all know (or
should know) the +/- 10% VAC and +/- 0.1 Hz requirements. Bill would you
be so kind as to point us there again? <br><br>
What I would like to understand is the following: Is there a power
quality analyzer (e.g. Fluke 430 Series II) out there can asses power
quality and predict compatibility with the various grid-tied and off grid
inverters? <br><br>
As far as off-grid inverters are concerned, what I imagine is a follows:
-- Fire up a generator (e.g. Honda Eu3000iS), load it down with a
reasonable resistive load (e.g. 1,500 kW), and look at VAC, freq,
harmonic distortion, transient events -- and come up with a way to assess
whether or not an off-grid inverter would work with the
generator<br><br>
As far as grid-tied is concerned, monitor utility power and provide the
same answer for grid-tied inverter.<br><br>
- Peter Parrish Peter T. Parrish, Ph.D., Chair Alternative Energy
Department, College of the Canyons Room 700F 17200 Sierra Hwy. Santa
Clarita, CA 91351 <a href="mailto:peter.parrish@canyons.edu" target="_blank">peter.parrish@canyons.edu</a> O: <a href="tel:%28661%29%20362-3888" value="+16613623888" target="_blank">(661) 362-3888</a> C: (323)
839-6108</font></div></div></blockquote></div>
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