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Old 17th January 2007, 05:47 PM   #11
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Duo,

Yep. I caught it. Are you good in QRZ?

Andrew, This might not be the most sophistocated method, but place a lightbulb between each phase of the add-on unit, and the line(s) of the existing microgrid. Start 'er up, and adjust engine speed until the (three) lightbulbs go out, or nearly so. THen throw the switch, and the aforementioned self-synchronizing will take place.

Steve
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Old 17th January 2007, 05:51 PM   #12
moamps is offline moamps  Croatia
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Yup, old-school stuff.
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Old 17th January 2007, 05:52 PM   #13
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Amazing the things you can learn here!
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Old 17th January 2007, 10:28 PM   #14
Duo is offline Duo  Canada
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N-Channel: I haven't operated my station in ages. Can't even remember the Q codes but upon looking up QRZ I'm not sure exactly what you mean as in "I'm good at it?"
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Old 18th January 2007, 04:40 AM   #15
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go to www.QRZ.com and type in your call sign, VA3MSN, in the space at the top of the page and see what happens................

"I'm good in it" means: Is your info in qrz good, or outdated? I can't believe they actually want $ to update their database, especially since I never requested my info be put in there. I guess they just go to the FCC and see who has a new license and automatically put them in there. As a result, my info is old, and I need to update the pic. UGH!
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Old 18th January 2007, 09:03 AM   #16
Duo is offline Duo  Canada
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My callsign is VA7MON, look at it again.

My info on QRZ is correct though.
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Old 18th January 2007, 01:48 PM   #17
Stocker is offline Stocker  United States
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Quote:
Originally posted by pinkmouse
Amazing the things you can learn here!

Times 2. Thanks guys for sharing.


...wow.
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Old 18th January 2007, 02:40 PM   #18
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The light bulb idea is a good idea, and has been done for years. Highly recommend taking each generator signal through an isolation transformer before feeding the light bulb, however. Doesn't have to be big. Once you verify phase sequence, you only need to synch on one phase, not all three.

With regards to keeping generators in synch, it's not quite that simple.

The typical cogeneration site synchronizes their generator to the utility by controlling the speed of an electronic governor. The engine's mechanical speed controls the frequency of output, so you need (or should) have some means of controlling the speed prior to synchronizing. Once this is done, and the breaker closes, the generator's synchronous speed is controlled by the utility frequency, because it is impossible for them to operate at different speeds (without a fault condition). The utility is the controlling factor, because it is so much larger than the piddly generator.

If you are trying to parallel two generators, this condition does not exist, since you are no longer paralleling to an infinite bus. You need to have a master/slave system going on, where one generator controls the synchronous speed. Without it, the gens will oscillate. Do an internet search on DROOP and ISOCHRONOUS.

Further, once a generator is paralleled to the utility (or another generator), you need to control kW output by controlling the fuel input to the engine. If this control is not correct, you will either overload the little gen, or turn your generator into a motor. Most voltage regulators on stand alone generators are incapable of paralleling, as they only look at output voltage.

There is not some simple answer like "yeah, it will just work". You need to know exactly what equipment you have to work with, and ensure you are set up to parallel.
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Old 18th January 2007, 02:55 PM   #19
SY is offline SY  United States
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Steve, I fixed your link.

ex-WA3KHZ
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Old 19th January 2007, 05:14 PM   #20
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Quote:
Originally posted by Duo
My callsign is VA7MON, look at it again.

My info on QRZ is correct though.
See how rusty my morse is????


Quote:
Originally posted by SY
Steve, I fixed your link.

ex-WA3KHZ
Thanks, SY.
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