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Flexible cable for generator backfeed use? - Page 13

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Posted by Derek Broughton on September 16, 2005, 12:03 pm
 


Ignoramus9118 wrote:


Not fair, ig.  Gail didn't write what you just quoted her as writing.
--
derek

Posted by Steve Spence on September 15, 2005, 8:19 pm
 


Gail Storm wrote:

when

Might pop the breaker on the generator. What the concern is if your
breaker si closed, and a lineman is working on the lines, your generator
is feeding power to the transformer on your pole, and stepping up the
voltage (lowering the amps, as watts is watts). Not likely to do any
damage with the small generators most folks use, but it is a risk.

--
Steve Spence
Dir., Green Trust, http://www.green-trust.org
Contributing Editor, http://www.off-grid.net
http://www.rebelwolf.com/essn.html

Posted by Vaughn Simon on September 16, 2005, 2:52 pm
 



For a lineman to be hurt from a backfeeding generator, four things must
happen simultaniously:

1) Some idiot runs a generator connected to his house wiring with no proper
transfer switch and with his main breaker still closed.  and...
2) Our idiot happens to have an isolated pole transformer that is so lightly
loaded that his generator does not somehow trip.   and...
3) There happens to be a line crew working outside our idiot's house.
and...
4) That line crew is ignoring proper procedure and working in a criminally
negligent manner.

     I think that #1 and #3 are possible, and #2 and #4 are vanishingly
unlikely.  The possibility of all four of the above happening simultaniously
is barely worth our time to discuss...yet we do.

Vaughn




Posted by Steve Spence on September 16, 2005, 2:56 pm
 

Vaughn Simon wrote:

It's enough of a risk, that the powers that be mandated specific
millisecond disconnect rates in grid tie inverters to prevent this from
happening.


--
Steve Spence
Dir., Green Trust, http://www.green-trust.org
Contributing Editor, http://www.off-grid.net
http://www.rebelwolf.com/essn.html

Posted by daestrom on September 16, 2005, 7:05 pm
 



The grid-tie inverter dis-connect timing isn't about this particular issue.
It is there to prevent 'islanding' of a small section of grid and the damage
your inverter would see if the grid power came back on while the inverter is
still 'pumping power'.  Highly likely that it would not be in phase with the
returning power, and the results could be 'spectacular'.  But your inverter
would lose all its 'magic smoke'.

daestrom



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