I need to give a group of California educators the simplified explanation of
inverter anti-islanding. I know the full details are quite complicated and
have evolved a bit over the past few years, but would the following be an
acceptable short explanation?
*** Please contact me off-list with
If you wouldn't mind Peter, I'd like to see this discussion stay on the list.
I'd be interested to learn more about the actual anti-islanding features of
inverters.
What you've described seems to just cover the voltage and frequency windows
that the inverter will grid tie to.
I was always under
Hi gang. If you have any comments or concerns about this email, please contact
me off list.
I asked Peter to request his responses off-list, since this is more of an
education project aimed at the masses than a wrenching project.
Keeping the list pertinent to pro installers is my number 1
Kent,
I'm not a geezer yet, but thanks to my dad I do have a copy of the 1987 NEC.
690-5 (Ground Fault Detection and Interruption) was added in the 1990 NEC.
There is no 690-5 or mention of ground fault detection/interruption in the
1987 NEC.
In the 1990 NEC, section 690-5 is very small compared
Hans,
John Wiles described the evolution of this standard for a Home Power article
that we referenced later in a SolarPro on PV System Ground Faults:
http://solarprofessional.com/article/?file=SP2_5_pg60_Mync
³As described by John Wiles, program manager for the Institute for the
Energy and the
David,
Thanks for the interesting history on GFPDs. My copy of the 1987 NEC does
not have 690-5, and it's not missing any pages. Either my code book is an
incomplete printing or perhaps John Wiles was referring to a 1987 proposal
that didn't make it into the code until the 1990 NEC.
Regards,
Thanks, David. I've been looking for a 1987 NEC because of this
reference and others where John Wiles has referred to it.
David Brearley wrote:
Re: [RE-wrenches] 1987 NEC
Hans,
John Wiles described the evolution of this standard for a Home Power
article that we referenced later in a
Thanks, Hans.
The part about shorting the array was abandoned, I'm not sure but it
may be have been removed for the 1993 code.
It's item two on this list that I've been trying to backtrack to. It is
pretty much the same as in the current code: "open the grounded
conductor". It is also not
We had an early 90s system with a DCGFP(complete with 4/0 GEC:)). A ground
fault on a DC load circuit caused the GFP to lift the ground, shut the array
off, but the short was still being fed by the battery and wouldn't trip the DC
breaker, since negative was disconnected from ground. I thought
Presumably the latteradded as part of the cycle of revisions initiated in
1987.
On 7/19/11 3:29 PM, Hans Frederickson h...@fredelectric.com wrote:
David,
Thanks for the interesting history on GFPDs. My copy of the 1987 NEC does not
have 690-5, and it's not missing any pages. Either my code
On 7/19/2011 2:34 PM, David Brearley wrote:
Presumably the latter---added as part of the cycle of revisions
initiated in 1987.
The array shorting requirement must have gone away near 1993 or 1994 as
I designed an opening and shorting of the array style GFPD version in
1994 while at Trace
Anyone have the manual or spec sheet in an electronic format that they could
send me, please?
Thanks,
marco
provision_highres_solar_logo2 with C-26351
Marco Mangelsdorf, President
69 Railroad Avenue, A-7
Hilo, Hawai'i 96720
(808) 969-3281, 934-7462 facsimile
I'm s bummed out that SMA has removed their handy and easy to use string
sizing tool from their website and replaced it with a cumbersome monster of
a design program. (Yes, at my age I do struggle with having to learn yet
another bloomin' program.)
Does anyone know if there's some magic
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