Feeding solar power back into municipal grid: Issues and finger-pointing - Page 6

 On 4/14/2011 10:33 AM, harry wrote:

Use of "per-unit" values for voltage, current, impedance, ... is common
in the electric power field. It makes calculations easier, particularly
as the system gets more extensive. One of the "per-unit" values is "%
impedance".

A utility transformer is likely to be rated in "% impedance".

Daestrom has written about this. Looks like mII (or whoever) is familiar
with it. That leaves you. If you knew as much as you think you know you
would be familiar with % impedance.

You really need to go for some instruction. These things can't be worked
out by lying on your bed and thinking about it.

--
bud--

 
   <  super snips  >



The utility needs to plan & build for all the peak-demand periods.
If every single home in a southern Canadian town installed 5-10
kw solar  -  the utility would still need to plan & design & build  -
as if those panels didn't exist.
 ..  summer air conditioner peaks would be aces  !
       Air quality  -  big plus  !
 ..  but the distribution system would still need to be built to
 supply the peak at  5:45 pm  December 20  -
 ..  solar output = zero.  grid demand = near max.
   John T.

 On 4/12/2011 11:59 AM, harry wrote:

If you are talking about normal load ratings - what a useful revelation.
I am sure no one had any idea...


There is a limit on the normal current for a transformer?
I had no idea....

But heating is not a limit on fault current (which my post was almost
entirely about).


Earth is not calculated because it is such a poor conductor. It may be
necessary in some of the screwier UK electrical systems with an RCD main.


With minimal reading ability it is obvious that daestrom, mII (or
whoever) and I talked about the fault current ratings of circuit
breakers or fuses. Or did you think that houses have 10,000A services?


I worked them out 40 years ago then worked with them the last 40 years.

You really should learn to read and think. Maybe when cows fly....

--
bud--

 

daestrom wrote:


Please be informed that the Josepi clown has been forging my username
for a few weeks now. His provider is doing nothing to stop the forgeries.

Check the headers when in doubt. It's times like these I wonder about
the maturity levels of some, no doubt very ill, people.


mike

 

daestrom wrote:


Please be informed that the Josepi clown has been forging my username
for a few weeks now. His provider is doing nothing to stop the forgeries.

Check the headers when in doubt. It's times like these I wonder about
the maturity levels of some, no doubt very ill, people.


mike