----- Original Message -----
From: "Kittel, Stephen W (ETSA)" <[EMAIL PROTECTED]>
-----Original Message-----
From: Ben Jones
Unless system stability is an issue (which it probably isn't with a
generator that can glaze pistons).
If system stability is an issue then running alternators with slightly
lagging power factor is preferred (about 0.9 is what they are usually
designed for).
http://www.wsws.org/articles/2001/jan2001/ind-j09.shtml
In 2001 there was a massive blackout in India (some 10's of Gigawatts
from memory, ie Australian national grid size) because a too many
generators were running at unity power factor. After the first one
tripped, the others followed in a chain reaction, not because the load
(in MW) was too great (at least initially) but because the system
couldn't support the reactive power (ie PF) requirements quickly enough.
I was running a station sum watt ( sorry for the pun .... yeah i know no
humor ! ) smaller at only a 15 meg setup, but power factor changes was no
great problem the simation computers did the maths for me and changed thinks
to compensate... but only to a extent then load banks had to be dropped on
the buss to compensate.
bulb or elements ), this does 2 things it makes it easier for
the simation software and computers running the generators
and alternators to move the fields around leading or lagging
to bring up the powerfactor back to the desired point , and
it also actually runs the generators in a more efficent way
getting the most spark for your liter burnt in fuel, avoiding
hot spots and glasing the piston sleeves.
I in hinesight prob should have not included the bit about Glazing pistons,
thinking about it now... we on the mine site had a requirement to have a
spinning reserve and 3 extra generators just ticking over idle ready (
introducing the glazing problem) for a demand alarm which the dweeb
operators are ment to trip 10 mins before dropping the ball and sag mills
online, but grunt knuckle dragging miners would not trip the demand alarm
and drop both mills on line before i could get the idle gensets up to speed
sync'd and on the buss and pull over the station, mine and town into
complete darkness, only because the current protection on the station was 10
times more accurate than there old Rayroll Gear
And soon (ill bet my right nut on it ) power providers will
force a move to digital power meters on you house,
Don't know where you've been the last few years Ben,
Never left the sparkie job yet .
but that's not
news. In South Australia (and similar for the other states, I guess) the
move to digital meters for _many_ reasons (both technical and
idealogical) has been in place since the mid/late 90's at least.
Sorry my comments were not clear, yes new houses in WA are ( and have been
for a while) being fitted with digital meters,
My unclear suggestion was they will remove all existing " Disk spinners "
out if installations and replace with digital meters
Also I don't think there have been any meter manufacturers making
mechanical meters for the last few years.
I "think" email still produce them as a side line but are unsure ??
Regards
SWK
Ben
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