I've looked around the web and it's very difficult to get accurate information about what distribution and transmission voltages are used around the world.

So list your country here !

Ireland:
Frequency: 50 Hz +/- 1%

Distribution:
LV 230/400 V +/- 6% (formerly 220/380V)
(PME TN-C-S unless otherwise advised)
MV 10, 20 and 38 kV

Transmission:
HV 110*, 220 and 400kV
(* a small number of large industrial customers are directly connected at 110kV)



[This message has been edited by djk (edited 01-31-2004).]

United Kingdom:
Frequency = 50Hz +/- 1%

LV: 230/400V official (still 240/415V in practical terms)
MV: 11, 33kV (plus some old 6.6kV in a few areas)
HV: 66, 132, 275, 400kV

djk,
New Zealand:
ELV: 12-24-48V
LV:230/400V MEN
HV:3300V,6600V,11kV,22kV,33kV.
EHV:66kV,110kV,220kV
UHV:500kV DC Link

[This message has been edited by Trumpy (edited 01-24-2004).]

Djk,
Cool topic mate, my favourite.
Mind you just trying to identify the actual system you are working with here, takes most of your time.
Oh and we use 50Hz here too!

[This message has been edited by Trumpy (edited 01-24-2004).]

OK. Fair warning… you asked for it. US 60Hz standards are:

120
120/240
208Y/120
240∆/120
480Y/277
600Y/346
4160Y/2400
4800
6900
8320Y/4800
12,000Y/6930
12470Y/7200
13200Y/7620
13800Y/7970
20780Y/12000
22860Y/13200
23000
24940Y/14400
34500Y/19920
46000
69000
115000
138000
161000
230000
345000
500000
765000
1100000

1.1 megavolts! Toast, anyone?

Are those very high voltage ones DC links?

765 kV is AC. Don't know about 1100 kV. The Italians have 1000 kV lines (overhead and underground) and the Russians have some 1150 kV overhead lines.

I know that Eirgrid (Ireland) and the UK national Grid are currently investigating the possibility of a high capacity DC interconnector between Dublin and somewhere in Wales.

No idea what the details are but I suspect it would be larger than the Moyle DC interconnector that links Northern Ireland to Scotland.

It would also be a substantially longer cable.

Interestingly, the Northern Ireland and Republic of Ireland 110kV networks are directly interconnected at points to provide network security at a few places where it made economic sense on both sides of the boarder. They are not regarded as true interconnectors though as power is not traded over them.

[This message has been edited by djk (edited 01-26-2004).]

1100kV is written in ANSI standard C84.1, but I don't think it's used beyond the experimantal stage in US power distribution. 345, 500/525 and 765/735kV are in regular use. The three groups are considered "EHV".

DC Way Out West is typically ±500kV or 1MV between spans. {That makes it easy to visualize the line power/current rating… 1 ampere = 1 megawatt!}





[This message has been edited by Bjarney (edited 01-26-2004).]