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Joined: Dec 2002
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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).]
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Joined: Aug 2001
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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
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Joined: Jul 2002
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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).]
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Joined: Jul 2002
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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).]
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Joined: Apr 2002
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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
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Joined: Aug 2001
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1.1 megavolts! Toast, anyone?
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Joined: Dec 2002
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Are those very high voltage ones DC links?
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Joined: Sep 2002
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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.
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Joined: Dec 2002
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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).]
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Joined: Apr 2002
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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).]
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Tom
Shinnston, WV USA
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