![Quote](images/misc/quote_icon.png)
Originally Posted by
infantry11b
...
but we know what happens if you shoot electricity into water and to anything in the water - so tell us what happens when one of those breaks and you starting releasing MILLIONS of watts of power at whatever amp's into that water? how far will the kill zone be? does that mean that no people can be in the water for how many miles from the cable or turbine?
...
I'm not an expert in underwater cabling but from the small amount I do know;1; they monitor all 'leakage" of electricity into the water, which should be zero at all times, and 2; in the event of a catastrophic cable failure with a large energy dump they always protect the hardware with circuit breakers so all power would be turned off within a fraction of a second.
Not necessarily to protect the poor fish, but to protect millions of dollars worth of equipment. ![Wink](images/smilies/wink.png)
Don't think these undersea cables are like anything you have seen, they are very sophisticated and among the most reliable of cables ever devised.
Sorry for the long list, but here is a snip from Wiki about undersea power cables;
Code:
Alternating current cables
Alternating-current (AC) submarine cable systems for transmitting lower amounts of three phase electric power can be constructed with three-core cables in which all three insulated conductors are placed into a single underwater cable. Most offshore-to-shore wind-farm cables are constructed this way.
For larger amounts of transmitted power, the AC systems are composed of three separate single-core underwater cables, each containing just one insulated conductor and carrying one phase of the three-phase electric current. A fourth identical cable is often added in parallel with the other three, simply as a spare in case one of the three primary cables is damaged and needs to be replaced. This damage can happen, for example, from a ship's anchor carelessly dropped onto it. The fourth cable can substitute for any one of the other three, given the proper (and complicated) electrical switching system.
Mainland British Columbia to Nelson Island to Texada Island to Vancouver Island, the destination of the power. This is a high-capacity 500 kilovolt (kV) three-phase system.
Mainland Sweden to Bornholm Island, Denmark (110 kilovolts, but some sources state 72 kV).
Under the Strait of Messina, connecting southern tip of the mainland of Italy with the large island of Sicily (380 kV). This submarine cable replaced an earlier, and very long overhead line crossing (the "Pylons of Messina")
Negros Island to Panay Island, in the Philippines (138 kV)
[edit]
Direct current cables
Baltic-Cable - between Germany and Sweden beneath the Baltic Sea
Basslink - between the mainland State of Victoria and the island of Tasmania, Australia, 500 kilovolts (kV), with a length of 290 kilometers beneath the Bass Strait[citation needed]
BritNed - between the Netherlands and Great Britain beneath the North Sea
Cross Sound Cable - between Long Island, New York, and the State of Connecticut beneath Long Island Sound[citation needed]
Estlink - between northern Estonia and southern Finland beneath the Gulf of Finland
Fenno-Skan - between Sweden and Finland beneath the Baltic Sea
HVDC Cross-Channel - very high power cable between the French mainland and the island of Great Britain beneath the English Channel
HVDC Gotland - the first HVDC submarine power cable (non-experimental) - between the Swedish mainland and the Swedish island of Gotland beneath the Baltic Sea
HVDC Inter-Island - between the power-rich South Island (much hydroelectric power) of New Zealand and the more-populous North Island beneath the Cook Strait
HVDC Italy-Corsica-Sardinia (SACOI) - between the Italian mainland, the Italian island of Sardinia, and its neighboring French island of Corsica beneath the Mediterranean Sea[citation needed]
HVDC Italy-Greece - between Italy and Greece beneath the Adriatic Sea[citation needed]
HVDC Leyte - Luzon - between Leyte Island and Luzon in the Philippines, beneath the Pacific Ocean[citation needed]
HVDC Moyle - connecting Scotland with Northern Ireland within the United Kingdom, and thence to the Republic of Ireland, beneath the Irish Sea
HVDC Vancouver Island - between Vancouver Island and the mainland of the Province of British Columbia, beneath the Strait of Juan de Fuca
Kii Channel HVDC system - now (2010) the world's highest-capacity long-distance submarine power cable (rated at 1400 megawatts). This power cable connects the large islands of Honshu and Shikoku beneath the Kii Channel in the Japanese Home Islands
Kontek - between Germany and Denmark beneath the Baltic Sea
Konti-Skan - between Sweden and Denmark beneath the Baltic Sea[citation needed]
Neptune Cable - between the State of New Jersey and Long Island, New York - 64 miles beneath the Atlantic Ocean[2]
Swepol - between Poland and Sweden beneath the Baltic Sea
[edit]
Longest
NorNed (between Eemshaven, Netherlands and Feda, Norway), HVDC, 700 MW, 580 km (360 mi)[4]
[edit]
Proposed submarine power cables
Champlain Hudson Power Express, 335-mile line. The Transmission Developers Company of Toronto, Ontario, is proposing "to use the [ Hudson River ] for the most ambitious underwater transmission project yet. Beginning south of Montreal, a 335-mile line would run along the bottom of Lake Champlain, [and then] down the bed of the Hudson all the way to New York City."[3]
Power Bridge, Hawaii[1]
Power Bridge, State of Maine[1]
Puerto Rico to the Virgin Islands[4]
400 kV HVDC India to Sri Lanka[5]
Atlantic Wind Connection between Delaware and New Jersey, potentially between Virginia and New York[6]
100 megawatts 165 km Canadian province of Newfoundland and Labrador and province of Nova Scotia[7]
200 megawatts 95 km Magħtab (Malta) and Marina the Ragusa (Sicily)[8]