+500kV installed underground and indoors
+500kV installed underground and indoors
(OP)
Anyone have expwrince with installing +500kV lines underground and the pros and cons? Is it something that is typcially done?
Also, can the gear that accomodates the 500kv lines be installed indoors?
Thanks.
Also, can the gear that accomodates the 500kv lines be installed indoors?
Thanks.






RE: +500kV installed underground and indoors
RE: +500kV installed underground and indoors
Boys get a rope.
Keith Cress
kcress - http://www.flaminsystems.com
RE: +500kV installed underground and indoors
HV underground cables and indoor switchgear is common in Japan where real estate is at a premium.
We saw one installation that used SF6 bus to carry the 500 kV lines into the congested substation from the overhead line termination point on the outskirts of the station.
RE: +500kV installed underground and indoors
RE: +500kV installed underground and indoors
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Check out page 2 for a discussion of Solid Dielectric (Cross-Linked Polyethylene or XLPE), Gas Insulated Transmission Line (GIL), and Self-Contained Fluid Filled (SCFF) for use at 500 kV AC.
http://www
RE: +500kV installed underground and indoors
RE: +500kV installed underground and indoors
Lady Bird Johnson, wife of then US President Lyndon B. Johnson, visited the site during early construction and saw the mock-up model with transmission lines across the face of the dam. She commented that the wires spoiled a beautiful view of the spill way and couldn't something else be done to beautify this American landmark. HV oil-filled cables through the interior dam access tunnels was the answer.
The big engineering challenge was the difference in elevation between the step-up transformers at the base of the third power house and the new 500 kV yard at the top of the bluff overlooking the dam. I'm guessing it is > 250 meters elevation difference. That height put excessive hydraulic pressure on the bushings at the transformer end and required some interesting cooling system designs.
One side benefit, the dam spillway now is the viewing screen for a spectacular laser light show every summer evening. It is ironic, that with the third powerhouse the spectacular rush of water over the spillway is no longer present except during fish water spills and a minimal trickle for nightly shows.
(Information is from lectures by Dr. Eugene Greenfield, who consulted on the cable design.)
RE: +500kV installed underground and indoors
I guess it's a little like wondering about the pros and cons of flying a helicopter to work and back versus driving a car.
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: +500kV installed underground and indoors
Less clearing and Access Track Management Required.
No arial surveys required.
RE: +500kV installed underground and indoors
At the end of the day the original question still gets answered as yes you can do 500 kV cables, they can be installed indoors, the pro isn't really definable, and the con is that 500 kV cables cost a bunch of money...