underground tunnels

jbartos · May 3, 2003

Suggestion: Visit

http://www.southwire.com/tech/pubs/tdu/97/tdu0797.htm

for: "Keep up with conductors at ICC"
and
Underground Power Cables
by S. Y. King, N. A. Halfter
Underground power cables : some aspects of their thermal environment by S. Y. King

alehman · May 4, 2003

Are you looking for info on the design of the tunnel itself or use of power cables within a tunnel? What size tunnel are you considering?

144x · May 5, 2003

I'm looking for the information on the tunnel including needed facilities and the techniques for cabling in the tunnel .dimensins are apprximately 2 by 2.5 meter.

busbar · May 5, 2003

Have you considered posting in the civil engineering forum?

alehman · May 5, 2003

I don't know of any book that deal with this specifically. I would think the main concerns would be temperature, possible corrosive or wet environment, type of cable jacket, and means for supporting the cables.

temperature: you need to know what it is. Utility tunnels with steam pipes can be very hot, which may require derating the cable ampacity.

corrosion: personal experience tells me to stay away from exposed aluminum as it will corrode rapidly in a moist environment. I've seen aluminum cable tray in utility tunnels fall apart within 10 years. Use hot-dipped galvanized steel, stainless or non-metallic materials.

jacket: must be impervious to moisture. Don't use unjacketed C.N. cable or unjacketed CLX.

support: cable tray?

Does this help?

144x · May 6, 2003

ofcourse this helps but I need a little more detailed information and some photos and techniques for cabling too.

alehman · May 6, 2003

Here are some photos of typical looking utiltiy tunnels-

http://images.google.com/imgres?imgurl=

http://www.underground-ny.com/ny_st...nel&svnum=10&hl=en&lr=&ie=UTF-8&oe=UTF-8&sa=G

http://images.google.com/imgres?imgurl=

http://www.ets.uidaho.edu/energy/im...=20&svnum=10&hl=en&lr=&ie=UTF-8&oe=UTF-8&sa=N

http://images.google.com/imgres?imgurl=

http://www.infiltration.org/images/...=20&svnum=10&hl=en&lr=&ie=UTF-8&oe=UTF-8&sa=N

http://images.google.com/imgres?imgurl=

http://www.drwren.com/photo_album/G...=20&svnum=10&hl=en&lr=&ie=UTF-8&oe=UTF-8&sa=N

http://www.actionsquad.org/Labyrinth/tcrt02.htm

http://pplant.sdstate.edu/steam.htm

Some general technical info on medium voltage cable application-

http://www.okonite.com/engineering/index.html

See this link for temperature derating factors from one cable manufacturer. Consult your manufacturer for exact numbers-

http://www.okonite.com/engineering/ampacity-correction-factors.html

For cable tray and other support systems-

http://www.b-line.com/product/index.asp

http://www.b-line.com/product/PDFLibrary/CableTray/Metallic/index.htm

Some articles found at IEEE-
Gregory, B., Choices and considerations for the selection of power cables in tunnel installations. Cables in Tunnels (Ref. No. 2000/070), IEE Seminar , 2000 Page(s): 8/1 -8/9

Schroth, R.G.; Obst, D., Long distance tunnels for the installation of 400 kV XLPE cables. Cables in Tunnels (Ref. No. 2000/070), IEE Seminar , 2000 Page(s): 4/1 -4/4

Mendez, J.M., Sr.; Monteys, J., Design of power and communication cable installations to minimise interference in tunnels. Cables in Tunnels (Ref. No. 2000/070), IEE Seminar , 2000 Page(s): 6/1 -6/6

Anders, G.J., Rating of cables on riser poles, in trays, in tunnels and shafts-a review. Power Delivery, IEEE Transactions on, Volume: 11 Issue: 1 , Jan 1996 Page(s): 3 -11

Ohata, K.; Sakurai, S.; Ichiyanagi, N.; Shibata, K.; Inoue, T., Transient temperature rise of tunnel for power cables
Power Delivery, IEEE Transactions on , Volume: 5 Issue: 2, Apr 1990 Page(s): 745 -752