Attendance: The Group met on Tuesday , May 14 at 3:30 pm with the following 51 individuals attending this meeting.
Vic Antoniello Power Delivery Consultants
Pierre Argaut Silec Cable
Ray Awad Hydro Quebec
Gordon Baker General Cable
Glen Bertini Novinium
Vern Buchholz Consultant
Kyoo Sung Byun LS Cable America
Dave Campilii National Grid
Luanne Cantrell Polymer Group Inc
David Cavassa PGI - Geca - Tapes
Sudhakar Cherukupalli B C Hydro
Chris Conway Sensornet
Matthew Cox Centerpoint Energy
John Fisher Dominion Virginia Power
Toshi Furhashi Decagon Devices
Bryan Glass Greye Glass Equipment
Todd Goyette National Grid
Jason Hoskins Ulteig Engineers
Paul Jakob Progress Energy
Roy Jazowski Ocean Design Inc
Allen MacPhail Cabletricity
Shoji Mashio Sumitomo electric
Peter McEleney National Grid
Harry Orton OCEI
Jim Pachot Poseidon Engineering
J. H. Park Taihan Electric USA
Neal Parker Puget Sound Energy
Depak Parmar Geotherm
Geeta Parmar Geotherm
Nimesh Patel Geotherm
Jerry Ruschkofsu SCE&G
Henry Soleski Kerite
Joon Ho Song LS Cable America
Kim Kwang Soo LS Cable America
Wes Spencer Power Engineers
Hon Suen B C Hydro
Pete Tirinzoni Northeast Utilities
Mark Todesco TTS
Phil Vinal ExxonMobil
Martin VonHerrmann Von Corporation
Jay Williams PDC
Jack Wilson W. A. Chester
Marc Jeroense ABB
Don Koonce Dominion
Thomas Kvarts Energinet.dk
Stephen LaCasse Ulteig Engineers
Frederic Lesur RTE
Jy Woo Taihan Electric USA
Kim Young Woong LS Cable America
Ernesto Zaccone Prysmian
Joe Zimnoch Consultant
Submarine Cable Guide
The guide will expire at the end of this year. The unanimous decision of those present was to reaffirm the guide.
Prior to the next meeting, the existing guide will be sent out for review to the discussion group. At the next meeting a discussion will be held to determine if the guide should be revised. If so, a working group will be formed.
Marc Jeroense, ABB, HVAC Power Transmission to the Gjøa Platform, gave a presentation, Dynamic Cables in a Dynamic World. (Appendix C-9)
In order to provide power to the Gjøa oil and gas platform in the North Sea two main technical challenges had to be solved:
1) Gjøa is a floating production facility located at a water depth of 380 m. A dynamic HV cable rising 380m from the sea-bed up to the floating platform was needed. The dynamic cable has to withstand the substantial mechanical stresses due to weather conditions and depth, and fatigue resistant materials are essential. Due to the high voltage of the power transmission, a radial water barrier was needed to reduce risk of water trees. No such cable has been developed or been commercially available earlier.
2) The Gjøa platform is located about 100 km northwest of Mongstad which was found to be the potential best connection point to the onshore grid. It was decided to establish an AC transmission system. Due to capacitive loading currents an AC system has a limited maximum length. To our knowledge this will be the longest submarine AC cable transmission for this voltage ever.
The following was done to solve the two main challenges:
1. A dynamic High Voltage XLPE cable was designed by ABB and StatoilHydro. The cable has double armouring and a welded copper sheath as a radial water barrier and screen for the cable. Lead is normally used for this purpose but due to the extensive dynamic mechanical loading of the cable, lead cannot be used in this application. Without the required fatigue properties of the screen it will loose its function both as a water barrier protecting the XLPE insulation and as an electrical conducting sheath. It is the first time ever welded copper is used as a screen in a high voltage submarine cable. The dynamic part of the cable is about 1.5 km with 300 mm2 copper conductors. The remaining 99.5 km (the static part) has 240 mm2 copper conductors and a lead sheath. This section is designed for a water depth of about 550m. The two parts were spliced in a transition joint. The cable was designed for Um=123 kV.
2. The overall AC transmission system is based on voltage regulation at the onshore end where a regulating transformer connected to the 132 kV onshore grid is feeding the cable. The voltage will be regulated in order to keep the voltage offshore constant at 90 kV. The transmission voltage was optimized to reduce total losses during the lifetime (based on the load profile to Gjøa). A higher voltage would reduce losses at high load but increase losses in low load situations due to capacitive current from the cable. A lower voltage would do the opposite.
A fibre optic cable with 48 fibre elements was integrated in the cable. The fibre optic cable is used for main communication from the platform to shore, temperature monitoring close to the platform as well as regulation of the electrical system onshore.
Glen Bertini, Novinium
Glen explained the technical challenges in delivering cable injection fluid through long submarine cables. See the presentation, Lessons in Submarine Cable Rejuvenation, located in Appendix C-10.
Hon Suen, B.C. Hydro
Hon presented a review of the installation of the new 230-kV submarine cable to serve Vancouver Island, which was completed in Dec 2008. See the presentation, Vancouver Island Transmission Reinforcement Project, Installation of 84 km (52 miles) 230kV PPLP Submarine Cable, located in Appendix C-11.
Jim Pachot, Poseidon Engineering
Jim explained the trials and tribulations of locating a fault in the submarine cable that serves Anderson Island. The fault was caused by a subsea landslide, and the cable had been severed. See the presentation, Anderson Island Fault Finding, located in Appendix C-12.
We will be holding a committee meeting at the upcoming ICC meeting in Scottsdale. At this time we have two agenda items:
Please let me (Neal Parker) know if you have a topic that you would like to discuss or a presentation that you would like to make.
The Group met on November 11, 2009, at 8:00 AM, with 46 individuals in attendance.
Three presentations were made and a discussion was held to address a negative ballot that was received during the reaffirmation process:
Minutes:
Johan Karistrand, ABB
CIGRE B1-27 “Test Recommendations on XLPE AC Submarine Cables from 170 kV to 500 kV” located in Appendix C-8.
Danijela Palmgren, ABB
“ABB’s Recent Submarine Cable Projects”, located in Appendix C-9.
Harry Orton, OCEI
“Submarine Cable Installation by Barge – A Cheaper Alternative”, located in Appendix C-10.
Submarine Cable Guide
The guide will expire at the end of this year. It was balloted for reaffirmation. One negative ballot was received. The negative ballot concerned the mention of DC testing of submarine cables in section 8.6.2 of the current guide.
The members of the working group think that DC testing of certain cable designs, under certain conditions, can be a worthwhile test. It was noted that “IEEE 400.1 Guide for Field Testing of Laminated Dielectric, Shielded Power Cable Systems Rated 5 kV and Above with High Direct Current Voltage” specifically addresses DC testing of cables.
It is not within the scope of IEEE 1120 to specify the conditions when DC testing of cables is or is not advisable. The nature of the Guide, as stated in its Scope, is to “provide a list of factors to consider…” when dealing with submarine cables. The Guide is not intended to be prescriptive.
It was agreed that the working group should consider including a reference to the IEEE 400.X series of standards that deal with cable testing in the next revision of IEEE 1120. Such a reference would point the user to a more complete
discussion of the topic of field testing of cables.
The working group of 1120-2004 appreciates the comment, but it was agreed that it does not indicate a significant error or omission, hence the reaffirmation will move forward. However, the comment will be saved for possible future revision of the Guide.
