FIBRE OPTIC CABLE: THE NEXT BIG THING FOR SUBSEA CONTROL? FOR - - PowerPoint PPT Presentation

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FIBRE OPTIC CABLE: THE NEXT BIG THING FOR SUBSEA CONTROL? FOR SUBSEA CONTROL?

Antoine Lecroart

Alcatel-Lucent Submarine Networks

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Presenter Profile

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Antoine Lecroart Business Development Director Email: antoine.lecroart@alcatel-lucent.com Tel: (+33) 1 30 77 79 12 Mobile Tel: (+33) 6 07 89 61 60

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• Submarine Connectivity Solutions

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Dry-Wet vs. Dry-Dry

• Traditional Systems are Dry-Dry

– With cable, repeaters, BUs being wet

• – Being adapted to floating structures (Platforms or FPSOs) with

dynamic risers

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Dry-Wet vs. Dry-Dry

• Very different to go Dry-Wet

– Terminal needs to be wet

• Environmental challenge
• Sufficient reliability required

(MTTR is many months not a few hours)

• Maintainability is key
• Maintainability is key

– Power needs to be treated differently

• More power required locally on the sea bottom
• Variable loads

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Example of a Dry-Wet Application: The NEPTUNE Canada Cable Science Observatory

• North East Pacific Time-series Undersea Networked Experiments
• 6 Science Nodes
• Down to 3500 m
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Purpose of NEPTUNE Canada

• Enabling real time multi-discipline science

experiments over long periods by allowing scientists to plug-in instruments to pre- determined gateways (Science Nodes) with ROVs thanks to wet-mate connections ROVs thanks to wet-mate connections

• Each node has six Ports providing each:

– Protected GigE connections to shore – Up to 25 A of power at 400 V DC – PTP timing distribution

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NEPTUNE Canada Node

• ROV wet-mate connectors used to service the node

down to 3500 m

Node is in two parts: – Trawl Resistant Frame – Trawl Resistant Frame (TRF)

• Connected to the spur

cable with a detachable Cable Termination Assembly (CTA)

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NEPTUNE Canada Node

• Node Module (NM)

– Can be disconnected from the Science Instruments and the TRF for maintenance – Node module is made – Node module is made almost neutrally buoyant so that it can be handled by ROV – Composed of the MVC and LV/Comms pressure vessels

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LV/Comms Pressure Vessel

• Houses:

– Comms Module:

• 2.5 Gbit/s colored transponders

(East and West)

• IP Switches

(Redundant)

• Media Converters

– LV Module

• 400 V distribution
• Low Voltage

Converters

• Voltage, Current

protection per port

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Medium Voltage Converter (MVC) Pressure Vessel

– Reliable 10 kW 10 kV to 400 V DC converter in each node in each node – Parallel/Series arrangement

• f 48 elementary

converters

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DC Power Transmission Capability

60 80 100 120

% DC efficiency (%)

&'( &)*'$

20 40 100 200 300 400 500 600

AC efficiency (%)

length (km)

• AC (50Hz) cable systems inefficient over ~ 100 km
• DC systems can efficiently deliver power at 600 km

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Subsea Control

• System allowing the monitoring and the control

subsea of the different wells

– Actuation of various types of valves – Production and Injection wells surveillance

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Subsea Control Evolutions

• Move from copper wires to fiber

– More reach, more bandwidth (long tie backs)

• Move from proprietary protocols to IP

– Full advantage of TCP/IP solutions

• Move from hydraulics controls to electrical controls
• Move from hydraulics controls to electrical controls

– Less environmental risks

• Functionally not very different from NEPTUNE Canada!

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Example of Long Tie Back: Snohvit (~140 km)

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Snohvit Umbilical

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Why use a separate submarine cable?

– Submarine cable is an optimized and field proven solution for 10 kV electrical transport and fiber protection:

• Structure is based on a vault

to protect fibers against to protect fibers against hydrostatic pressure

• Fibers are mechanically

protected against tension and crush…

• Fibers are protected

against hydrogen

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Why use a separate submarine cable?

– The Telecom Industry has developed solutions for submarine cable maintenance:

• Deep sea repairs

(cable joints)

• Buit-in high reliability
• Buit-in high reliability

(25 year design life)

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DC & FO Step-out Outline Solution: UR (Un-repeatered)

• Example for three templates

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DC & FO Step-out Outline Solution: Repeatered

• Repeaters are inserted in the loop

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Conclusion

– A Submarine Cable solution is the most efficient solution to effect reliable communications and bring power subsea communications and bring power subsea – Tie backs can reach 500+ km thanks to the use of in line repeaters – Cable and repeaters have demonstrated high reliability over 25 years – NEPTUNE is a live proof of concept

2010

enabling the next generation of networks & services

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Pacifico Convention Plaza Yokohama & InterContinental The Grand Yokohama 11 ~ 14 May 2010 www.suboptic.org The 7th International Conference & Convention

• n Undersea Telecommunications