mario seditacatania 23-25/01/2006 meeting di collaborazione nemoproject phase 2

Mario Sedita Catania 23-25/01/2006Meeting di Collaborazione

NEMOProject Phase 2

NEMOProject Phase 2


Stazione a terraSurveyAutorizzazioni e permessiCavo elettro-otticoBranching UnitsCable Terminations AssemblyOperazioni MarineOperazioni a terraShore Power Feed EquipmentDC/DC Converter

Nemo Phase 2 Composizione


Ingresso Cavo Elettro-OtticoIngresso Cavo Elettro-Ottico

Nemo Phase 2 Shore Station


17 mm

Copper Shield

1.6 Ω/km

0.90-0.57 Kg/m

70 kN

30 kN

500LW/900DA mm

10 kV

1.600 V

10 A

100 kW

Cable Outer Diameter

Conductor Diameter

DC Resistance

Weight Air/Water

Cable Breaking load

Operating Tension

Min. Dynamic Bending

Working Voltage

Drop Voltage

Current

Power

Nemo Phase 2 Backbone Cable


Storey power load (4 OM + storey electronics + additional sensors) 20 W

x 16 storeys 320 W

+ additional power load at the tower base (electronics, sensors, …) 100 W

Total power load per tower 420 W

x 81 towers (5.184 OM) 34 kW

+ JB power load (electronics, sensors, …), 300 W per JB 3 kW

Total power load ~50 kW

Nemo Phase 2 Power Budget

+ additional power load as spare or associate science 10 kW


Interdisciplinary Activity Requests

Interdisciplinary Activity Requests

Electro-Optics Characteristics Intermediate Branching Unit

• Depth - 100 m Power 250 W DC 1 Fiber Optic ITU.T G.655

• Depth - 2.000 m Power 500 W DC 1 Fiber Optic ITU.T G.655

Electro-Optics Characteristics Intermediate Branching Unit

• Depth - 100 m Power 250 W DC 1 Fiber Optic ITU.T G.655

• Depth - 2.000 m Power 500 W DC 1 Fiber Optic ITU.T G.655

Nemo Phase 2 Branching Unit


100 m 80 Km40 Km

PFE

100 m

Trunk End#2 Trunk End#3

Current Probe

DC/DC

ActiveBU

Passive BU 100 m 7 Km100 m20 Km 100 m

Trunk End#1

100 m Depth 2.000 m Depth 3.500 m Depth

Passive BU

Nemo Phase 2 System Layout

12 Km


Nemo Phase 2 Marine Operations

•Project Management•Desk top study•Environmental Impact Assessment•Authorization and permitting service•Cable Route Survey

Marine Geophysical SurveyTopographic Landing Area SurveyDiver SurveyReporting and Charting

•Route Clearance•Pre Lay Grapnel Run•Marine installation

Cable loadingCable main layBeach work and cable protectionPost Lay WorksFinal Reporting and Charting


Nemo Phase 2 Survey

Capo PasseroCapo Passero

CataniaCatania

Risultati di dettaglio•Rotta percorsa durante il Survey•Descrizione degli allegati cartografici•Campionamenti del fondo marino•Attività di possibile interferenza con il collegamento•Fattori antropici

Attività di pescaServizi esistenti ed in progettoRelitti ed impedimenti alla navigazioneDati sui danni subiti dai cavi sottomarini nell’area interessata dal cavo

Sintesi dei risultati•Confronto tra la rotta contrattuale e la rotta finale

Rotta ContrattualeRotta Finale e Diagramma di LineaDifferenze tra la Rotta Contrattuale e la Rotta FinaleLista dei Contatti SonarLista dei Cavi Incrociati

•Datum orizzontale e verticale•Topografia dell’area di approdo di Capo Passero

Cable Route SurveyMarine Geophysical SurveyTopographic Landing Area SurveyDiver SurveyReporting and Charting


Nemo Phase 2 Configuration


Converter

n…..

Converter

PUMonitors

PU

CommonMonitors

CableTerminationCubicle

Dummy Load

to line

routingswitch

Power In

systemearth

PU Controller

Nemo Phase 2 Power Feed Equipment Block Diagram

ALARM CONCENTRATORSHELF

OPTICAL FIBER DISTRIBUTION UNIT

CABLE TERMINATING SHELF

EARTH ISOLATION SHELF

CONTROLLER SHELF


Nemo Phase 2 BMH

Capo PasseroApprodo

CataniaApprodo


High power flying ROV receptacle assembly

Specifications: ･ Dimensions 2.0x0.5x2.0(m) ･ Weight : 1200kg (in Air) ･ Pressure Resist : 4000m

Electro-Optical Flying ROV receptacle assembly

Nemo Phase 2 Passive BU


Nemo Phase 2 Active Branching Unit

Control and Power Distribution


>BU Supervisory Functions

Recovery DriverCommandSequence

3 X Current Share Request

3 X Apply Current Sharing

28.8 ms

1>1.2 s

Main DriverCommandSequence

28.8 ms

1>1.2 s

3 X Configuration Request

3 X ConfirmConfiguration Request

CommandSequence

Recovery DriverCommands

Delay between 75 - 100 s

Main Driver

Commands

Nemo Phase 2 DFME Auto Latching Branching Unit


A

C

B

D (Earth)

FibresOptics Tray ReF Recovery receiver Recovery Zeners

Main ZenersSplice TrayMain Zero Detect and

Resistor Box

Surge CoilMain Bridge Rectifier

ReE

Recovery Chassis

Main Chassis

Blank Chassis

Fibres

ReCRLB ReD RLA

Main Smoothing Board

Main Receiver

Main DriverPin Diodes

Nemo Phase 2 Active Branching Unit


5-7m 1m

0.27m

CTASea Hearth Connection

Nemo Phase 2 Cable Termination Assembly


To shore

Cable In

VDC 10 kV

Cable Out

VDC 10 kVDC/DC5-10 kW

400 Vdc OutFibre Out

400 Vdc OutFibre Out

ROV connector

ROV connector

JBDC/AC

DC/DC5-10 kW

Nemo Phase 2 Cable Termination Assembly


Sub Converter

Topology used in the Neptune Project by JPL NASA

Low stress design

600V transistors used to switch 200VDevices capable of working at 100oC used at 36oC

Input filter

Current sense Primary switching

Output filter

Synchronous rectifier

Internal supply

Tx50V200V

Gate Drive

Nemo Phase 2 DC/DC Converter 10kV/400V


Output diodes allows Large large scale failure of sub converter output sections or control with only reduced output current

10kV

400V

Control / start-up 1






10kV

400V







Sub converters input sections fail short circuit allowing large to fail without loss of output

In the event of the FET failing Open circuit the diodes fail short circuit, typically 0.5 to 1 ohm

X-Ray showing plate construction.Without bond wires, rupture current grater than 150A

Nemo Phase 2 DC/DC Design


Large diameter sea case is expensive and difficult to handle

PCBs are too large for most manufactures, limited number of suppliers

PCBs are too large for pick and place assembly machines, must be hand built

Physical Construction of First MARS Converter


Compact Physical Construction

Pressure compensation using bellowsFlourinert FC77 filled housingPCBs perpendicular to pressure vesselEthylene Propylene O-RingsExternal connections

Nemo Phase 2 DC/DC Converter Project


Ground Return CircuitGround Return CircuitGround Return CircuitGround Return Circuit

•Single conductor cable necessitates ground return electrodes

•Similar applications include:

–Gas generation

–HVDC Power Distribution

–Trans-ocean telecom systems

–Impressed current cathodic protection

I

V

Node Converters

ShorePowerSupply

Cat

hod

e

Cat

hod

e C

oat

ing

Sea

Wat

er

Sat

ura

ted

Sa

nd

Soi

l

Bac

kfill

Ano

de C

oatin

g

Ano

de

+ 10 kV -

10 A

-

+

Nemo Phase 2 Ground Return Electrodes


Active surface of electrode

Elastomer bend limiter

LW cable core passes through electrode. Outer armour wires terminated in a similar way to an armoured cable joint

Nemo Phase 2 Remote Earth Electrode

Mixed metal oxide coating

Ti grade 2 electrode structure

Insulated steel strength termination

Standard cable buffer

Earth conductor +redundancy


FCM

(Floor Control Module)

Benthosphere

Vin 400VAC

Tower storeys

~~-

~~-

~~-

~~-

Base Tower CONNECTION

Secondary JBSecond. JB - base tower

Electro-optical cable

Electric loadstorey 1




Nemo Phase 2 Tower Power Distribution 400 VAC


Nemo Phase 2 Diagramma Temporale

mario seditacatania 23-25/01/2006 meeting di collaborazione nemoproject phase 2

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