Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione NEMOProject Phase 2

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Stazione a terra Survey Autorizzazioni e permessi Cavo elettro-ottico Branching Units Cable Terminations Assembly Operazioni Marine Operazioni a terra Shore Power Feed Equipment DC/DC Converter Nemo Phase 2 Composizione

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Ingresso Cavo Elettro-Ottico Nemo Phase 2 Shore Station

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione 17 mm Copper Shield 1.6 Ω/km Kg/m 70 kN 30 kN 500LW/900DA mm 10 kV 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

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione 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

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Interdisciplinary Activity Requests Electro-Optics Characteristics Intermediate Branching Unit Depth m Power 250 W DC 1 Fiber Optic ITU.T G.655 Depth m Power 500 W DC 1 Fiber Optic ITU.T G.655 Electro-Optics Characteristics Intermediate Branching Unit Depth m Power 250 W DC 1 Fiber Optic ITU.T G.655 Depth m Power 500 W DC 1 Fiber Optic ITU.T G.655 Nemo Phase 2 Branching Unit

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione 100 m 80 Km40 Km PFE 100 m Trunk End#2 Trunk End#3 Current Probe DC/DC Active BU Passive BU 100 m 7 Km 100 m 20 Km 100 m Trunk End#1 100 m Depth2.000 m Depth m Depth Passive BU Nemo Phase 2 System Layout 12 Km

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Nemo Phase 2 Marine Operations Project Management Desk top study Environmental Impact Assessment Authorization and permitting service Cable Route Survey Marine Geophysical Survey Topographic Landing Area Survey Diver Survey Reporting and Charting Route Clearance Pre Lay Grapnel Run Marine installation Cable loading Cable main lay Beach work and cable protection Post Lay Works Final Reporting and Charting

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Nemo Phase 2 Survey Capo Passero Catania 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 pesca Servizi esistenti ed in progetto Relitti ed impedimenti alla navigazione Dati sui danni subiti dai cavi sottomarini nell’area interessata dal cavo Sintesi dei risultati Confronto tra la rotta contrattuale e la rotta finale Rotta Contrattuale Rotta Finale e Diagramma di Linea Differenze tra la Rotta Contrattuale e la Rotta Finale Lista dei Contatti Sonar Lista dei Cavi Incrociati Datum orizzontale e verticale Topografia dell’area di approdo di Capo Passero Cable Route Survey Marine Geophysical Survey Topographic Landing Area Survey Diver Survey Reporting and Charting

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Nemo Phase 2 Configuration

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Converter n….. Converter PU Monitors PU Common Monitors Cable Termination Cubicle Dummy Load to line routing switch Power In system earth PU Controller Nemo Phase 2 Power Feed Equipment Block Diagram ALARM CONCENTRATOR SHELF OPTICAL FIBER DISTRIBUTION UNIT CABLE TERMINATING SHELF EARTH ISOLATION SHELF CONTROLLER SHELF

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Nemo Phase 2 BMH Capo Passero Approdo Catania Approdo

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione 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

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Nemo Phase 2 Active Branching Unit Control and Power Distribution

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione >BU Supervisory Functions Recovery Driver Command Sequence 3 X Current Share Request 3 X Apply Current Sharing 28.8 ms 1>1.2 s Main Driver Command Sequence 28.8 ms 1>1.2 s 3 X Configuration Request 3 X Confirm Configuration Request Command Sequence Recovery Driver Commands Delay between s Main Driver Commands Nemo Phase 2 DFME Auto Latching Branching Unit

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione A C B D (Earth) Fibres Optics Tray ReF Recovery receiver Recovery Zeners Main Zeners Splice Tray Main Zero Detect and Resistor Box Surge Coil Main Bridge Rectifier ReE Recovery Chassis Main Chassis Blank Chassis Fibres ReC RLB ReD RLA Main Smoothing Board Main Receiver Main Driver Pin Diodes Nemo Phase 2 Active Branching Unit

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione 5-7m1m 0.27m CTA Sea Hearth Connection Nemo Phase 2 Cable Termination Assembly

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione To shore Cable In VDC 10 kV Cable Out VDC 10 kV DC/DC 5-10 kW 400 Vdc Out Fibre Out 400 Vdc Out Fibre Out ROV connector JB DC/AC DC/DC 5-10 kW Nemo Phase 2 Cable Termination Assembly

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Sub Converter Topology used in the Neptune Project by JPL NASA Low stress design 600V transistors used to switch 200V Devices capable of working at 100 o C used at 36 o C Input filter Current sense Primary switching Output filter Synchronous rectifier Internal supply Tx 50V200V Gate Drive Nemo Phase 2 DC/DC Converter 10kV/400V

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Output diodes allows Large large scale failure of sub converter output sections or control with only reduced output current 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

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione 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

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Compact Physical Construction Pressure compensation using bellows Flourinert FC77 filled housing PCBs perpendicular to pressure vessel Ethylene Propylene O-Rings External connections Nemo Phase 2 DC/DC Converter Project

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Ground 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 Shore Power Supply Cathode Cathode Coating Sea Water Saturated Sand Soil Backfill Anode Coating Anode + 10 kV - 10 A - + Nemo Phase 2 Ground Return Electrodes

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione 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

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione FCM (Floor Control Module) Benthosphere Vin 400VAC Tower storeys ~ ~ - ~ ~ - ~ ~ - ~ ~ - Base Tower CONNECTION Secondary JB Second. JB - base tower Electro-optical cable Electric load storey 1 Electric load storey 2 Electric load storey 3 Electric load storey 16 Nemo Phase 2 Tower Power Distribution 400 VAC

Mario SeditaCatania 23-25/01/2006 Meeting di Collaborazione Nemo Phase 2 Diagramma Temporale