1 / 25

Rosanna Cocimano for the NEMO Collaboration

International Workshop on a Very Large Volume Neutrino Telescope for the Mediterranean Sea. A comparison of AC and DC power feeding systems based on the NEMO experiences. Rosanna Cocimano for the NEMO Collaboration. 22-24 April 2008, Toulon Palais Neptune Conference Centre. AGENDA.

stimms
Download Presentation

Rosanna Cocimano for the NEMO Collaboration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. International Workshop on a Very Large Volume Neutrino Telescope for the Mediterranean Sea A comparison of AC and DC power feeding systems based on the NEMO experiences Rosanna Cocimano for the NEMO Collaboration 22-24 April 2008, Toulon Palais Neptune Conference Centre

  2. AGENDA • NEMO PHASE 1 ELECTRICAL POWER SYSTEM - AC THREE- PHASE • NEMO PHASE 1 POWER CONTROL SYSTEM • NEMO PHASE 2 ELECTRICAL POWER SYSTEM – DC • PRESSURE TEST ON ELECTRIC AND ELECTRONIC COMPONENTS

  3. NEMO PHASE 1 - ELECTRICAL POWER SYSTEM FLOOR1 40 W 4 4 4 4 4 4 4 4 ~ ~ ~ ~     ~ - - - - AC THREE PHASE MINITOWER OFF SHORE ON SHORE FLOOR4 40 W 40 m SHORE STATION FLOOR3 40 W 40 m FLOOR2 40 W 40 m JUNCTION BOX 100 m POWER SUPPLY TOWER BASE 25 km 4 X 4 mm2 300 m 4 X 4 mm2 7 KVA 660 V / 400 V 10 KVA 0  1200 V

  4. NEMO PHASE 1 – THE JUNCTION BOX • In the Junction Box there is 1 input line and 4 output lines. It is present a step-down transformer of 7 kVA. The input voltage is 660 V (line-to-line) while the output one is 400 V (line-to-line). • In each line there is: • a breaker that can be switched on and off from the on-shore control panel, • voltage and current measurements, that can be monitored from the on-shore control panel. • At the input a power control supply system is connected, it is realized by a NORMAL linear power supply and a REDUNDANT one. For them a suitable protection system is used. INPUT 660 V AC OUTPUT 1 400 V AC OUTPUT 2 400 V AC OUTPUT 3 400 V AC OUTPUT 4 400 V AC

  5. NEMO PHASE 1 – THE FLOOR POWER MODULE In each floor is present a FLOOR POWER MODULE that hosts the AC/DC linear converters and the floor control system. The load power supply contain a a six-pulse rectifier. The input voltage is 400 V AC (line-to-line) and the output voltage are: 12 V,3.5V, 5.5V DC . In the module is present a breaker and current and voltage measurements. DC OUTPUTS 12 V DC 5,5 V DC 3,5 V DC INPUT 400 V AC FLOOR POWER MODULE

  6. AGENDA • NEMO PHASE 1 ELECTRICAL POWER SYSTEM - AC THREE- PHASE • NEMO PHASE 1 POWER CONTROL SYSTEM • NEMO PHASE 2 ELECTRICAL POWER SYSTEM – DC • PRESSURE TEST ON ELECTRIC AND ELECTRONIC COMPONENTS

  7. NEMO PHASE 1 - POWER CONTROL SYSTEM THE POWER CONTROL SYSTEM IS ABLE TO: • acquire physics parameters such us temperature, humidity andpressure inside the boxes and acquirethe values of current and voltage in each line • switch the power on and off to each feeding line under ordinary conditions and reveal the electric fault and remotely control the breakers in order to isolate the portion interested by the fault, set the breaker threshold from remote . DURING DESIGN WAS IMPORTANT: • foresee the storageof as much as possible devicesin an oil and high pressure environment, to reduce the pressure vessel dimensions • use, where it is possible, commercial devices already tested and used, • minimize the failure points to maximize reliability, • foresee the right redundancies. Both the power supply and all boards and sensors of the power control system are redundant, so there is a NORMAL power control system and a REDUNDANT one.

  8. NEMO PHASE 1 - POWER CONTROL SYSTEM ON-SHORE there is a USER INTERFACE that allows to supervise and control the system and store the data acquired. The FLOOR BOARDhouses a PIC 16F876 microcontroller : a communication channel allows the communication with the JBP MAIN BOARD by means of a conveyed waves modem JUNCTION BOX BREAKERS SENSORS ON SHORE ACQUISITION BOARDS FLOOR RS 485 BREAKER BREAKERS SENSORS SENSORS RS 485 CONTROL BOARDS MAIN BOARD (SC13 BOARD) MEDIA CONVERTER MEDIA CONVERTER OPTICAL FIBERS MODEM MODEM CONVEYED WAVES • The JBMAIN BOARD houses a SC13microcrocontroller that manages: • an ethernet interface that allows the communication with the shore station on optic fibres thanks to a media converter, • a serial comunication channel (RS 485) allows the communication with the local acquisition board, • a communication channel that uses a conveyed wave modem that allows communication with the floor board.

  9. NEMO PHASE 1 - POWER CONTROL SYSTEM USERS INTERFACE - RESULTS JUNCTION BOX INPUT JUNCTION BOX OUTPUT FLOOR POWERMODULE

  10. The START UP of NEMO PHASE 1 successfullytookplace the 12thofDecember 2006 at 12:00 pm. Eventhough some problemsoccursduringdeployment and connections, thankstoredundancies in the control system, the system didn’t loseanyfunctionality. The voltages and currentstemperaturesvaluesmonitoredwere in linewith the expectedones. The off-shore system wasmonitoredfrom remote (LNS – HOME) The voltages and currentsof the on-shore UPS and PowerSupplyweremonitoredfrom remote too. NEMO PHASE 1 - CONCLUSIONS

  11. AGENDA • NEMO PHASE 1 ELECTRICAL POWER SYSTEM - AC THREE- PHASE • NEMO PHASE 1 POWER CONTROL SYSTEM • NEMO PHASE 2 ELECTRICAL POWER SYSTEM – DC • PRESSURE TEST ON ELECTRIC AND ELECTRONIC COMPONENTS

  12. NEMO PHASE 2 - PREFECE In NEMO PHASE 2 the system willbefeeded in DC instedof AC THREE-PHASE so the power system hasbeenmodifiedfrom the PHASE 1 one. Following the experienceacquired : in NEMO F1 a conveyedwave system wasutilizedtocommunicate. Thischoiceallows a complete INDEPENDENCE of the powercontrol system from the data transmission system and from the opticalfibers. In NEMO F2 wedecidedtohave the same INDIPENDENCE from the data transmission system => don’t useopticalfibersbuttwistedpairs. Increase the sensorsto monitor the towercinematic and mechanicalbehaviorbothduring the furlingoperation and in steady state. Maintain the sameredundancies

  13. NEMO PHASE 2 - PREFECE In NEMO PHASE 2 The TOWER BASE hasreplaced the NEMO PHASE 1 Junction Box and so itwillbeableto : Monitor the output voltageof the ALCATEL DC/DC Monitor the voltageappliedto the towerbackbone and the currentconsumptionof the 16 floors Allows the towerbackboneswitch on and off House the media converterthatallows the fiberoptic/ twistedpairconversionnecessaryfor the communicationwith the on-shorecontrol system. A Goal of the new system wasto reduce powerconsumption and tohavespace-saving .

  14. NEMO PHASE 2 – MAIN ELEMENTS ALCATEL Electro-Optical CABLE 100 km Frame SHORE POWER FEEDING EQUIPMENT AC/DC 10 kW – 10 kV NEMO TOWER ALCATEL DC/DC 10KV / 400 V 10 kW ODI Wet- mateable connector • Medium Voltage converter: • P 10 kW • Vin 10 kV DC • Vout 400 V DC • Estimated Efficency > 90% at full load • Power Feeding Equipment : • P out 10 kW • V out 10 kV DC • a dummy load allows operational testing • Electro-optical cable: • V max 10 kV • R 1.5 Ohm/km • 20 optical fibers

  15. NEMO PHASE 2 – NEMO TOWER TOWER BASE FLOOR 16 FLOOR 1 B t B 1 B16 B 0 LOAD 20 W LOAD 35 W CONTROL SYSTEM DC-DC 1 TWISTED PAIR to supply the ODD FLOORS TOWER BASE ……… FLOOR 3 FLOOR 1 FLOOR 15 FLOOR 13 B t TOWER BACKBONE FLOOR 14 FLOOR 2 FLOOR 4 FLOOR 16 ……… B 0 LOAD 35 W 1 TWISTED PAIR to supply the EVEN FLOORS LOAD 20 W LOAD 35 W CONTROL SYSTEM DC-DC DC-DC DC-DC CONTROL SYSTEM CONTROL SYSTEM

  16. Normal Control System PCS NEMO PHASE 2 – TOWER CABLING SPI & 5.5 VDC Power Module FPMS 12V 5.5V 4.2V TOWER FLOOR PCS = POWER CONTROL SYSTEM FPMS = FLOOR POWER MODULE SYSTEM TOWER BACKBONE SPI & 5.5VDC Redundant Control System PCS Twisted Pair B-RS485 Normal Power Module & Control system Twisted Pair A-RS485 Redundancy Twisted Pair C-400VDC OddFloor Twisted Pair D-400VDC EvenFloor TOWER BASE

  17. NEMO PHASE 2 – TOWER BASE BLOCK DIAGRAM 400 V FROM THE ALCATEL DC/DC CONVERTER TO THE ODD FLOORS 400 V 400 V A TO THE EVEN FLOORS V 5 V BASE TOWER CONTROL SYSTEM PCS RS485 NORMAL DC-DC for the CONTROL SYSTEM OPTICAL FIBERS ETHERNET2SPI Media Converter RS485 REDUNDANT

  18. NEMO PHASE 2 – FLOOR POWER MODULE I I I V V V BLOCK DIAGRAM Upper floor +12V DC-DC Converter ON-OFF RTN +400V +5.5V +5.5V DC-DC Converter InputCircuit protection Input filter Output filter +4.2V Dissipative Regulator ON-OFF Redundant switch ON-OFF Main switch ON-OFF GND Control circuit DC-DC Status Lower floor I/O I/O SPI SPI +5.5V Redundant control Main control

  19. NEMO PHASE 2 – FLOOR POWER MODULE 160mm 100mm 100mm • MAIN CHARACTERISTICS : • Soft Start system • Overvoltage protection • Opt-isolated high voltage sensor • DC/DC 400V/5.5V 50W • Input and output filters • Output current and low voltage sensors • breaker to switch on and off the output low voltage line

  20. NEMO PHASE 2 – FLOOR DC/DC CONVERTER

  21. NEMO PHASE 2 –POWER CONTROL MODULE 130mm 55mm • The power control system is able to: • acquire voltages, currents, temperatures and pressure, • switch on and off the power to the backbone (high voltage) and to each floor (low voltage), • it is possible to set the breakers threshold from shore, • the system host a tri-axial magnetometer and an accelerometer to give the exact position of the floor. • the control system is redundant

  22. NEMO PHASE 2 – CONCLUSIONS • THE TOWER POWER AND CONTROL SYSTEM HAVE BEEN REALIZED AND TESTED • The goals of the power consumption reduction and of the space-saving have been successfully reached • NOW WE ARE READY FOR INTEGRATION AND TEST OF THE ENTIRE SYSTEM WITH DUMMY LOADS

  23. AGENDA • NEMO PHASE 1 ELECTRICAL POWER SYSTEM - AC THREE- PHASE • NEMO PHASE 1 POWER CONTROL SYSTEM • NEMO PHASE 2 ELECTRICAL POWER SYSTEM – DC • PRESSURE TEST ON ELECTRIC AND ELECTRONIC COMPONENTS

  24. PRESSURE TEST ON ELECTRIC AND ELECTRONIC COMPONENTS WHY WE DO PRESSURE TESTS: • The storage of as much as possible devices in pressure and oil environment is important for the containers design. In this way the steel pressure vessel houses only the electronic devices that cannot stay under pressure. • This solution will improve on reliability due to the reduced number of sealed connection that represent failure points. • It will improve on costs due to the reduction of its dimensions and to the use of low cost materials rather than expensive alloy such as standard titanium. OUR GOAL HAS BEEN TO TEST AND CHARACTERIZE THE MAXIMUM NUMBER OF ELECTRIC AND ELECTRONIC DEVICES UNDER PRESSURE IN AN OIL ENVIRONMENT

  25. PRESSURE TEST ON ELECTRIC AND ELECTRONIC COMPONENTS Tests have been curried out on: Transformers, contactors, Solid state relay, Vicor dc/dc converter, current and voltage hall effect trasducers, temperature sensor, quarts crystals, capacitors, microcontrollers, integrated circuits, various electronic components. Tests have been done for over two years in different iperbaric chambers at INFN- LNS (Catania), .), NURC- Nato Undersea Research Center (La Spezia). ALL THE COMPONENTS OF THE NEMO PHASE 1 POWER AND CONTROL SYSTEM WORKED UNDER PRESSURE, NOW WE ARE WORKING TO HAVE THE SAME RESULTS FOR NEMO PHASE 2. No failure have been detected in the majority of the components tested.

More Related