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EPRI SCDC Cable Review Meeting Palo Alto 24 th October 2006

EPRI SCDC Cable Review Meeting Palo Alto 24 th October 2006. Meeting May 22-26th Sevenoaks UK Progress since. Sevenoaks Meeting: 22-26 th May 2006. Agreed cable types: 2 x monopoles 100% redundancy Agreed target ratings: 10 GW (2x10 GW) 2 GW (2 x 1 GW)

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EPRI SCDC Cable Review Meeting Palo Alto 24 th October 2006

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  1. EPRI SCDC Cable Review MeetingPalo Alto 24th October 2006 • Meeting May 22-26th Sevenoaks UK • Progress since

  2. Sevenoaks Meeting: 22-26th May 2006 • Agreed cable types: • 2 x monopoles • 100% redundancy • Agreed target ratings: • 10 GW (2x10 GW) • 2 GW (2 x 1 GW) • Developed cable design spread sheet • Add BSCCO PIT characteristic: I, H, T • Actions: (See Bill’s slides) • Method to determine Magnetic field and PIT current/wire at outer surface of inner conductor • Circulate spreadsheet • In parallel prepare vacuum and cryogenic info to add • In parallel to add cable losses • In parallel to add circuit parameters

  3. Progress Since May • Spread sheet: • Added magnetic field and PIT current/wire at outer surface of inner conductor • Circulated Spreadsheet and ‘instructions’ • Patent proposals submitted to EPRI: ‘contraction compensation’ • Produced draft DC cable ‘design primer’ • Performed preliminary sensitivity study to identify limiting boundaries (to present later) • Performed outline search for extrudable insulation materials

  4. DC Cable Configuration

  5. Bi-Pole’s Advantages: Simplest Construction, Half-Insulation Thicknessand Smaller Diameter and Longer CableConventional Bi-Pole Designs are Unsuitable • No ground return, so lose one cable, lose circuit. • Mutual magnetic field is perpendicular to PIT conductor • Ground conductor is added to give N+1 security • No outer HTSC shield: field is not contained • Mutual magnetic field is perpendicular to PIT conductors

  6. Selected Design: Two MonopolesGround Returns Must be Current Carriers Integrated HTSC Ground return conductor +ve pole -ve pole Integrated HTSC Ground return conductor • Half insulation thickness of one monopole • One third insulation thickness of a single integrated bi-pole • Ground conductors are added to give N+1 security • Concentric HTSC conductor: field is parallel to PIT: OK • No mutual magnetic field Does this cause problems to the bridge design and control? Opposite or same polarity poles?

  7. DC Cable Sensitivity Study: Boundary Limitations • Dry cable construction, extruded insulation, can be factory HV tested, joints are simplest. • Voltage and current: no restriction • Fault circuit current: 2 x rated current for 1 sec and 1K rise • Maximum number of tapes in one pass on present stranding machines is 150. Perhaps extend to 250? (Need to ask manufacturers). See video of cable factory. • Reel: • outer diameter: 4.2m • hub diameter: 20D (D is cable OD) • Width:2.4m (could increase) • Cable net weight: 30ton (could increase). • Installation: See video of cable factory • Tensile load: F=COF x Unit Mass x Length • Maximum safe load on cable= 50N/mm2 of stranded conductor area. • PIT tape: • Present BSCCO minimum bend diameter: 70mm • Will tape width conform to circumference?

  8. Present Spread Sheet Limits for 75mm OD Conductor Show: • We need more tapes than present strander machine limit of 150 tapes • Optimum voltage is ~100-120kV

  9. For 75mm OD Conductor: • 1 GW rating is OK • 2 GW: too many tapes needed

  10. No Duct Case: • 1GW Cable is OK at 70kV and above with <150 tapes • Optimum voltage for min OD is 120kV • Max cable length on reel is 6.2kM, but reel weight is high at 38.4t

  11. 20mm Duct Case: • 1GW Cable is OK at 70kV and above with <150 tapes • Optimum voltage for min OD is 120-150kV • Max cable length on reel is 4.4kM, but reel weight is OK at 27-32t

  12. 40mm Duct Case: • 1GW Cable is OK at 70kV and above with <150 tapes • Optimum voltage for min OD is 100-120kV • Max cable length on reel is 2.8kM and reel weight is OK at 22-25t

  13. 1 GW with no central duct: Optimum voltage is 120kV

  14. Minimum voltage is 70kV, OK for <150 wires

  15. At optimum 120kV only need 76 wires, so can double current and power to 2GW?

  16. 1GW Study Conclusions: To achieve 5 GW need: 5 x Increase in current per tape, or a very long factory strander, or a multi-pass application?

  17. 1GW: Unit weight falls with voltage

  18. 1GW with no central duct: very long length is possible

  19. 120kV Constant Voltage and Increment Current and Power with BSCCO 125A: • At 150 tape limit can achieve 1.8GW • At 316 tape limit can achieve 3.6GW • At 450 tape limit can achieve 5GW • At 5GW, reel length falls to 2km • At 5GW, reel weight is high at 56.5t

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