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Ok- Bae Hyun/KEPCO

IEA HTS Programme ExCo meeting 20-21 May 2010, Stockholm , Sweden. Recent Progress for HTS Power Technology R&D in Korea - HTS wire, Cable, and FCL -. Ok- Bae Hyun/KEPCO. S U NAM. R&D status of HTS CC. Commercialization of CC ~ 600 m/h @ 2 km-L, 4mm-w. High Throughput Process.

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Ok- Bae Hyun/KEPCO

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  1. IEA HTS ProgrammeExCo meeting 20-21 May 2010, Stockholm, Sweden Recent Progress for HTSPower Technology R&D in Korea - HTS wire, Cable, and FCL - Ok-Bae Hyun/KEPCO

  2. SUNAM R&D status of HTS CC Commercialization of CC ~ 600 m/h @ 2 km-L, 4mm-w High Throughput Process

  3. Fabrication processes for each layer • EDDC : Evaporation using Drum in Dual Chamber (Batch type RCE) • Evap. : Evaporation with e-beam. • Production speed is 4 mm wide equivalent

  4. 30 30 30 35 25 Sm 20 Ba 40 15 10 45 45 50 55 60 65 Cu Fabrication of 100 m long- SmBCO CC by IBAD-EDDC (KERI) Halogen heater SmBCO 100m ~15 mTorr Buffered Substrate O2 Differential pumping Compositional ratio. TMP TMP ~10-5 Torr Cryo Pump Sm (SG) Ba (LG) Cu (LG) 100 m

  5. Ic properties of EDDC – SmBCCO CCs • 2008 CC : • High Ic was obtained but many critical defects were existed. • 2009 CC : • Ic was enhanced and the number of critical defects was reduced. • Ic was decreased but its uniformity was improved in 60 m long section.

  6. Jc-B-Θ property of EDDC - SmBCO CCs Normalized magnetic field(H//c) dependence of critical current density( Jc) • Jc-B property of EDDC-SmBCO was found to be superior compared with commercial YBCO • EDDC-SmBCO without any doping shows c-axis flux pinning effect but its relationship with microstructure is not clear.

  7. Continuous High Speed Transport Ic Measurement (HSTM) system • Current control to keep the measured voltage as critical voltage criterion • Reel to reel system & DSP control / High speed Ic meas. > 400 m/h + Current for P/S to HTS conductor Vref (Critical voltage criterion) PI DAC P/S current reference  critical current - Current lead V:measure voltage K*V1/n HTS conductor Motor & tension control (Linearization of the control voltage) Conventional R2R Transport Mes. Conventional R2R hall sensor Mes. Current tap Voltage tap

  8. New non-contact type Ic measurement system Gap(between hall sensor and superconducting layer) dependency of Ic is smaller for new system Calibration point Applied magnetic field Super current flow CC tape I+ I- Cross sectional view Z Noise I+ I- X Y Using Ampere law Define A= line integration of magnetic field of left loop B= line integration of magnetic field of right loop From the scanning magnetic field, Ic=78.2 A From the conventional 4 probe method Ic=84 A The deviation is caused by the noise of data

  9. SUNAM Properties of IBAD template (SuNAM) In-plane texture of buffer layers • Multi-turn IBAD system with max. spool size ~ 2 km. Dfof MgO (220) in production : 7 ~ 8 o . IBAD-MgO Homo-epi MgO

  10. SUNAM R2R – RCE system by SuNAM • Use of inexpensive metal source. • High rate deposition ( > 10 nm/sec) • Process speed : < ~ 600 m/hr. • Optimization underway. Heater 29 Multi-turn R2R Metal tape QCM computer Feedback program E-gun (30 KW) Y, Sm Cu Ba • Source for metal evaporation : 30 kwpierce e-gun • Substrate transportation : Multi-turn R2R system, more than 20 turns

  11. SUNAM Ic properties of GdBCCO CCs by R2R-RCE Min Ic : 220 A/cm-w Ave Ic : 298 A/cm-w Max Ic : 340 A/cm-w Min. Ic : 265 A/cm-w L : 120 m Measured by HSTM V-V distance : 60 cm GdBCO Surface after annealing

  12. SUNAM High Critical Current GdBCO CCs by R2R-RCE

  13. REBCO CCs by EDC and R2R-RCE • Ic of 637 A/cm was achieved for 3 μm-thick EDDC-SmBCO CC. But, critical defects due to de-lamination were observed for long CC tapes. • High performance Ic measurement systems were developed. • New hall sensor measurement system using Ampere law • High speed transport measurement (HSTM)system • R2R Pilot line for the production of CC was installed in SuNAM Co. • De-lamination problem was resolved for R2R-RCE CCs • R2R-RCE process for high & uniform Ic of GdBCO CCs was established • Min. Ic of 220 A/cm-w at 77 K for 200 m-long CC • Highest Ic of 510 A/cm-w at 77 K for short sample

  14. Development of HTS Cable HTS Cable by LS Cable HTS Cable of LS Cable • DAPAS Project in Korea - Project period : 2001~2011 - Total budget : $146million (Gov. : $100million / Industry : $46million) - Participant : LS Cable, KEPCO, KERI • 22.9kV 50MVA - Location : KEPCO’s I-cheon Substation - Development : 2008 ~ 2011 - Length : 500m - Accessory : 2 Termination, 1 Joint, Cooling system - Equal to 5 circuit of Cu cable 22.9kV • 154kV 1GVA - Type test, 2010 (Gochang Power Testing Center) - PQ test, 2011 - Real grid application : 2012 ~ - Equal to 6-8 circuit of Cu cable 154kV 22.9kV 50MVA 154kV 1GVA Accessory ** DAPAS : Development of Advanced Power system by Applied Superconductivity tech.)

  15. Year 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 DAPAS (MEST) 1st Phase 2nd Phase 3rd Phase Fundamental Design 1,000MVA 154kV Single Core 30m Type Test PQ Test Evaluation. Fab. 50MVA/100m 3-Core 50MVA/30m 3-Core 22.9kV Evaluation Type test 1ST Proto TYPE NEW Project (MKE) 22.9kV 50MVA, 500m Real-grid application (I-cheon Substation) Application HTS Cable by LS Cable - milestone • 22.9kV HTS Cable has been developed and new project deploying on Real-Grid started . • 154kV 1GW HTS power cable is under development till 2010. (Type Test) / 2011 (PQ Test) Milestone

  16. HTS cable application – 22.9 kV, 500 m 3-Core HTS Cable Cooling System Termination

  17. HTS cable operation by KEPCO Cryogenic system DS CB 154/22.9kV M.TR (#5) 50MVA HTS cable HTS Cable 500m Splicing 22.9kV, 50MVA, 500m HTS Cable layout (Ichon SS) HTS cable circuit • 22.9kV, 50MVA, Real Grid Project • Route length : 500m • Location: KEPCO’s I-cheon substation • Installation & Commissioning : 2010 • Operation: 2011 ~ Termination HTS cable (Underground part)

  18. 154 kV HTS cable • 154kV 1GVA - Type test, 2010 (Gochang Power Testing Center) - PQ test, 2011 - Real grid application : 2012 ~ - Equal to 6-8 circuit of Cu cable - World best power transmission performance acquisition (1GVA) • A 154kV 1GVA HTS termination was designed, manufactured, and successfully tested in accordance with IEC 60141-1 • Extra DC voltage test was performed successfully

  19. Withstand Voltage Test (14 kV Termination)

  20. Hybrid SFCL - evolution HTS • Superconductor • HTS + SW • Hybrid (1/2 Hz limiting) • Hybrid (1/2 Hz non-limiting) • PCL Hybrid • Possibly useful at medium voltages VI HTS HTS HTS ? DC S/W Power fuse Reactor Reactor/Limiter SB VI DC Reactor/Limiter SB Peak current limitation

  21. Fast switch enabling a FCL 14kV/12.5kArms, 1 phase fault test • step 1 : fast fault detection • step 2 : triggering mechanical fast switch • immediately through the controller, • by a capacitor bank energy • step 3 : initiating to open and generate arcing • of the contact at the same time • step 4: interruption of main circuit when current • become zero • step 5 : commuted to parallel current limiting • resistor

  22. FCL – Peak current limiting type Concept of the PC-FCL • Double line commutations  2 stage current limitation • S1 to limit the fault current for the first ½ cycle upon fault • S2 to limit the fault current after the first ½ cycle • Reducing the voltage stress of the S1 switch through a parallel resistor Type 2(mode-2) Mode 1+2 Peak control(mode-1)

  23. Peak current controlled FCL by semiconductor SWs Simulated wave Real circuit for the PC-FCL Use one or multiple module of an IGBT and a resistor in parallel

  24. Peak current controlled FCL 14kV/12.5kArms, 1 phase fault test CT CLR controller (S2) Mechanical fast switch Fast fault detector PCR Rogowski coil (S1) Solid state module Driver

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