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Copyright © 2014 SWCC SHOWA CABLE SYSTEMS CO., LTD.ISS 2014 Funabori Tokyo

Creatingfor the Future

The Latest Trends ofMOD REBCO SuperconductingCoated Conductors in SWCC

SWCC SHOWA CABLE SYSTEMS CO., LTD.

Tsutomu Koizumi

IEEE/CSC SUPERCONDUCTIVITY NEWS FORUM (global edition) January 2015. Invited Presentation WT-9-INV given at ISS 2014, Tokyo, November 25 - 27, 2014.

Copyright © 2014 SWCC SHOWA CABLE SYSTEMS CO., LTD.26-Nov-2014 2ISS 2014 Funabori Tokyo


SWCC Showa Cable Systems Co., Ltd.

R. Hironaga, Y. Takahashi, K. Kimura,T. Nakamura, K. Takahashi, K. Shiohara,Y. Hikichi, M. Minowa,K. Adachi, T. Nakanishi, N. Mido,T. Hasegawa

Co workers




This work was supported byISTEC-SRLJapan Fine Ceramics CenterKyusyu UniversityTokai university

Acknowledgement

This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Materials & Power Applications of Coated Conductors.



Creatingfor the FutureToday’s topics

1) Introduction

2) MOD REBCO coated conductor in SWCC.i) Development of in-house substrate for MOD.ii) Mass production of YBCO coated conductor.

3) Application of REBCO coated conductorin SWCC

i) Development of compact superconducting current lead.

ii) Development of High-Tc superconducting power cable.

4) Summary



Creatingfor the FutureIntroduction

REBCO coated conductors have developed using the metal-organic deposition process including trifluoroacetates so called TFA-MOD method since 1999.

Moreover, we have used a reel-to-reel process for calcination process and batch-type furnace for crystallization process.

In 2008, we successfully developed 500m-class YBCO coated conductors which had the critical current values of 310 A/cm-width at 77 K in self field.

Moreover, we successfully developed a way for introducing artificial pinning centers and fabricated 100m-class REBCO withartificial pinning centers. We named “nPAD-YBCO®”. nPAD-YBCO® means nano-Particle Artificial-pinning-centerDistributed YBCO.



Creatingfor the FutureMOD REBCO coated conductor

Ni basedalloy

MgO

CeO2

Al2O3 etc

LaMnO3

REBCO

Ag

RF Sputtering

TFA-MOD

DC Sputtering

Highlyin-plane textured

CrystallizationCrystallization

CalcinationCalcination

Architecture ofMOD REBCO coated conductor RF SputteringRF Sputtering

Batch process




1) Introduction





4) Summary



Creatingfor the Future100m-class YBCO CC using in-house substrate

0

100

200

300

400

500

0 20 40 60 80 100 120Cri

tica

l cur

rent

(A

/cm

-wid

th)

Position (m)

YBCO film thickness: 1.4µmTape width: 5mm

Jc=2.5MA/cm2

@77K

We successfully developed in-house substrate.We successfully developed in-house substrate.

WTP-20 Y. Takahashi et. al.

⊿ CeO2 = 4°

@77K, Self field




1) Introduction





4) Summary




0

100

200

300

400

500

600

0 10 20 30 40 50 60 70 80 90 100

Piece length: 125 m(Total length: 12,500 m)

Cri

tica

l cur

rent

(A

/cm

-wid

th)

Production number

@77K, Self field

Tape width: 4~5mm

Yield = 85%

Production Resultsof 100m-class YBCO CC in 2014

We fabricated hundred pieces of 100m-long coated conductor.This yield was 80% more.We fabricated hundred pieces of 100m-long coated conductor.

This yield was 80% more.




1) Introduction





4) Summary



Creatingfor the FutureHigh Tc Superconducting current lead

220L×42W×14T

≦ 0.15W/piece

1500A

1500A class

220L×14W×14T

≦ 0.06W/piece

500A

500A class

220L×14W×14TSize (mm)

GFRPSupporting case

≦ 0.03W/pieceHeat leakage (@77K-4.2K)

77K-4.2KTemperature range (K)

250ARated Current(@77K,self field)

250A classParameters

ProblemSolving

Lineup of nPAD-YBCO® current leads

Bi-2223 Bulk Current lead nPAD-YBCO® Current lead

NEW

CompactLow heat leakageHigh mechanical performance

Widely available in various superconducting devices!Widely available in various superconducting devices!

Easy brokenExpensive

nPAD-YBCO®: nano-Particle Artificial-pinning-center Distributed YBCO

SAP-74 K. Takahashi et. al.




0

60

120

180

240

300

0 60 120 180 240

nPAD-YBCO® current lead

BI180

90

Angle (deg.)

Cri

tica

l cur

rent

(A

/cm

-wid

th) @77K, 0.5T

Angular dependence of critical current

REBCO film thickness: 1.4µm

In the case of used YBCO CC, we can not make a compact current lead. Because used many long tapes for overcome heart leakage dew to a YBCO CC was low Ic in a magnetic field.

However, in order to be able to develop nPAD-YBCO®, we successfully developed a compact current lead.




0

200

400

600

800

0

1

2

3

4

0 10 20 30 40

Cooling cycle testof nPAD-YBCO® Current Lead

Cooling cycles:300K 77KC

riti

cal c

urre

nt (

A/c

m-w

idth

)

Cooling cycle number

@77K, Self field Con

tact

res

ista

nce

(x 1

0-7

)

Rc

Contact resistance LN2

We carried out cooling cycle test for the 500A class current read.

The measurement of Iccarried out until 40 cycles every 10 cycles .

As this result, Ic and Rc of the current lead were not damage until 40 cycles.




1) Introduction





4) Summary



Creatingfor the FutureDevelopment of REBCO Power Cable

Now, under several tests.

0.5Iop/Ic

100mLength

(Current PJ goal)

YBCO (MOD)HTS material

30mmDiameter of conductor

130mmDiameter of cable

3Phases

70MWPower

CoaxialGeometry

35kVVoltage

ACType




We successfully developed in-house substrate.

We fabricated hundred pieces of 100m-long coatedconductor. This yield was 80% more.

We successfully developed compact superconducting current lead using REBCO coated conductor.

We started High-Tc superconducting power cable development.

Summary




2014

commercialization

NationalPJ

20162015201320122011

Summary

Commercialization of YBCO tape

Development of REBCO power lead

Development of HTS power cable

Standardization PJ for High-Tc power cable

Development of in-house substrate

Commercialization of YBCO Power lead

Savingenergy PJ

M-PACC

High-Tc Magnet PJ

Commercialization ofnPAD-YBCO®

Development of business plans toward commercialization




END


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