Ap

pli

ed S

up

erco

nd

uct

ivit

y R

esea

rch

-

Un

iver

sity

of

Cam

bri

dge

B.A.Glowacki

Resistive barriers - electric decoupling

10-4

10-3

10-2

10-1

100

101

102

0.1 1

BaZrO3 bariers Pure Ag

Normalised current , I/Ic

I4.5

I2

For ac self field application induced by transport current the use of the electric barriers may appeared to be detrimental, especially when the engineering critical current value is substantially reduced.

Required conductors with small coupling current decay time constant short twisting pitch length and high effective interfilament transverse resistivity : = lt

2/e

Ap

pli

ed S

up

erco

nd

uct

ivit

y R

esea

rch

-

Un

iver

sity

of

Cam

bri

dge

B.A.Glowacki

Alloyed matrix better but p filament shape more important

twisted

twisted

The loss contribution from the eddy current loss to the total loss is quite small at 50Hz

Filaments are more of an elliptical shape therefore there are higher losses.

85 filaments

37 filaments

Ap

pli

ed S

up

erco

nd

uct

ivit

y R

esea

rch

-

Un

iver

sity

of

Cam

bri

dge

B.A.Glowacki

3 phase Superconducting Cable

LN2

Superconductor

Electric Insulation

Thermal

super- insulation

SIEMENS

American Superconductor

Cable