Applied Superconductivity Research - University of Cambridge B.A.Glowacki Resistive barriers -...
-
Upload
zoe-sinclair -
Category
Documents
-
view
217 -
download
0
Transcript of Applied Superconductivity Research - University of Cambridge B.A.Glowacki Resistive barriers -...
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