[ table iii. sfcl module design parameters ] time [ms] · a resistive type sfcl module to reduce...
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Jooyeong So1, Seyeon Lee1, Woo-Seok Kim1, Ji-Kwang Lee2, Kyeongdal Choi1
1: Korea Polytechnic University, 2: Woosuk University
Design of an HTS Fault Current Limiting Module
for an MVDC Power Grid
1. Introduction
Thu-Mo-Po4.11-07 [80]
We have studied a DC circuit breaker with an HTS fault current limiting
module for an MVDC power grid.
Among several 2G REBCO conductors from different suppliers, we
selected the most suitable conductor based on the short circuit tests with
sample conductors.
A stabilizer-free REBCO conductor was chosen for a fast reaction to the
fault current. A design work for an MVDC class FCL module was
carried out and verified by simulation.
2. SFCL for DCCB
0 5 10 15 20 250.0
0.1
0.2
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0.6
0.7
0.8
300 [K]
Res
ista
nce
[O
hm
/m]
Time [ms]
50[V/m]
45[V/m]
40[V/m]
35[V/m]
30[V/m]
25[V/m]
20[V/m]
0 5 10 15 20 250.00
0.05
0.10
0.15
0.20
0.25
0.30
Resi
stance [
Ohm
/m]
Time [ms]
50[V/m]
45[V/m]
40[V/m]
35[V/m]
30[V/m]
25[V/m]
20[V/m]
300 [K]
0 5 10 15 20 250.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Res
ista
nce
[O
hm
/m]
Time [ms]
50[V/m]
45[V/m]
40[V/m]
35[V/m]
30[V/m]
25[V/m]
300 [K]
0 5 10 15 20 250.00
0.05
0.10
0.15
0.20
0.25
0.30
300 [K]
Res
ista
nce
[O
hm
/m]
Time [ms]
150[V/m]
145[V/m]
140[V/m]
135[V/m]
130[V/m]
125[V/m]
120[V/m]
115[V/m]
110[V/m]
105[V/m]
0 5 10 15 20 250.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16300 [K]
Res
ista
nce
[O
hm
/m]
Time [ms]
150[V/m]
145[V/m]
140[V/m]
135[V/m]
130[V/m]
125[V/m]
120[V/m]
115[V/m]
110[V/m]
105[V/m]
100[V/m]
We prepared the DC overcurrent test system with a supercapacitor of 500
F for the short circuit test with the selected sample HTS conductors.
The maximum applied voltage on the supercapacitor was 14 V, which
generated the fault current of 1,750 A.
The sample HTS conductors were attached on the FRP holder and
immersed in the liquid nitrogen vessel for the short circuit test.
4. DC overcurrent test system
5. Overcurrent test Result
3. 2G HTS sample conductors
6. Design of fault current limiting module
The amount of the stabilizer will affect the resistivity of the HTS
conductor, so that it will define the general performance of the HTS
fault current limiting module and the total amount of the HTS conductor.
We selected five different kind of the HTS conductors to be tested for
their overcurrent performances.
A resistive type HTS current limiting module in series to the DCCB
would reduce the burden of the DCCB when the fault occurs.
7. Conclusion
(a) AMSC 4 mm (b) AMSC 12 mm (b) Superpower 12 mm
(b) SuNAM 12 mm (b) SuNAM(SF) 12 mm
[ Fig. 1. Circuit diagram of the DC circuit breaking system with an SFCL module ]
[ TABLE I. Specifications for each conductor ]
[ Fig. 2. Cross-section diagrams
of each sample HTS conductor ]
[ Fig. 3. DC overcurrent test system ]
[ Fig. 4. circuit of the test system ] [ Fig. 6. HTS sample and holder ]
[ Fig. 7. Overcurrent test result for the HTS samples]
[ Fig. 8. non-inductive bifilar coil ]
[ TABLE II. DC circuit
breaker for FCL ]
[ TABLE III. SFCL module design parameters ]
[ TABLE IV. Design parameters of SFCL
module with non-inductive bifilar coil]
[ Fig. 9. simulated fault current limitation
in 15 kV DC grid]
[ Fig. 10. Magnetic field calculation for the
HTS FCL module ]
A resistive type SFCL module to reduce the burden of a 15 kV class DC circuit
breaker was designed with various kind of 2G REBCO conductors and the current
limiting performance was verified by simulation.
The SFCL module with Stabilizer-free HTS conductor shows faster reaction to
the fault current and shorter duration time.
A scale-down SFCL module will be fabricated and tested in near future.
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