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MOA10PO04
Manufacture and Test of Small-scale Superconducting
Fault Current Limiter by Using the Bifilar Winding of
Coated Conductor
M.C. Ahn, D.K. Bae, S.E. Yang, D.K. Park, T.K. Ko,
Department of Electrical and Electric Engineering, Yonsei
University; C.J. Lee, Hyundai Heavy Industries Co., Ltd.;
B.R. Seok, Heavy Industries Co., Ltd.; H.M. Chang, Hong
Ik University.
Superconducting fault current limiters (SFCLs) have been
developed in many research groups. However, there is no
standard for current limiting device. Recently, YBCO
coated conductor (C.C.) which is named as 2nd-generation
wire has been developed rapidly. YBCO C. C. has many
advantages for applying to fault current limiting material. In
this paper, a bifilar winding type SFCL was manufactured
using YBCO C.C. The bifilar coil was wound as pancake
type and length of the used C.C. tape was 8 m. The shortcircuit
test of the SFCL was performed successfully rated
on 50V/100A. The SFCL has very low impedance in normal
operation and limited the fault current effectively when a
fault occurred. From the result, it could be confirmed that
the bifilar winding type FCL using YBCO C.C. is feasible.
Large-scale SFCL using C.C. should be developed in the
future.
MOA10PO05
Simulation Study on Operating Characteristics of
Superconducting Fault Current Limiter in Power
System
Y. Ye, Institute of Electrical Engineering, CAS.
Many studies have been reported on various types of
superconducting fault current limiters (SFCLs). They were
mainly about the characteristics of SFCLs themselves, and
there are a few studies on SFCL as a power system
apparatus. SFCLs are expected to improve reliability and
stability of power system. In this paper, a detailed
simulation model of a resistor type Superconducting fault
current limiter was proposed. Simulation studies were
performed in one-machine infinite bus system with parallel
transmission lines. Power system operating characteristics
of the SFCL were investigated and discussed by EMTDC
simulation results. The rotor oscillation of generator was
also analyzed with SFCL installed in power system.
Simulation results show that SFCL can effectively protect
synchronization both in a symmetrical three-phase fault
and single-phase fault. Limiting fault currents means not
only an improvement of circuit breaker abilities but also a
protection of synchronism.
MOA10PO06
Test of LC Resonance type of fault current limiter
K. Arai, H. Tanaka, M. Furuse, M. Umeda, AIST; M. Inaba,
H. Arai, T. Ishigohka, Seikei University.
A resonance-type superconducting fault current limiter
(FCL) was developed and tested in order to demonstrate
its concept and actual operations. The resonance type
superconducting FCL was originally proposed by Seikei
University, and after that, a large-scale experimental study
using its modified FCL was started by National Institute of
Advanced Industrial Science and Technology. This type of
FCL can minimized the normal transition in Bi-2223
superconducting pancake coils in it in case of an overcurrent
fault, and it can instantaneously return to steady
state operation after the fault is cleared. The tested
superconducting reactor has a toroidal configuration with
12 pancake-coil units where one unit includes 3 pairs of
pancake coils. The inductance of the reactor can be
variable from 5.5 to 50 mH by setting the combination of
the series and paralleled connections of those units. One
combination in three-parallel and four-series mode makes
a 200 A class FCL. The test result using 50 Hz alternating
current shows the current increases exponentially to a
saturated level of approximately 240 A, 1.3 times of steady
state current level, while it can be estimated to be beyond
1000 A in the case of using no FCLs. The time constant to
reach the saturation can be defined by the specifications of
the arrester voltage and the normal voltage level in the
superconducting reactor, which was experimentally
measured and confirmed also using the FCL in a different
connection of those units.
MOA10PO07
Current Limiting Characteristics of Inductive Type
SCFCL with ZnO Device and Resistor in Parallel
Y. Shirai, T. Morimoto, K. Furushiba, M. Shiotsu, Kyoto
University; K. Fushiki, J. Baba, T. Nitta, The University of
Tokyo.
Superconducting Fault Current Limiters (SCFCLs) can be
classified into two types by the current limiting impedance,
that is, inductive-type (L-type) and resistive-type (R-type)
SCFCL. Both types have merits and demerits each other.
The L-type SCFCL has good features in current limiting
and recovery characteristics. The R-type one can consume
the excessive energy of generators at a fault and it can
improve power system stability. In this paper, we proposed
a new FCL system which consists of a L-type SCFCL in
parallel with a resistor and a ZnO device. The proposed
system has good features of both L- and R-type ones. A
model system was made and studied experimentally. The
ZnO device is off-state in stand-by mode. When a fault
occurs, the SCFCL turns into current limiting mode and has
high impedance. The voltage across the SCFCL exceeds a
threshold voltage of the ZnO device. During one cycle of
the voltage, the ZnO device is on-state around the peak of
the voltage, and the current flows through both the SCFCL
and the resistor. A certain amount of excessive energy is
dissipated in the resistor. The ZnO device is off-state
around the peak of the current which is suppressed only by
the L-type SCFCL. Finally the proposed FCL system
toggles L-type and L+R-type in a cycle. Relations among
the threshold voltage, the current limiting impedance and
the resistance of the resistor were discussed. It was
confirmed the proposed FCL system represents desirable
current limiting characteristics.
MOA10PO08
Study of a novel high-Tc superconducting fault current
limiter
Z. Zhang, L. Xiao, Institute of Electrical Engineering, CAS.
Withdrawn.
MOA10PO09
Investigation of Electrical Insulation Characteristics in
the Simulated Quench Conditions of HTS FCL
B-Y. Seol, K. Nam, C. Lee, Electro-Mechanical Research
Institute, Hyundai Heavy Industries Co., LTD.
Withdrawn.
MOA10PO10
Design and Test of High-TC Superconducting Coils for
a Three-Phase 10.5kV/1.5kA Fault Current Limiter
Z. Wang, J. Zhang, D. Zhang, H. Li, Y. Guan, Q. Bao, L.
Lin, L. Xiao, ASCL, IEE.
The design of High Temperature Superconducting (HTS)
coils for a three-phase 10.5kV/1.5kA HTS fault current
limiter (FCL) is described. It is well known that the Ic of
HTS materials is very sensitive to the orientation of fields.
43 MT-19 2005, Genova