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Choi, Hyo-Sang,Hwang, Si-Dole,Kim, Sang-Joon,Han, Byoung-Sung The Korean Superconductivity Society 1999 Progress in superconductivity Vol.1 No.1
We investigated the current limiting characteristics of resistive and inductive SFCLs with 100 $\Omega$ of impedance for line-to-ground faults in the 154 kV transmission system. The fault simulation at the phase angles $0^{\circ}$, $^45{\circ}$, and $90^{\circ}$ showed that the resistive SFCL limits the fault current less than 17 kA without any DC component after one half cycle from the instant of the fault. On the other hand, the inductive SFCL suppresses the current below 14 kA, but with 5 kA of DC component which decreases to zero in 5 cycles. We concluded that the inductive SFCL has higher performance in current limiting effect, but the resistive SFCL was better from the viewpoint of less DC components.
Analysis on Current Distribution in Bi-2223/Ag Tapes with Applied Alternating Over-critical Current
Yim, Seong-Woo,Kim, Hye-Rim,Hwang, Si-Dole The Korean Institute of Electrical and Electronic 2004 전기전자재료학회논문지 Vol.17 No.6
Generally Bi-2223/Ag tapes have a broad S/N transition region and their sheath is a good electric conductor. In this study, the current distribution between superconductor and metal sheath in HTS tapes were investigated. AC with its peak value above 10 times $I_{c}$ was applied to HTS tapes for around 6 cycles and V-I characteristics were measured. Using the resistance of the sheath and V-I curves, the current distribution between superconductor and metal sheath was calculated. When 150 $A_{p}$ was applied, more than 2/3 of the current flows through superconductor. However, in the case of 304 $A_{p}$, most of the applied current came to flow through the metal sheath at the 6th cycle.e.e.e.
22.9㎸ 중성점 다중접지계통에 CD형 초전도케이블을 적용한 경우의 지락전류변화
李宗培(Jong-Bae LEE),黃時乭(Si-Dole Hwang),孫松縞(Song-Ho Sohn),李根準(Geun-Joon LEE) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
This paper discusses the effects of CD type superconducting cable operation in 22.9㎸ multi neutral grounded distribution system during L-G fault and counterplans to power system protection. In case of using the 3-phase CD-type superconducting cable, the inductance of superconducting cable system would be decreased due to the current of shield part of superconducting cable, which is opposite direction and nearly equal value with respect to main superconductor. However, when the shield circuit system is operated in shorted state, shield current decreases faulted ground current and give effects to power system protection scheme. This study examines the phenomena of single line to ground fault case in above mentioned system using the EMTDC program and discusses the right operation method of superconducting shield.
Application of Resistive Type SFCL to Protect Bi-2223/Ag Tape Against AC Over-Currents
Seong-Woo Yim,Song-Ho Sohn,Si-Dole Hwang,Ok-Bae Hyun,Sung-Hun Lim,Kishio, K. IEEE 2006 IEEE transactions on applied superconductivity Vol.16 No.2
<P>Based on the electrical behavior of Bi-2223/Ag tape in transient state, the possibility of SFCL application was investigated as a fundamental study for the protection of HTS power apparatus. For the experiments, the Bi-2223/Ag tape having the critical current of 56 A and the resistive type SFCL fabricated using three elements of YBCO thin films were examined. When the applied current exceeds the rated current of the SFCL, the current was limited to sufficiently low level, however, higher than 40 Vrms was not allowed considering power density of SFCL. On the other hand, as a method to increase the power density, a shunt resister across the SFCL was adopted to increase the allowed power density. In this case, the results showed that the over current was limited below the safe range for HTS tape and the SFCL was safe, although 100 V<SUB>rms</SUB> was applied to the circuit. In conclusion, the switching power capacity of a SFCL could be increased by using a shunt resistor, and HTS tape could be protected safely within the quench margin</P>