[논문]Fault Current Limiting Characteristic of Non-inductively Wound HTS Magnets in Sub-cooled <tex>$LN_2$</tex> Cooling System

Park Dong-Keun; Ahn Min-Cheol; Yang Seong-Eun; Lee Chan-Joo; Seok Bok-Yeol; Yoon Yong-Soo; Ko Tae-Kuk

doi:10.9714/psac.2006.8.2.029

Fault Current Limiting Characteristic of Non-inductively Wound HTS Magnets in Sub-cooled $LN_2$ Cooling System 원문보기

한국초전도·저온공학회논문지 = Superconductivity and cryogenics, v.8 no.2, 2006년, pp.29 - 32

Park Dong-Keun (Yonsei University) , Ahn Min-Cheol (Korea Electrical Engineering & Science Research Institute) , Yang Seong-Eun (Yonsei University) , Lee Chan-Joo (Hyundai Heavy Industries) , Seok Bok-Yeol (Hyundai Heavy Industries) , Yoon Yong-Soo (Ansan College of Technology) , Ko Tae-Kuk (Yonsei University)

Abstract ▼ AI-Helper

An advanced superconducting fault current limiter (SFCL) using $high-T_c$ superconducting (HTS) wire has been developed. The SFCL has a non-inductively wound magnet for reducing loss in normal state. Two types of non-inductively wound magnets, the solenoid type and the pancake type, were designed and manufactured by using Bi-2223 wire in this research. Short-circuit tests of the magnets were performed in sub-cooled $LN_2$ cooling system of 65 K. The magnets are thermally more stable and have a higher critical current in 65 K sub-cooled $LN_2$ cooling system than in 77 K saturated one. Because the resistivity of matrix at 65 K is lower than the resistivity at 77 K, the magnets generate a small resistance to reduce the fault current when the quench occurs. The magnets could limit the fault current to low current level with such a small resistance. The current limiting characteristic of the magnets was analyzed from the test result. The solenoid type was wound in parallel to make it non-inductive. The pancake type was also connected in parallel to be compared with the solenoid type in the same condition. The solenoid type was found to have a good thermal stability compared with the pancake type. It also had as large resistance as the pancake type to limit the fault current in sub-cooled $LN_2$ cooling system.

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문제 정의

The non-inductively wound HTS magnet by using Bi-2223 wire showed good characteristic fbr SFCL application. This research verified the feasibility of magnets using HTS wires as the SFCL. We are planning to design, to manufacture the SFCL using the coated conductor, and to perform the short-circuit test from now on.

제안 방법

We performed short-circuit tests of non-inductively wound HTS magnets in sub-cooled nitrogen, 65 K, to increase the magnet stability and to increase critical current of the magnets [5]. Fault current limiting characteristics of non-inductive wound magnets were analyzed from the experimental results by comparing with two types.
In this research, two types of non-inductively wound HTS magnet were designed and manufactured. Because sudden thermal increase can be generated by the unexpected fault current in cryogenic system of the SFCL, the thermal 마ability of cryogenic system is very important in the SFCL.
The short circuit tests are required to know the quench characteristics of non-inductively wound HTS magnets. The test was performed at single phase power system. Fig.

참고문헌 (6)

Giese R F, Runde M. Assessment study of superconducting fault-current limiters operating at 77 K. IEEE Trans Power Delivery 1993; Vol 8 Issue 3: 1138-47

상세보기
M C Ahn, S Lee, H Kang, D K Bae, H SKim, T K Ko. Fabrication and Characteristic Test of the DC Reactor for 6.6kV/200A Inductive Superconducting Fault Current Limiter. Journal of the Korea Institute of Applied Superconductivity and Cryogenics 2003; 5(2): 36-40
H Kang, H J Kim, D K Bae, M C Ahn, H-M Chang, T K Ko. Sub-cooled nitrogen cryogenic cooling system for superconducting fault current limiter by using GM-cryocooler. Cryogenics 2005;45:65-69

상세보기
H Kang, H J Kim, D K Bae, M C Ahn, Y S Yoon, H-M Chang, T K Ko Characteristics of Sub-cooled Nitrogen Cryogenic System for Applied High- $T_c $ Superconducting Devices. Journal of the Korea Institute of Applied Superconductivity and Cryogenics 2004; 6(1): 38-42
M C Ahn, S Lee, H Kang, D K Bae, M Joo, H S Kim, T K Ko. Design, fabrication, and test of high- $T_c $ superconducting DC reactor for inductive superconducting fault current limiter. IEEE Trans Appl Superconduct 2004; Vol 14 Issue 2: 827-830

상세보기
D K Park, M C Ahn, S Park, H Kang, D K Bae, S E Yang, T K Ko. An Analysis and Short Circuit Test of Various Types of Bi-2223 Bifilar Winding Fault Current Limiting Module. 19th International Conference Magnet Technology

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DOI : 10.9714/psac.2006.8.2.029
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