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137 results on '"Lim, Sung-Hun"'

21. Current limiting characteristics of flux-lock type high-Tc superconducting fault current limiter with control circuit for magnetic field

Author

Lim, Sung-Hun, Kang, Hyeong-Gon, Choi, Hyo-Sang, Lee, Seong-Ryong, and Han, Byoung-Sung

Subjects
Superconductive devices -- Research, Superconducting magnets -- Research, Superconductors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A flux-lock high temperature superconducting fault current limiter (HTSC-FCL) is described and discussed.

Published
2003

30. Magnetization and Power Losses Characteristics Due to Variation in the Number of Windings of a Bridge Type SFCL With Double HTSC Elements.

Author

Ko, Seok-Cheol, Han, Tae-Hee, and Lim, Sung-Hun

Subjects
SUPERCONDUCTING fault current limiters, MAGNETIZATION, MAGNETIC flux, MAGNETIC levitation vehicles, FAULT currents
Abstract

Superconducting fault current limiters (SFCLs) are emerging as an alternative to limit fault current in AC and DC power systems. SFCLs can perform faster current limiting operation and automatic fault current detection and recovery, regardless of the type of fault. In this paper, a laboratory-scale prototype SFCL was fabricated and analyzed for its magnetization characteristics due to the magnetizing current according to the change of the number of windings in pairs. This bridge type SFCL consists of two windings and two high-Tc superconducting (HTSC) elements on one iron core. When the number of windings of the two coils were changed in pairs, the variation of the induced voltage and Joule losses due to the magnetizing current, magnetic flux in each winding, and power losses for the bridge type SFCL were compared with each other. Through comparative analysis, it was confirmed that the size of the number of turns should be considered to reduce the power losses of SFCL while effectively limiting the fault current during the fault cycle. [ABSTRACT FROM AUTHOR]

Published
2021
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40. Analysis on Current Distribution in Multi-layer HTSC Power Cable with Shield Layer

Author

Yim Seong-Woo, Han Byoung-Sung, Du Ho-Ik, Lee Jong-Hwa, and Lim Sung-Hun

Subjects
Superconductivity, Materials science, business.industry, Contact resistance, Electrical engineering, law.invention, law, Condensed Matter::Superconductivity, Shield, Shielded cable, Equivalent circuit, Optoelectronics, Power cable, Current (fluid), business, Layer (electronics)
Abstract

High- superconducting (HTSC) power cable is one of the interesting parts in power application using HTSC wire. However, its stacked structure makes the current distribution between conducting layers non-uniform due to difference between self inductances of conducting layers and mutual inductances between two conducting layers, which results in lower current transmission capacity of HTSC power cable. In this paper, the transport current distribution between conducting layers was investigated through the numerical analysis for the equivalent circuit of HTSC power cable with a shield layer, and compared with the case of without a shield layer. The transport current distribution due to the increase of the contact resistance in each layer was improved. However, its magnetization loss increased as the contact resistance increased. It was confirmed from the analysis that the shield layer was contributed to the improvement of the current distribution between conducting layers if the winding direction and the pitch length were properly chosen.

Published
2006

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