NDLI: Design, Fabrication, and Operation of the Cryogenic System for a 220 kV/300 MVA Saturated Iron-Core Superconducting Fault Current Limiter

Content Provider	IEEE Xplore Digital Library
Author	Hong, H. Su, B. Niu, G.J. Cui, J.B. Tian, B. Li, Q. Wang, L.Z. Wang, Z.H. Zhang, K. Xin, Y.
Copyright Year	2002
Abstract	High reliability is one of the key requirements for a power grid device. The reliability of a superconducting fault current limiter (SFCL) largely depends on the reliability of its cryogenic system. An open cryogenic system was designed and fabricated for a 220 kV/300 MVA saturated iron-core SFCL, which was composed of a Dewar, heat insulation pipelines, a liquid nitrogen tank, a control circuit, and a vacuum pump. In its configuration, a high-temperature superconducting (HTS) dc bias coil is immersed with liquid nitrogen inside the Dewar. The control circuit constantly monitors the liquid nitrogen level and controls the supply of liquid nitrogen in accordance with the liquid nitrogen level. Nitrogen vapor is directly released into the environment. The SFCL including the cryogenic system was installed in the Shigezhuang substation of Tianjin, China. There are three operation modes for the cryogenic system. The first is the ac coil and the HTS coil being loaded with current. The second is the HTS coil being loaded with current, while no current in the ac coil. The last mode is no current loading in both the coils. Operation data of the cryogenic system are analyzed to compare thermal load, pressure, and supply cycle of liquid nitrogen in the three operation modes.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	4
Page Count	4
File Size	756761
File Format	PDF
ISSN	10518223
Volume Number	24
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cryogenics Insulation Coils Nitrogen Liquids High-temperature superconductors Heating superconducting fault current limiter (SFCL) Cryogenic system heat loss liquid nitrogen cooling
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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