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Breakdown characteristics of liquid nitrogen for transmission-class superconducting electric equipment

Authors
Shin, Woo juHwang, Jae-SangSeong, Jae kyuLee, Jong geonLee, Bang wook
Issue Date
Sep-2012
Publisher
IEEE
Keywords
Breakdown; Cryogenic Bushing; High Voltage; Liquind Nitrogen; Superconducting Equipment
Citation
Proceedings of 2012 IEEE International Conference on Condition Monitoring and Diagnosis, CMD 2012, pp.766 - 769
Indexed
OTHER
Journal Title
Proceedings of 2012 IEEE International Conference on Condition Monitoring and Diagnosis, CMD 2012
Start Page
766
End Page
769
URI
https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/36260
DOI
10.1109/CMD.2012.6416259
ISSN
0000-0000
Abstract
Since the discovery of high-temperature superconductor (HTS), liquid nitrogen(LN2) has not been only utilized as a coolant of superconducting electric equipment but also as an insulation material in cryogenic environment due to its dielectric performance. It also has a lot of advantages over other cryogenic liquid such as less expense and harmless substance, thus it has been widely used in the development of superconducting devices. Up to now, a lot of research works dealing with the breakdown characteristics of LN2 for distribution-class superconducting devices have been presented worldwide but, few research works about breakdown characteristics of liquid nitrogen in extra high voltage class have been reported due to the limitation of cryogenic test facilities in extra high voltage (EHV) class. In order to study the cryogenic EHV insulation technologies, we have built the cryogenic dielectric test facilities including a fiber reinforced plastic (FRP) big cryostat with cryogenic bushing, a 400 kV AC overvoltage and a 1.6 MV lightning impulse test systems. Using these facilities, we focused on the breakdown characteristics of liquid nitrogen in EHV level which is rather different comparing to the distribution level. With real scale big cryostat, AC overvoltage test and impulse tests have been performed. From the test results, the breakdown characteristics of liquid nitrogen in EHV were suggested. And these test results could be used as basic insulation design data to develop transmission-class superconducting electric equipment. © 2012 IEEE.
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ERICA 공학대학 (SCHOOL OF ELECTRICAL ENGINEERING)
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