Design of 154 kV Extra-High-Voltage Prototype SF<sub>6</sub> Bushing for Superconducting Electric Power Applications

Koo, Ja-Yoon; Seong, Joon‐Kyung; Hwang, Jeoung‐Yeon; Lee, Bang-Wook; Lee, Sang-Hwa

doi:10.1143/jjap.51.09me01

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2022

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“…A dry type bushing was selected for cryogenic application in order to avoid freezing or liquefaction of the fluid [13]. The paper free RIS bushing type was described as less hygroscopic than the RIP type, which is an advantage in case of long term operation under cryogenic conditions with expected humidity caused by condensation on the surface.…”

Section: Discussionmentioning

confidence: 99%

Cryogenic testing of a 25 kV RIS bushing

Fink¹,

Fuhrmann²,

Zwecker³

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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High voltage bushings for cryogenic current or voltage leads must master safely the special thermal stress in addition to the high voltage requirements. Resin impregnated synthetic (RIS) bushings have proven their usability for room temperature high voltage application since few years. Such paper free bushings are less hygroscopic than paper based bushings, which can be an advantage for components exposed to cryogenic temperatures on one side and to air conditions on the other. A conventional 25 kV, 2 kA room temperature RIS bushing was assembled to an open bath cryostat and subjected to five thermal cycles. High voltage tests were successfully performed under cryogenic conditions. No degradation of the bushing was found after the thermo-mechanical stress of the fast cool downs and one fast warm up. This paper focuses on the thermal tests.

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Section: Discussionmentioning

confidence: 99%