Experimental Study on Barrier Effects in Gaseous Nitrogen for the Development of a High-Voltage Superconducting Apparatus
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A subcooled liquid nitrogen cooling system is known as the most promising method for developing a high-voltage superconducting apparatus, such as a superconducting fault current limiter, a superconducting transformer, and so on (Kang et al, IEEE Trans. Appl. Supercond. 18, (2), 628-631 2008). Gaseous nitrogen is injected into a superconducting magnet system to control the pressure and enhance the dielectric characteristics of a subcooled liquid nitrogen cooling system. In this case, the application of a solid insulating barrier between electrodes is regarded as an effective method to enhance the insufficient dielectric characteristics of gaseous nitrogen to develop a transmission superconducting apparatus. Dielectric experiments for a solid insulating barrier made of glass fiber-reinforced plastics (GFRP) in gaseous nitrogen are conducted under various pressures (0.1 ∼ 0.4 MPa), and the results are analyzed. A solid insulating barrier is installed between a rod to plane electrode system. The AC electrical breakdown characteristics according to the pressure of gaseous nitrogen and the position of a barrier between two electrodes are observed.
KeywordsBarrier effect Electrical breakdown Gas insulation High-voltage superconducting fault current limiter Subcooled liquid nitrogen
This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by Korea government Ministry of Trade, Industry and Energy (No. 20131020401020)
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