Electrical Insulation Characteristics of LN₂/CF₄ Mixture at Cryogenic Temperatures

Liquefied Natural Gas for Superconducting Energy Pipelines: A Feasibility Study on Electrical Insulation

“…Moreover, it is necessary to take the absolute value of the electric field strength to calculate Weibull parameters. Weibull scale parameters show that the breakdown field strength of LCH 4 /LC 2 H 6 and their binary mixtures is higher than the breakdown field strength of most LN 2 /LCF 4 binary mixtures under similar testing conditions . Moreover, the shape parameters show that the discharge uniformity of LCH 4 /LC 2 H 6 and their binary mixtures is far better than that of LN 2 /LCF 4 binary mixtures …”

“…Weibull scale parameters show that the breakdown field strength of LCH 4 /LC 2 H 6 and their binary mixtures is higher than the breakdown field strength of most LN 2 /LCF 4 binary mixtures under similar testing conditions. 5 Moreover, the shape parameters show that the discharge uniformity of LCH 4 /LC 2 H 6 and their binary mixtures is far better than that of LN 2 /LCF 4 binary mixtures. 5 Figure 4b shows that the Weibull scale parameters of all LNG are greater than 17 kV/mm, and the shape parameters show that the discharge uniformity of LC 2 H 6 is better than that of LCH 4 .…”

“…5 Moreover, the shape parameters show that the discharge uniformity of LCH 4 /LC 2 H 6 and their binary mixtures is far better than that of LN 2 /LCF 4 binary mixtures. 5 Figure 4b shows that the Weibull scale parameters of all LNG are greater than 17 kV/mm, and the shape parameters show that the discharge uniformity of LC 2 H 6 is better than that of LCH 4 . Moreover, the breakdown field strength fluctuates in a small range among different components of LNG, and the lowest breakdown field strength is about 70% of the highest breakdown field strength.…”

“…In the LN 2 / LCF 4 system, the minimum value of the average breakdown field strength is 14.1 kV/mm (LN 2 :LCF 4 = 2:3), and the maximum value is 28.3 kV/mm (pure LN 2 ). 5 Therefore, the average breakdown field strength of the LN 2 /LCF 4 system fluctuates greatly. Furthermore, hydrogen (about 400 parts per million) is detected by a GC, which is produced by the discharge decomposition of LNG (see Figure 4d).…”

“…Among the existing energy pipelines, the integration of superconducting transmission and LNG delivery has obvious advantages. ,− Figure b,c demonstrates two integrated superconducting energy pipelines. On the one hand, a normal operating superconductor has no heat generation below the critical temperature due to its zero resistance in a DC electric field, thus realizing the high-capacity power transmission. − On the other hand, LNG is one of the most widely used clean energy sources .…”