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In this article, an experimental study was carried out on the switching impulse (SI) breakdown characteristics of C5F10O/CO2 mixture, and the effects of pressure and mixing ratio on its breakdown characteristics were analyzed. The results show that there is a polarity effect between positive and negative breakdown voltages, and the polarity effect becomes stronger with the pressure increased, and a polarity reversal occurred at 0.15 MPa. Increasing the gas pressure and the content of C5F10O can improve the SI breakdown voltage of C5F10O/CO2, but it can only reach 60%–70% of SF6 under the same conditions. The positive breakdown voltage has a “hump” phenomenon as the pressure increases. With the increase in C5F10O content, the “hump” tends to shift toward low pressure. The “hump” is explained from the improving effect of positive space charge on electric field, and the influence of the applied voltage, pressure, and C5F10O content on the positive charge layer is comprehensively considered. The results of this article can provide reference for the engineering application of C5F10O gas insulating medium. [ABSTRACT FROM AUTHOR]

The Junggar Basin is one of the main oil basins in Northwest China, and the north‐west part of the basin is a significant petroleum exploration target. Mesozoic structural activity had an important influence on the present structural characteristics of the north‐west Junggar Basin. In this paper, we discuss the tectonic evolution of the Junggar Basin by studying the structural characteristics of the Ke‐Bai Fault. Our results suggest that the Ke‐Bai Fault has obvious strike‐slip characteristics and that it is an important basin‐controlling fault that has controlled the tectonic evolution of the north‐west Junggar Basin. The Junggar Basin was a rift basin in the Early Permian, but it experienced a tectonic reversal during the Middle Permian to the Triassic. The Ke‐Bai Fault changed from a normal fault into a thrust fault from the Early Permian to the Triassic. During the Jurassic, dextral strike‐slip structures developed along the Ke‐Bai Fault, horsetail splay faults developed in its north segment, and there is evidence that it was under WNW–ESE compression. The dextral strike‐slip faulting of the Ke‐Bai Fault is consistent with tectonic movement along the Kelameili, Sangequan, Wu‐Xia, Hong‐Che, and North Tianshan fault systems in the Junggar Basin. We therefore infer that counterclockwise rotation occurred in the Junggar Basin in the Jurassic. [ABSTRACT FROM AUTHOR]