Abstract
The greenhouse effect of SF6 has made its application in various types of gas-insulated equipment increasingly restricted. C6F12O combines the advantages of insulation strength, safety and environmental friendliness and is considered to have potential for use in medium and low voltage equipment when mixed with buffer gas. In this paper, an experimental study on the partial discharge characteristics of C6F12O/CO2 mixed gas was carried out. The partial discharge initial voltage and the partial discharge extinction voltage of the mixed gas under the power frequency voltage are measured, and compared with the breakdown voltage. It was found that the partial discharge initiation voltage and the extinction voltage of the mixed gas gradually increased with the mixing ratio, and the influence of the gas pressure on the high mixing ratio was large. Compared with pure CO2, the difference between the partial discharge starting voltage and the breakdown voltage of the mixed gas is large. The research in this paper can provide guidance for the operation and maintenance of C6F12O mixed gas in the application of medium and low voltage equipment.
Highlights
SF6 is required to gradually limit its use worldwide due to environmental issues
The positive and negative half-cycle partial discharge inception voltage (PDIV) are distinguished by PDIV+ and PDIV, respectively, and the positive and negative half-week partial discharge extinction voltage (PDEV) are distinguished by PDEV+ and PDEV
When the gas pressure is less than 0.14 MPa, the change of the mixing ratio has little effect on the PDIV, so at a lower pressure, increasing the mixing ratio does not significantly improve the partial discharge characteristics of the mixed gas
Summary
SF6 is required to gradually limit its use worldwide due to environmental issues. The proportion of SF6 used in medium and low voltage equipment accounts for about 10% of the total electricity consumption. attention to the replacement of SF6 in medium and low voltage equipment is an important part of limiting its use. The environmentally friendly gas used in medium and low voltage equipment is mainly natural gas. C6F12O is a kind of material with excellent insulation performance Previous studies have found that 3% C6F12O/N2 mixed gas at atmospheric pressure is 1.7 times the pure N2 breakdown voltage, which is equivalent to the breakdown voltage of 10% SF6/N2 mixed gas. The decomposition products of the mixed gas after breakdown are analyzed to obtain fluorocarbons such as CF4, C2F6, C3F6.12,13 Referring to Table I, considering the GWP, cost and toxicity, C6F12O is a good choice. Previous studies have shown that C6F12O/CO2 mixed gas with a gas pressure greater than 0.14 MPa and a mixing ratio greater than 4% has the potential to be used in 10kV switchgear and passed the factory withstand voltage test and type test.. The difference between the positive and negative half cycles of the AC voltage and the mixing ratio and the pressure value are analyzed
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