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Research on the power frequency breakdown characteristics of a new eco-friendly gas insulating medium HFO-1336mzz(E)

Recently, a new eco-friendly gas insulating medium HFO-1336mzz(E) (trans-1,1,1,4,4,4-hexafluoro-2-butene, chemical formula: C4H2F6) has entered the field of vision of researchers. HFO-1336mzz(E) has good environmental protection characteristics, high insulation strength, and is considered to be one of the powerful potential gases to replace SF6 in medium and low voltage equipment. This paper compares the insulation performance of HFO-1336mzz(E) gas mixture with CO2 and N2 as buffer gas, and finds that the effect of CO2 is better. Secondly, the quasi-uniform electric field was simulated by spherical electrode, and the breakdown voltage of HFO-1336mzz(E)/CO2 gas mixture under different gas pressure and mixing ratio was investigated. The results show that the breakdown voltage of the gas mixture with volume fraction 10%∼30% HFO-1336mzz(E)/CO2 increases linearly with the increase of gas pressure and mixing ratio. The breakdown voltages of 20%HFO-1336mzz(E) /CO2 mixture at 0.25MPa and 0.3MPa can reach 80% and 95.2% of that of pure SF6 at 0.1MPa respectively. Relevant research results show that HFO-1336mzz(E)/CO2 gas mixture has good insulation performance, which provides a reference for its engineering application.