A mixed dielectric and medium or high voltage electrical equipment

Abstract

The invention relates to the technical field of the electrical equipment, and especially relates to a mixed dielectric and medium-voltage or high-voltage electrical equipment. The invention disclosesa mixed dielectric, and comprises perfluoroolefine and hydrofluoroolefin; carbon atom number of each of the perfluoroolefine and hydrofluoroolefin is three; the global warming potential of the perfluoroolefine and hydrofluoroolefin is lower than that of the hydrofluoroolefin; the mole percent MFO of the perfluoroolefine and hydrofluoroolefin is not less than 95% of the mole percent M determined bythe formula M=(PFO / PMixture)*100, wherein the Pmixture is the pressure of the mixed dielectric in the electrical equipment at 20 DEG C, and the PFO is equal to the saturated vapor pressure at the lowest operation temperature of the perfluoroolefine and hydrofluoroolefin at the electrical equipment at 20 DEG C. The mixed dielectric is low in GWP value and high in saturated vapor pressure and dielectric constant, the defect that the dielectric insulation / arc-extinguishing performance is limited since the saturated vapor pressure of single perfluoroolefine or hydrofluoroolefin is not high enoughis overcome.

Description

Technical field [0001] The present invention relates to the technical field of electrical equipment, and in particular to a mixed dielectric and medium-voltage or high-voltage electrical equipment. Background technique [0002] In medium-voltage or high-voltage electrical equipment, electrical insulation and possible arc extinguishing are usually achieved by gas enclosed in a housing in the equipment. Currently, the most commonly used gas is sulfur hexafluoride (SF 6 ), which has high dielectric strength, good thermal conductivity, and low dielectric loss, is non-toxic to humans and animals, and can quickly and almost completely recover itself after decomposition. However, SF 6 Has a global warming potential (GWP) of 22800 (relative to CO 2 ), the residence time in the atmosphere is 3200 years, is one of the strongest known greenhouse gases, and is listed as a gas that must be restricted by the United Nations Framework Convention on Climate Change. Best control SF 6 The method o...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a mixed dielectric and medium-voltage or high-voltage electrical equipment, which solves the problem that the saturated vapor pressure of the insulating dielectric of the existing electrical equipment is not high enough and the insulation capacity is limited

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