Mixed gas insulating medium

Abstract

The invention discloses a mixed gas insulating medium comprising the following components in percent by volume: 15-20 % of octafluorocyclobutane and 80-85% of nitrogen. The mixed gas insulating medium disclosed by the invention can serve as a new generation of gas insulating medium by replacing sulfur hexafluoride and can be widely applied to high-voltage power equipment, such as gas insulated transformers, gas insulated combined electrical appliances, gas insulated power transmission pipelines and the like.

Description

technical field [0001] The invention relates to a mixed gas insulating medium which can replace sulfur hexafluoride for high-voltage power equipment. Background technique [0002] SF 6 Gas has good insulation ability, arc extinguishing ability, chemical stability and non-toxicity, so it is widely used in gas-insulated equipment, such as gas-insulated transformers, gas-insulated circuit breakers, gas-insulated transmission pipelines, etc. However, pure SF 6 The gas is very sensitive to the inhomogeneity of the electric field and has high requirements for equipment processing; and SF 6 Discharge decomposition products of gases, such as SO 2 f 2 、SOF 2 , SF 4 , SF 2 、H 2 S. SOF 4 etc., are all highly toxic substances, which pose a great threat to personnel health; in addition, SF 6 The greenhouse effect of the gas is so large that its global warming potential (GWP) is about CO 2 23,900 times that of gas, and its lifetime in the atmosphere is about 3,200 years. Theref...

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Problems solved by technology

[0005] "A gas-insulated transformer" is disclosed in 02103455.9. This patent uses an inert gas with a global warming coefficient equal to or less than 1 as the insulating medium. Although the environmental protection effect is greatly improved, the insulation performance of the inert gas is much lower than that of SF 6 , which increases the volume of power equipment and increases production costs

[0006] In 200610084702.8, an "environmentally friendly gas-insulated combined electrical appliance" is disclosed. This patent uses dry low-pressure air as the insulating medium, which reduces the harm to the environment. However, due to the poor insulating ability of air, this patent is mainly suitable for applications below 12kV. electrical equipment

[0007] A "gas insulated electrical equipment" is disclosed in 200710001562.8, which uses CF with a volume ratio of more than 40% 3 I with other non-SF 6 The gas is mixed to form an insulating medium, which reduces the impact on the environment, but CF 3 I has poor stability and is easy to decompose, so it is necessary to increase the number of adsorbents and maintenance times, which increases the operating cost

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