Medium-voltage switchgear using trifluoroiodomethane and its mixtures as insulating medium

A trifluoroiodomethane and switchgear technology, which is applied in the setting of switchgear, switchgear, electrical components, etc., can solve the problems of environmental hazards, large use limitations, and inability to achieve pure SF6 insulation performance, etc. Adaptability issues, environmental performance improvement, and the effect of ensuring safety

Active Publication Date: 2018-08-24
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sulfur hexafluoride (SF6) is a widely used electrical insulating gas with many advantages, but due to its significant greenhouse effect and its very high global warming potential (GWP), it has been Listed as a restricted greenhouse gas by the "Kyoto Protocol", which has a huge impact on the use prospects and costs of SF6
Using SF6 mixed gas as an insulating medium is a way to directly reduce the use of SF6 gas and reduce environmental impact, but there is still no way to fundamentally solve the dependence of electrical insulation on SF6, and its harm to the environment will also be accumulated through continuous accumulation. make an impact
[0005] Use high-pressure buffer gas, such as compressed air, compressed nitrogen (N2), etc., due to the difference between gas properties and SF6, neither air nor nitrogen can achieve the insulation performance of pure SF6, and the use is very limited, which cannot meet the needs of the electrical industry.

Method used

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  • Medium-voltage switchgear using trifluoroiodomethane and its mixtures as insulating medium
  • Medium-voltage switchgear using trifluoroiodomethane and its mixtures as insulating medium

Examples

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Embodiment 1

[0045] The lowest ambient temperature for indoor medium-voltage switchgear is -20°C, while the liquefaction temperature of trifluoroiodomethane is -22.5°C. At this time, if the inflation pressure in the medium voltage switchgear is 0.1 MPa, the content of trifluoroiodomethane can reach 100%, that is, pure trifluoroiodomethane gas can be filled in the sealed box shell 1 . The dielectric strength of this gas is about 1.2 times that of the traditional insulating gas sulfur hexafluoride.

[0046] Taking the ball-plate electrode model as an example, such as figure 2 As shown, the breakdown voltage of 0.1MPa sulfur hexafluoride insulating gas is 100kV when the gap is 20mm, and if pure trifluoroiodomethane gas is used as the insulating medium, the breakdown voltage is about 120kV; that is, pure hexafluoride The dielectric strength of sulfur sulfide under the ball-plate electrode model is about 5kV / mm, while that of pure trifluoroiodomethane is about 6kV / mm.

[0047] In addition, i...

Embodiment 2

[0050] For indoor medium-voltage switchgear, the lowest temperature of the environment is lower than -20°C, and the liquefaction temperature of trifluoroiodomethane is -22.5°C, so it is necessary to use a mixed gas as an insulating medium. Considering the cost factor, reducing the content of trifluoroiodomethane, the main insulating component, should be helpful to the product.

[0051] For medium-voltage switchgear with a voltage level of 12kV, the key insulation structure design of its traditional sulfur hexafluoride insulation products is that the minimum phase-to-phase and ground clearances are not less than 30mm, and the fracture opening distance is 60mm. Under this condition, the power frequency overvoltage is 42kV / 48kV for 1 minute, and the lightning impulse overvoltage is 75kV / 85kV. The mixing ratio of trifluoroiodomethane is about 8% to 10%, and the auxiliary gas includes dry air, nitrogen, carbon dioxide, helium, argon, oxygen and other gases, which can pass the asses...

Embodiment 3

[0053] For medium-voltage switchgear with a voltage level of 24kV, the minimum gap of the traditional sulfur hexafluoride insulation product is about 30mm, and the opening distance of the fracture is 75mm. Under this condition, the power frequency overvoltage is 65kV / 79kV for 1 minute, and the lightning impulse overvoltage is 125kV / 145kV. The mixing ratio of trifluoroiodomethane is about 10% to 20%, and the auxiliary gas includes dry air, nitrogen, carbon dioxide, helium, argon, oxygen and other gases, which can pass the assessment under the above voltage conditions; The gas liquefaction temperature is about -55°C, which can fully meet the outdoor low temperature -40°C environment requirements.

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Abstract

The invention discloses a medium-voltage switchgear by employing trifluoroiodomethane and a mixture thereof as an insulating medium. The medium-voltage switchgear comprises a sealing box body shell provided with an electrical assembly at the inside and a dry insulating medium inflated in the sealing box body shell, and the inflation pressure of the insulating medium is 0.1 MPa-0.3 Mpa; the sealing box body shell is manufactured by laser welding of metal sheet parts, and the metal sheet parts comprise demagnetization stainless steel materials with types of 309, 310, 314 or 330; when the operating environment in which the medium-voltage switchgear is located is higher than or equal to -20 DEG C, the insulating medium is trifluoroiodomethane; and when the operating environment in which the medium-voltage switchgear is located is lower than -20 DEG C, the insulating medium is the mixture of trifluoroiodomethane and auxiliary gas, wherein the mixed volume ratio of the trifluoroiodomethane is lower than 40%, and the mixed volume ratio of the auxiliary gas is higher than 60%. The beneficial effects of the medium-voltage switchgear are that good insulation is realized, and the environmental performance is greatly improved.

Description

technical field [0001] The invention relates to a medium-voltage switchgear, in particular to a medium-voltage switchgear using trifluoroiodomethane and its mixture as an insulating medium, and belongs to the technical field of switchgear. Background technique [0002] Medium voltage refers to alternating current with a voltage level above 1kV (kilovolt) and below 126kV, and direct current between 1.5kV and below 75kV. The high voltage refers to the alternating current not lower than 126kV and the direct current not lower than 75kV. [0003] Sulfur hexafluoride (SF6) is a widely used electrical insulating gas with many advantages, but due to its significant greenhouse effect and its very high global warming potential (GWP), it has been It is listed as a restricted greenhouse gas by the "Kyoto Protocol", which has a huge impact on the use prospect and cost of SF6. Therefore, a new type of environmentally friendly insulating gas is needed to replace SF6 and be used in the fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02B13/055
CPCH02B13/055
Inventor 周柏杰蔡凡一薛健赵晓冬韩冬肖登明
Owner STATE GRID CORP OF CHINA
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