A blocking technology of SF6 gas insulation power device leakage

Abstract

The plugging technology for SF6-insulation electric equipment comprises: adding nano powder of Al2O3 / 10 or SiO2 / 10 into polyurethane to mix with polyacrylate and form mixture (1) for coating on the surface of leakage (3); after partial drying and hardness up to 70+-5%, coating plugging material (2) on surface of (1); wherein, in material (1), the weight ratio of basis material, curing agent and nano powder is 1:1:0.1; in material (2), the weight ratio of basis material and curing agent is 1:1. This invention applies two-stage coating technology, overcomes defects in prior art, and has wide application.

Description

technical field [0001] The invention belongs to the use and maintenance technology of electrical equipment, in particular to a plugging technology adopted for the leakage state of SF6 gas-insulated power equipment. Background technique [0002] SF6 gas has strong insulating properties and is widely used in high-voltage electrical equipment. With the rapid development of China's national economy and the rapid advancement of science and technology, the application of SF6 gas high-voltage electrical appliances in power systems is very popular. In new construction or technical renovation projects, high-voltage circuit breakers or GIS switchgear are basically all using SF6 gas insulation. switch. [0003] Sulfur hexafluoride (SF6) gas is a synthetic substance with regular octahedral structure composed of one sulfur element and six fluorine elements. It is gaseous at normal temperature and pressure, colorless, odorless, non-toxic, non-odor, non-flammable, and its density is 5 ti...

AI Technical Summary

Problems solved by technology

Once SF6 leaks, the air enters the closed box, and under high pressure and close distance, the possibility of air breakdown increases, resulting in hidden dangers of accidents

[0008] (2) The loss of SF6 leakage, due to the extensive use of SF6, its price is also rising

[0009] (3) The gas leakage in the SF6 circuit breaker will cause a drop in the gas pressure in the circuit breaker, which will affect the normal operation of the circuit breaker. In severe cases, it will cause the circuit breaker to close and lock, threatening the safe operation of the system

[0010] (4) If gas leakage occurs in SF6 insulated power equipment, the moisture in the environment will penetrate from the outside to the inside, threatening the safe operation of the equipment

[0011] (5) During the long-term operation of power equipment, SF6 will produce some very toxic by-products due to the action of strong arc. These by-products may be discharged through the leakage site, affecting the health of power equipment maintenance personnel

[0018] In the prior art, a kind of Loctite 207 glue produced by Loctite Company has the sealing performance similar to that of glue, but as a plugging material, it needs to have higher mechanical strength, better resistance to electricity, moisture, temperature and other properties. Therefore, It is not appropriate to use it to block

[0019] At the same time, the leakage of SF6 gas is a gas with a certain pressure. The leaking equipment is sealed under pressure. It is difficult to use the current common plugging materials and conventional plugging methods, or the quality and effect of the plugging poor

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