SF6 Sulfur Hexafluoride Circuit Breaker Leakage Repair

YukeEGO Oil Surface Repair Kit, YukeEGG Repair Series,EGG Gas Leak Repair

SF6 gas is a colorless, odorless, non-toxic, non-flammable, and transparent gas. Under normal conditions, it may liquefy and can only remain in a gaseous state above45 degrees Celsius. In a uniform electric field, its insulation capacity is3 times that of air, and at4 atmospheres, its insulation capacity is equivalent to transformer oil.

At room temperature, it is an inert gas and generally does not react with other materials.

It has excellent insulation properties and unique thermal and electrical characteristics.SF6 gas is an electronegative gas, and its molecules and atoms have a strong ability to adsorb free electrons, allowing them to adsorb a large number of free electrons in the arc gap, forming negative ions. Negative ions move much slower than free electrons and easily recombine with positive ions to form neutral molecules and atoms, significantly accelerating the recovery of the dielectric strength of the arc gap when the current crosses zero.

 SF6 circuit breakers can be divided into single-phase operating type and three-phase linkage typeSF6 circuit breakers.

  Based on structural design, they are further classified into porcelain column circuit breakers and tank-type circuit breakers (GIS).

  SF6 leakage hazards:1)SF6 gas, although colorless, odorless, and non-toxic, is a heavy inert gas that often accumulates in low-lying areas, causing the covered areas to be isolated from air, resulting in oxygen deficiency. It can easily pollute the environment and is difficult to remove. In workplaces, when the concentration of SF6 gas leakage in the air exceeds a certain level, harmful decomposition products may pose risks to human health.
decomposition components may harm human health.
(2)SF6 electrical equipment leakage leads toSF6 gas loss, reduced gas purity, and increased impurities such as water, acid, and hydrolyzable substances, resulting in degraded or even unqualified dielectric quality. Leakage also causes waste and increases operational and maintenance workloads.
(3)SF6 gas's dielectric strength is highly dependent on gas pressure.Only by maintaining the pressure within the design-specified range and avoiding leakage can electrical equipment achieve or maintain the designed insulation level during operation.

  Traditional leak repair methods typically involve using mechanical clamps with internal injection of sealant, utilizing high pressure to seal the gas. This repair method is often quick and pressure-insensitive, but the repair effect rarely lasts more than3 months. The main reasons are fatigue deformation of the clamp, ineffective bonding of the sealant to the substrate (only relying on external pressure on the surface), and thermal expansion and contraction, which can lead to secondary leakage in a very short time. In the case of ordinary gases, secondary leakage is not very severe and often does not affect equipment operation. However, leakage inSF6 circuit breakers often hides significant safety risks, making it essential to ensure the quality and effectiveness of the repair.

Qingdao Yuke New Materials Co., Ltd. has many years of experience in SF6 leak sealing and has extensive construction experience with commonSF6 circuit breaker issues such as flange joint surfaceSF6 leakage, pinhole leakageSF6, bolt joint surface leakageSF6, porcelain insulator leakageSF6, and insulating disk SF6 leakage. Based on years of experience, the company has developed theEGG repair kit series products, which can tailor comprehensive construction processes according to different leakage points. The repair process causes no damage or changes to the equipment, requires no shutdown or pressure release, and can be performed during operation, making it quick and convenient. After repair, long-term sealing effects can be achieved, with a service life of over10 years. The company has successfully served numerous ultra-high voltage substations and major power enterprises domestically and internationally, proving it to be an effectiveSF6 leak repair technology.