Tank body and the arc extinguishing chamber and high-voltage switchgear using the tank body

Abstract

The invention discloses a tank and an arc extinguish chamber and a high-voltage switch gear using the tank. A solid insulation sleeve is arranged between a gas outgoing portion of the blowout side of the arc extinguish chamber and the inner wall face of a tank body in a partitioned manner, and the inner wall face of the solid insulation sleeve is a baffle surface used for baffling insulating gas ejected from the blowout side to enable the ejected insulating gas to be baffled for reversed. During use, the insulating gas ejected from a nozzle of a movable power connecting end performs arc extinguishing on high-voltage arc in a fracture and is ejected from the blowout side on the movable power connecting end and / or static power connecting end, the insulating gas is still higher in flow rate and temperature and is mixed up with some metal dust and ionization decomposition objects, mixed gas high in temperature and flow rate crashes on the baffle surface where the solid insulation sleeve is fixed, the baffle surface plays a role in restraining the mixed gas with strong wind strength, energy of the mixed gas can be released under the action of crash, and accordingly, impact erosion of the mixed gas ejected from the blowout side on the inner wall face of the tank body is avoided.

Description

technical field [0001] The invention relates to a tank body, an arc extinguishing chamber using the tank body, and a high-voltage switchgear. Background technique [0002] At present, the commonly used insulation methods in switchgear are divided into gas insulation and fixed insulation. The method of gas insulation is to fill sulfur hexafluoride gas, nitrogen, etc. Vinyl fluoride, electric ceramic materials, glass fiber cloth, resin materials, etc., and the gas insulation method is generally used in the ground insulation of metal-enclosed switchgear, and its advantage is that the form of the gas is not fixed, especially the switch that uses gas blowing to extinguish the arc. Equipment, gas insulation is to play the role of arc extinguishing. However, no matter whether sulfur hexafluoride gas or nitrogen is used for gas insulation, its insulation strength is lower than that of fixed insulation materials in fixed insulation, and the insulation performance of insulating gas w...

AI Technical Summary

Problems solved by technology

However, because the high-temperature arc between the dynamic and static connection ends will heat the insulating gas, the pressure of the insulating gas will increase and the insulation capacity will decrease. However, the dynamic connection end of the arc extinguishing chamber uses mechanical means to create a pressure difference or uses the pressure difference of the arc extinguishing chamber itself The arc is extinguished, and the high-temperature insulating gas is blown to the static terminal of the arc extinguishing chamber for cooling. Therefore, during the cooling process of the high-temperature insulating gas, the gas will ablate the components of the static terminal of the arc extinguishing chamber to A certain amount of metal dust and ionized decomposition products are produced in the airflow channel of the electric terminal. This part of the dust and decomposition products and the insulating gas that has not been completely cooled will be directly sprayed from the air outlet side of the static terminal to the inner wall of the tank. , the dust and decomposition products mixed in the insulating gas will burn and erode the tank wall of the tank body, resulting in uneven inner wall surface of the tank body, which will cause breakdown or discharge of the arc extinguishing chamber to the ground, so the gas-insulated metal-enclosed switch The equipment usually needs to reduce the temperature of the insulating gas by extending the airflow channel at the static end of the arc extinguishing chamber

[0004] However, if the air flow channel is to be extended in a limited space, baffles can only be added to the cooling channel in the static terminal of the arc extinguishing chamber, but the effect of the baffles is also limited. When the gas-insulated metal-enclosed switchgear When the inner diameter of the tank shrinks to a certain extent, the insulation to the ground will become very sensitive. As long as there is a slight decrease in the insulation performance, it will cause discharge or breakdown to the ground. Performance will have little impact

[0005] With the progress of society and the increase of population density, the requirements of modern society for the utilization of space are also increasing, so that the market demand for the reduction of the size of metal-enclosed switchgear is getting higher and higher, such as the requirements of power grid bidding Among them, the width of 252kV three-phase split-phase metal-enclosed switchgear has been reduced from the original 2300mm to 1500mm, such as a circuit breaker with sulfur hexafluoride gas as the insulating medium. The tank diameter has been reduced to a limit. If the tank diameter is further reduced, the only way to increase the pressure of the insulating gas in the tank is, but this method not only wastes gas, but also has an impact on the safety of metal-enclosed switchgear. After all, increasing the design pressure, Not only does it add to the cost of materials, but it also requires a higher level of professional qualification

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