126-kv cabinet type gas-insulated metal-closed switching equipment

Abstract

The invention discloses 126-kV cabinet type gas-insulated metal-closed switching equipment and solves the problems that: the 126-kV cabinet type gas-insulated metal-closed switching equipment in the prior art is large in size; final assembly and check are required in a user field; gas tightness is relatively difficult to guarantee; environmental pollution is easy to occur during switching on or off of an electric main loop by using a sulfur hexafluoride breaker; and pressure resistance capacity is relatively lower. The 126-kV cabinet type gas-insulated metal-closed switching equipment is characterized in that: six compartments have a square box shape formed by laser-cutting and laser-welding non-magnetic stainless steel plates which are 4 mm thick; sulfur hexafluoride gas of which the pressure is 0.1 to 0.2 MPa is filled into all compartments; all compartments realize insulating transition connection by using a disk type bus insulating sleeve component of which the diameter is smaller than 300 mm; a vacuum arc-distinguishing chamber polar column is arranged in a vacuum breaker compartment; and double-sheet splicing buses which realize communication of the main loop are arranged in the six compartments. The 126-kV cabinet type gas-insulated metal-closed switching equipment has the advantages of good gas tightness, high mechanical strength, low manufacturing cost and good environmental benefit, solves the insulating problem under the condition of low gas pressure and improves the operating safety of the equipment.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrical appliances, in particular to a 126kV cabinet-type gas-insulated metal-enclosed switchgear using a vacuum circuit breaker. Background technique [0002] In the prior art, the gas-insulated metal-enclosed switchgear of the 126kV high-voltage system is cylindrical, made of aluminum plate through argon arc welding, and has a large volume with a diameter of about 1000 mm. The opening and closing of the circuit, the arc extinguishing medium is sulfur hexafluoride gas, the gas pressure is generally 0.5~06MPa, this kind of large diameter aluminum cylinder is difficult to process and manufacture, the axial joint needs to be artificially welded by argon arc, and the airtightness is difficult Guarantee, it is easy to cause the leakage and discharge of sulfur hexafluoride gas due to welding quality problems, which will cause the reduction of the internal insulation of the equipment and even th...

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Problems solved by technology

[0002] In the prior art, the gas-insulated metal-enclosed switchgear of the 126kV high-voltage system is cylindrical, made of aluminum plate through argon arc welding, and has a large volume with a diameter of about 1000 mm. The opening and closing of the circuit, the arc extinguishing medium is sulfur hexafluoride gas, the gas pressure is generally 0.5~06MPa, this kind of large diameter aluminum cylinder is difficult to process and manufacture, the axial joint needs to be artificially welded by argon arc, and the airtightness is difficult Guarantee, it is easy to cause the leakage and discharge of sulfur hexafluoride gas due to welding quality problems, which will cause the reduction of the internal insulation of the equipment and even the breaking capacity, which will affect the safety of equipment operation; When opening and closing, sulfur hexafluoride will decompose under the action of arc thermal effect to produce toxic and harmful gas, and highly toxic dust will be generated under the participation of water molecules, causing environmental pollution. The distance between each compartment is about 700mm. The diameter of the pot insulator is used for insulation transition, the mechanical strength is weak, and the pressure resistance is also weak. Since the three-phase conductor is embedded in an insulator, the pot insulator will bear the insulation stress between phases and accelerate the aging of the insulating medium. Due to the large volume, the existing equipment needs to be final assembled and inspected at the user's site, and the environment at the user's site is poor. If sulfur hexafluoride gas is injected, the detection of gas sealing performance can only be qualitatively detected, that is, it can only detect whether there is air leakage, but not the gas leakage rate. The detection results are largely affected by the sensitivity of the detection equipment. limit

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