A new method of plugging leakage under pressure for gis equipment

Abstract

The invention relates to a novel pressured leakage stopping method for GIS equipment. The method comprises steps that a cleaning kit is utilized to clean a surface near a leakage portion of the GIS equipment; a special leakage stopping device is utilized at the leakage portion, a locking base is disposed at a leakage point, the leakage point is disposed in an air vent of the locking base, then, the locking base is bonded to a surface of the leakage point of the GIS equipment by utilizing leakage stopping glue, after the leakage stopping portion is pressed for 5-6 minutes, after the leakage stopping glue is initially cured, the locking base is fixed with structural glue; after the structural glue is fixed, a locking buckle equipped with a sealing member is fastened to the locking base; a layer of structural glue is applied on surfaces and periphery of the locking buckle, the locking base and the sealing member to structurally reinforce the leakage stopping portion; according to the shape of the leakage stopping portion, the sealing glue is coated on a surface of the leakage stopping portion for appearance beautifying. The method is advantaged in that the method has properties of wide application scope and high success rate, and secondary leakage is effectively prevented.

Description

technical field [0001] The invention relates to the field of leak plugging of GIS equipment, in particular to a novel pressurized leak plugging method of GIS equipment. Background technique [0002] SF6 gas has excellent arc extinguishing performance, insulation performance and good chemical stability. It has been used as an arc extinguishing medium for high-voltage circuit breakers since the late 1950s. In EHV and UHV circuit breakers, SF6 has replaced oil as an arc extinguishing medium, and has largely replaced compressed air. [0003] SF6 gas-insulated fully enclosed switchgear occupies a much smaller area than conventional open high-voltage power distribution devices, and its operation is not affected by external weather and environmental conditions, so it is not only widely used in ultra-high voltage and ultra-high voltage power systems, And it has begun to be used in power distribution network (SF6 gas insulated switchgear and ring network power supply unit). SF6 gas...

AI Technical Summary

Problems solved by technology

(1) SF6 can be decomposed into toxic substances such as hydrogen fluoride, sulfur dioxide, and sulfur tetrafluoride under high temperature or arc action. The leakage of SF6 will pollute the environment and endanger the health of personnel

(2) GIS air leakage will cause moisture to enter the GIS gas chamber, resulting in an increase in the SF6 moisture content in the gas chamber, a decrease in electrical insulation performance and arc extinguishing performance, and affecting the safe operation of the equipment

(3) GIS leakage reduces the gas pressure in the closed gas chamber, reduces the insulation performance and arc extinguishing performance of the gas chamber, and even causes the gas density relay to alarm, thus causing a large-scale power outage

(4) SF6 gas is expensive, and gas leakage will increase maintenance costs and operating costs

[0005] At present, the methods of plugging the leakage in the power system mainly include: (1) Replacement of the seals. Although this method is highly feasible, it needs to cut off the power and release the pressure of the equipment, which will affect the normal operation of the power system.

(2) High-frequency impact or twisting method, by hitting around the leak point to deform the metal, and the deformation gradually accumulates, so as to achieve the purpose of plugging, but this method is only for the trachoma part with low air leakage pressure

(3) Fixture glue injection method, by installing a special fixture on the leaking part to build a sealed space, using an injection gun to inject sealant to create a new sealed space, but the scope of application of this method is small, and the special fixture can only be used for pipeline plugging

(4) Bonding method, using adhesive to plug the surface of the leak point, but it takes a certain amount of time for the adhesive to cure, and the leakage pressure will "blow out" the leaking part, and the success rate is low

The above-mentioned methods have the defects of long plugging time, small plugging range and low plugging success rate, and cannot be applied to gas leaks with different defects.

[0006] Invention patents "A Method for Plugging Gas Leakage of GIS Equipment with Charge and Pressure" (publication number: CN105811280A) and "A Device for Plugging Gas Leakage with Charge and Pressure of GIS Equipment" (publication number: CN105932578A) disclose a ring-shaped bag The Ω-shaped rubber strip covering both sides of the leaking position of the GIS equipment and the cut-off valve connected with the rubber strip: this device and method can plug the flange, but it is only suitable for flanges that are connected to pipes on both sides and the outer diameter of the flange is small device of

Although the above method is feasible, the bolts of the flange need to be disassembled when plugging the leakage, which may cause secondary leakage

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