A local diversion sealing method for air leakage of a gas-insulated metal-enclosed switch

Abstract

The invention provides a gas insulated metal-enclosed switchgear leakage local diversion blocking method. The method is characterized by, for a housing having a cylindrical turning geometrical characteristic, designing a special clamp; fixing the clamp onto the housing through an adhesive; blocking an air outlet through a bolt; and finally, blocking the air outlet position through the adhesive. The invention also provides a local blocking clamp size design calculating method. Compared with a conventional method of coating high-strength glue on the whole housing, the method greatly reduces construction cost, is short in construction period, has little effect on equipment body and is high in blocking success rate.

Description

technical field [0001] The invention relates to the field of insulating switches in electric power systems, and more specifically relates to a local diversion sealing method for gas leakage of gas-insulated metal-enclosed switches. Background technique [0002] Gas Insulated Switchgear (GIS) has been widely used in 110kV and above power grid systems because of its small footprint, compact structure, and easy maintenance. Due to casting, rolling, welding and other reasons, the housing of gas-insulated metal-enclosed switches often has pores and crack defects, resulting in air leakage of the equipment. SF 6 Gas leakage will bring the following hazards: 1. It requires inspection personnel to monitor and replenish gas, which increases the cost of inspection; 2. When the leakage is serious, it will cause equipment failure, resulting in power failure and other accidents; 3. SF 6 It is a strong greenhouse effect gas, which will cause environmental pollution. Therefore, using rea...

AI Technical Summary

Problems solved by technology

However, for the GIS equipment that has been installed on site and is in operation, due to the high temperature generated by repair welding, the insulation layer on the inner wall of the GIS shell will be burned, and the SF 6 Gas pyrolysis and other issues

Therefore, for the GIS equipment that has been installed and running, the method of repair welding cannot be used, and only power outage maintenance or high-strength polymer glue plugging technology can be used for processing.

[0004] The existing plugging technology has the following defects: 1. The patent application number CN201320578058.5 proposes a method for a drainage type magnetic plugging fixture, and the housing material needs to be a magnetic material. At present, most gas-insulated metal-enclosed switch housings are It is an aluminum alloy non-magnetic material, which is not suitable for this method

In addition, due to the strong permeability of SF6 molecules, the sealability of the joint interface in the plugging area is extremely high, and the rubber ring installation ring of the above patent is also difficult to achieve effective sealing.

2. The patent application number CN201810431205.3 proposes an injection method, which requires the design and manufacture of a bolted ring clamp with a large size and complex structure. As time goes by, the performance of the injection agent, especially the elasticity, will age. risk of re-spill

The method of sample impacting depends heavily on the operation level of the construction personnel, the sealing effect is poor, and the success rate of plugging is low. Once the defect is not handled properly, it may cause further expansion of the defect

For shell structures with rotary section features, it is difficult to achieve reliable sealing through mechanical compression methods such as clamps

Therefore, the above-mentioned patented technology is more applied to steel pipes or to slow down the gas leakage, but it is difficult to completely eliminate the gas leakage defect of the combined electrical SF6

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