On-line repairing method for weld defects of in-service GIS shell of transformer substation

A repair method and substation technology, applied in the electric power field, can solve problems such as uncontrollable air leakage, lack of SF6 gas, and reduce operation and maintenance costs, and achieve the effects of improving efficiency and economy, good fatigue resistance, and reducing corrosion effects.

CN113178805APending Publication Date: 2021-07-27ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-07-27

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Abstract

The invention discloses an on-line repairing method for weld defects of an in-service GIS shell of a transformer substation. The method comprises the following steps: detecting an SF6 gas pressure leakage alarm signal in the operation process of the GIS equipment, and finding a gas leakage area of the GIS shell on site; in the vicinity of the gas leakage area, measuring the direction and the size of the weld defect by using an ultrasonic flaw detector; carrying out finite element modeling, analysis and calculation on the GIS shell and then carrying out defect safety evaluation; marking welding seam defects, and performing groove treatment; filling the groove is filled with metal glue, and trimming the surface appearance to be consistent with the surface of the weld joint; and applying a reinforcing plate to the weld defects for reinforcing and repairing. According to the on-line repairing method, gas leakage defect treatment can be completed on the premise that equipment is not disassembled, normal operation of the equipment is not affected, and the efficiency and economical efficiency of gas leakage defect treatment are remarkably improved.
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Description

technical field

[0001] The invention belongs to the technical field of electric power and relates to a method for repairing an in-service GIS shell, in particular to an online repair method for weld defects of a GIS shell by using metal glue. Background technique

[0002] Gas Insulated Switchgear (GIS for short) has been widely used in the power industry because of its small footprint, compact structure, short installation period, high reliability, and long maintenance period. When GIS equipment is in use, it needs to fill the SF with a certain pressure (generally greater than 0.3MPa) inside the metal shell. 6 Gas is used as insulation and arc extinguishing medium, according to the maintenance requirements of power grid equipment, SF 6 The annual air leakage rate should be less than 1%.

[0003] However, during the operation of GIS equipment, due to the quality defects of the GIS metal shell and the influence of the operating environment, gas leakage often occurs, making t...

Examples

Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation.

[0061] Concrete implementation of the GIS shell surface mounted on the SF 6 Air pressure sensor, and GIS housing has SF 6 Infrared imaging leak detectors or laser imaging leak detectors, as well as portable digital ray detectors and ultrasonic flaw detectors.

[0062] The main body of the concrete GIS housing is a straight cylinder in the middle, symmetrical flanges are arranged at both ends of the straight cylinder, and there are girth welds and straight welds on the surface.

[0063] Such as figure 1 Shown, embodiment of the present invention and implementation thereof are as follows:

[0064] Defect location in step 1:

[0065] When the GIS equipment is running, a gas pressure sensor is installed in the inner cavity of the GIS shell, and the gas pressure sensor detects the air pressure, and then detects the SF 6 Whether the gas is le...