GB/T 28819-2023Aluminium alloy enclosures for gas-filled high-voltage switchgear (English PDF)

1 Scope

This document specifies the normal and special conditions of use, materials, design, manufacturing and workmanship, and defects in aluminum alloy enclosures of high-voltage switchgear:

Repair, heat treatment of cast aluminum alloys, inspection, testing and quality assurance, pressure relief device requirements:

This document is applicable to outdoor or indoor installations filled with compressed dry air, sulfur hexafluoride, nitrogen, etc: or a mixture of these gases:

Design, production, inspection and testing of aluminum alloy casings for high-voltage switchgear:

Note: The above gases are mainly used for insulation and/or arc extinguishing, and the design pressure is usually greater than 0:3MPa (relative pressure):

The components contained in the aluminum alloy housing of inflatable high-voltage switchgear (including rigid gas insulated transmission lines) are not limited to the following element:

---breaker;

---Load switch;

---isolating switch;

---Grounding switch;

---Current Transformer;

---Voltage transformer;

---lightning arrester;

---Busbars and connectors:

It also includes pressure-bearing components, such as triple boxes (three-way) of switchgear with live casings:

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations

For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document:

GB/T 150 (all parts) Pressure vessels

GB/T 150:3-2011 Pressure vessels Part 3: Design

GB/T 228 (all parts) Tensile testing of metallic materials

GB/T 232-2010 Bending test method for metallic materials

GB/T 1173-2013 Cast aluminum alloy

GB/T 3246:1-2012 Structural examination methods for deformed aluminum and aluminum alloy products Part 1: Microstructure examination methods

GB/T 6519-2013 Ultrasonic inspection method for deformed aluminum and magnesium alloy products

GB/T 9438-2013 Aluminum alloy castings

GB/T 10858 Aluminum and aluminum alloy welding wire

GB/T 11022-2020 Common technical requirements for high-voltage AC switchgear and control equipment standards

GB/T 11346-2018 Defect classification for radiographic inspection of aluminum alloy castings

GB/T 12467 (all parts) Quality requirements for welding of metallic materials

GB/T 32563-2016 Non-destructive testing ultrasonic testing phased array ultrasonic testing method

GB/T 34630:3-2017 Friction stir welding of aluminum and aluminum alloys Part 3: Skill assessment of welding operators […]