This European Standard applies to cast aluminium alloy enclosures pressurized with dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases, used in indoor or outdoor installations of high-voltage switchgear and controlgear above 1 kV, where the gas is used principally for its dielectric and\/or arc-quenching properties with rated voltages<\/p>\n
above 1 kV and up to and including 52 kV and with gas-filled enclosures with design pressure higher than 300 kPa relative pressure (gauge);<\/p>\n<\/li>\n
and with rated voltage above 52 kV.<\/p>\n<\/li>\n<\/ul>\n
The enclosures comprise parts of electrical equipment not necessarily limited to the following examples:<\/p>\n
Circuit-breakers<\/p>\n<\/li>\n
Switch-disconnectors<\/p>\n<\/li>\n
Disconnectors<\/p>\n<\/li>\n
Earthing switches<\/p>\n<\/li>\n
Current transformers<\/p>\n<\/li>\n
Voltage transformers<\/p>\n<\/li>\n
Surge arrestors<\/p>\n<\/li>\n
Busbars and connections<\/p>\n<\/li>\n
etc.<\/p>\n<\/li>\n<\/ul>\n
The scope also covers enclosures of pressurized components such as the centre chamber of live tank switchgear, gas-insulated current transformers, etc.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | Contents Page <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | European foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 General 1.1 Scope 1.2 Normative references <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1.3 Quality assurance 2 Normal and special service conditions 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4 Materials 4.1 Selection of material Table 1 \u2014 List of recommended cast aluminium alloys [1] <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.2 Chemical analysis 5 Design 5.1 General <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5.2 Calculation Methods 5.2.1 General 5.2.2 Evaluation of mechanical strength using \u201cDesign by Formula\u201d 5.2.3 Evaluation of mechanical strength using \u201cDesign by Analysis\u201d 5.2.3.1 Normal loads <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.2.3.2 Exceptional loads 5.2.4 Flanges <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.2.5 Bolted connections 5.3 Inspection and access openings 6 Manufacture and workmanship 6.1 Manufacture 6.2 Consultation between manufacturer and founder 6.3 Foundry technique <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 6.4 Geometry and dimensions 6.5 Chemical composition and mechanical properties 6.5.1 Sampling 6.5.2 Chemical composition 6.5.3 Mechanical properties 6.6 Workmanship 6.6.1 Surface finish 6.6.2 Soundness <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 7 Repair of casting defects 7.1 General 7.2 Repair by welding 7.2.1 Welding performance test 7.2.2 Weld procedure 7.2.3 Weld procedure test <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 7.2.4 Application to castings Table 2 \u2014 Permissible oxide inclusions Table 3 \u2014 Permissible tungsten inclusions 7.2.5 Preparation of castings for weld repairs <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 7.2.6 Inspection of weld repair areas 7.3 Impregnation of castings 8 Thermal treatment 8.1 Thermal treatment procedure 8.2 Methods of heating 8.3 Quenching 8.4 Calibration of furnace temperature 8.5 Thermal treatment charts <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 9 Inspection, testing and certification 9.1 Type tests 9.1.1 General 9.1.2 Burst test procedure 9.1.3 Strain measurement test <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 9.2 Inspection and routine tests 9.2.1 General 9.2.2 Visual inspection 9.2.3 Dye penetrant examination 9.2.4 Radiographic examination 9.2.5 Ultrasonic examination <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 9.2.6 Reporting of non-destructive test examinations 9.2.7 Routine pressure test 9.2.8 Tightness test 9.3 Certification 9.3.1 Design specification, drawings and data sheets 9.3.2 Certificate 9.3.3 Stamping 9.3.4 Final inspection of castings 10 Pressure relief devices 10.1 General <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 10.2 Bursting discs 10.3 Self-closing pressure relief valves 10.4 Non-self-closing pressure relief devices <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Figure 1 \u2014 Flange connections <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Annex A (informative) A-deviations <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" High-voltage switchgear and controlgear. Gas-filled cast aluminium alloy enclosures<\/b><\/p>\n |