1、BS EN 50052:2016High-voltage switchgear andcontrolgear Gas-filled castaluminium alloy enclosuresBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 50052:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50052:2016. It super
2、sedes BS 6878:1988+A2:1993 which is withdrawn. The UK participation in its preparation was entrusted to TechnicalCommittee PEL/17/1, High-voltage switchgear and controlgear.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purp
3、ort to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI Standards Limited 2016ISBN 978 0 580 87027 9ICS 29.130.10Compliance with a British Standard cannot confer immunity fromlegal obligation
4、s.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2016.Amendments/Corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 50052:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50052 December 2016 ICS 29.130.10
5、 Supersedes EN 50052:1986 English Version High-voltage switchgear and controlgear - Gas-filled cast aluminium alloy enclosures Enveloppes moules en alliage daluminium pour les appareillages haute tension sous pression de gaz Hochspannungs-Schaltgerte und -Schaltanlagen - Gasgefllte Kapselungen aus L
6、eichtmetallguss This European Standard was approved by CENELEC on 2016-09-12. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and
7、bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under th
8、e responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia
9、, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for
10、 Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Memb
11、ers. Ref. No. EN 50052:2016 E BS EN 50052:2016EN 50052:2016 (E) 2 Contents Page European foreword .4 Introduction .5 1 General .6 1.1 Scope 6 1.2 Normative references 6 1.3 Quality assurance 7 2 Normal and special service conditions .7 3 Terms and definitions .7 4 Materials 10 4.1 Selection of mater
12、ial. 10 4.2 Chemical analysis. 11 5 Design 11 5.1 General 11 5.2 Calculation Methods. 12 5.2.1 General 12 5.2.2 Evaluation of mechanical strength using “Design by Formula” . 12 5.2.3 Evaluation of mechanical strength using “Design by Analysis” 12 5.2.4 Flanges 13 5.2.5 Bolted connections 14 5.3 Insp
13、ection and access openings 14 6 Manufacture and workmanship . 14 6.1 Manufacture 14 6.2 Consultation between manufacturer and founder 14 6.3 Foundry technique . 14 6.4 Geometry and dimensions 15 6.5 Chemical composition and mechanical properties 15 6.5.1 Sampling 15 6.5.2 Chemical composition . 15 6
14、.5.3 Mechanical properties 15 6.6 Workmanship 15 6.6.1 Surface finish 15 6.6.2 Soundness 15 7 Repair of casting defects . 16 7.1 General 16 7.2 Repair by welding . 16 7.2.1 Welding performance test . 16 7.2.2 Weld procedure . 16 7.2.3 Weld procedure test . 16 7.2.4 Application to castings 17 7.2.5 P
15、reparation of castings for weld repairs 17 7.2.6 Inspection of weld repair areas . 18 7.3 Impregnation of castings . 18 8 Thermal treatment 18 8.1 Thermal treatment procedure 18 8.2 Methods of heating . 18 8.3 Quenching . 18 8.4 Calibration of furnace temperature. 18 8.5 Thermal treatment charts 18
16、BS EN 50052:2016 EN 50052:2016 (E) 3 9 Inspection, testing and certification . 19 9.1 Type tests 19 9.1.1 General 19 9.1.2 Burst test procedure 19 9.1.3 Strain measurement test 19 9.2 Inspection and routine tests 20 9.2.1 General 20 9.2.2 Visual inspection 20 9.2.3 Dye penetrant examination 20 9.2.4
17、 Radiographic examination . 20 9.2.5 Ultrasonic examination 20 9.2.6 Reporting of non-destructive test examinations . 21 9.2.7 Routine pressure test . 21 9.2.8 Tightness test . 21 9.3 Certification . 21 9.3.1 Design specification, drawings and data sheets 21 9.3.2 Certificate 21 9.3.3 Stamping . 21
18、9.3.4 Final inspection of castings 21 10 Pressure relief devices 21 10.1 General 21 10.2 Bursting discs . 22 10.3 Self-closing pressure relief valves . 22 10.4 Non-self-closing pressure relief devices . 22 Annex A (informative) A-deviations 24 Bibliography . 26 BS EN 50052:2016EN 50052:2016 (E) 4 Eu
19、ropean foreword This document (EN 50052:2016) has been prepared by CLC/TC 17AC “High-voltage switchgear and controlgear”. The following dates are fixed: latest date by which this document hasto be implemented at national level bypublication of an identical nationalstandard or by endorsement(dop) 201
20、7-09-12 latest date by which the nationalstandards conflicting with thisdocument have to be withdrawn(dow) 2019-09-12 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying
21、 any or all such patent rights. This document supersedes EN 50052:1986. This European Standard supplements the relevant product standards on gas-insulated switchgear and controlgear in that it provides specific requirements for pressurized high-voltage switchgear and controlgear. This European Stand
22、ard has been written to get a European specification for the design, construction, testing, inspection and certification of pressurized enclosures used in high-voltage switchgear and controlgear. In this respect, this European Standard constitutes the exclusion of HV switchgear from the scope of the
23、 Directive 2014/68/EU (superseding 97/23/EC) concerning pressure equipment. Article 1, 2. (l) excludes “enclosures for high-voltage electrical equipment such as switchgear, controlgear, transformers, and rotating machines” from the scope of the Directive. This European Standard deals with gas-insula
24、ted switchgear enclosures of cast aluminium alloy. For different enclosure materials other European Standards are available. BS EN 50052:2016 EN 50052:2016 (E) 5 Introduction This standard covers the requirements for the design, construction, testing, inspection and certification of gas-filled enclo
25、sures for use specifically in high-voltage switchgear and controlgear, or for associated gas-filled equipment. Special consideration is given to these enclosures for the following reasons. (a) The enclosures usually form the containment of electrical equipment, thus their shape is determined by elec
26、trical rather than mechanical requirements. (b) The enclosures are installed in restricted access areas and the equipment is operated by instructed, authorized persons only. (c) As the thorough drying of the inert, non-corrosive gas medium is fundamental to the satisfactory operation of the electric
27、al equipment, the gas is periodically checked. For this reason, no internal corrosion allowance is required on the wall thickness of these enclosures. (d) The enclosures are subjected to only small fluctuations of pressure as the gas-filling density shall be maintained within close limits to ensure
28、satisfactory insulating and arc-quenching properties. Therefore the enclosures are not liable to fatigue due to pressure cycling. (e) The operating pressure is relatively low. Due to the foregoing reasons and to ensure maximum service continuity as well as to reduce the risk of moisture and dust ent
29、ering the enclosures which may endanger safe electrical operation of the switchgear, no pressure tests should be carried out after installation and before placing in service and no periodic inspection of the enclosure interiors or pressure tests should be carried out after the equipment is placed in
30、 service. BS EN 50052:2016EN 50052:2016 (E) 6 1 General 1.1 Scope 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
31、switchgear and controlgear above 1 kV, where the gas is used principally for its dielectric and/or arc-quenching properties with rated voltages - 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); - and with rat
32、ed voltage above 52 kV. The enclosures comprise parts of electrical equipment not necessarily limited to the following examples: - Circuit-breakers - Switch-disconnectors - Disconnectors - Earthing switches - Current transformers - Voltage transformers - Surge arrestors - Busbars and connections - e
33、tc. The scope also covers enclosures of pressurized components such as the centre chamber of live tank switchgear, gas-insulated current transformers, etc. 1.2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its
34、 application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10204, Metallic products Types of inspection documents EN 12258-1:2012, Aluminium and aluminium alloys Terms and definition
35、s Part 1: General terms EN 50064, Wrought aluminium and aluminium alloy enclosures for gas-filled high-voltage switchgear and controlgear EN 62271-1:2008, High-voltage switchgear and controlgear Part 1 Common specifications (IEC 62271-1:2007) EN 62271-203:2012, High-voltage switchgear and controlgea
36、r Part 203: Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV (IEC 62271-203:2011) EN ISO 898 (series), Mechanical properties of fasteners made of carbon steel and alloy steel EN ISO 6520-1:2007, Welding and allied processes Classification of geometric imperfections in metallic
37、materials Part 1: Fusion welding (ISO 6520-1:2007) BS EN 50052:2016 EN 50052:2016 (E) 7 EN ISO 9712, Non-destructive testing Qualification and certification of NDT personnel (ISO 9712) EN ISO 15614-4, Specification and qualification of welding procedures for metallic materials Welding procedure test
38、 Part 4: Finishing welding of aluminium castings (ISO 15614-4) 1.3 Quality assurance It is the intention of this standard that the switchgear manufacturer shall be responsible for achieving and maintaining a consistent and adequate quality of the product. Sufficient examinations shall be made by the
39、 founder to ensure that the materials, production and testing comply in all respects with the requirements of this standard. Inspection by the user inspectors shall not absolve the manufacturer or the founder from their responsibility to exercise such quality assurance procedures as to ensure that t
40、he requirements of this standard are satisfied. 2 Normal and special service conditions Clause 2 of EN 62271-1:2008 is applicable. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 enclosure part of gas-insulated metal-enclosed switchgear retai
41、ning the insulating gas under the prescribed conditions necessary to maintain safely the rated insulation level, protecting the equipment against external influences and providing a high degree of protection to personnel 3.2 manufacturer organisation that is responsible for the design of the enclosu
42、re and the production of the gas-insulated switchgear. In this standard this is the switchgear manufacturer 3.3 founder organisation that produces the raw casting of the enclosure 3.4 design pressure pressure, expressed in relative terms (gauge), used to determine the thickness of the enclosure Note
43、 1 to entry: It is at least equal to the maximum pressure in the enclosure at the highest temperature that the gas used for insulation can reach under specified maximum service conditions. 3.5 design temperature (of an enclosure) maximum temperature that the enclosures can reach under specified maxi
44、mum service conditions SOURCE: 3.112, EN 62271-203:2012 Note 1 to entry: This is generally the upper limit of ambient air temperature increased by the temperature rise due to the flow of rated normal current. Note 2 to entry: Solar radiation should be taken into account when it has a significant eff
45、ect on the temperature of the gas and on the mechanical properties of materials. Similarly, the effects of low temperatures on the properties of materials should be considered. BS EN 50052:2016EN 50052:2016 (E) 8 3.6 design stress maximum permissible stress on the enclosure imposed by conditions of
46、operation, environment or test that determine the (material) characteristics of an enclosure 3.7 normal load load whose occurrence and level can be planned or predicted 3.8 exceptional load load whose probability of occurrence during the lifetime of product is very small or accidental 3.9 casting pr
47、oduct at or near finished shape, formed by solidification of the metal in a mould or a die SOURCE: EN 12258-1:2012, 2.5.1 3.10 melt quantity of molten metal that has simultaneously undergone the same preparatory treatment in the furnace before the casting operation SOURCE: EN 12258-1:2012, 4.1.3 3.1
48、1 alloy substance having metallic properties and composed of two or more elements so combined that they cannot readily be separated by physical means SOURCE: EN 12258-1:2012, 2.2.1 3.12 casting defect imperfections in castings after solidification 3.12.1 cold shut linear discontinuity in a cast surf
49、ace caused by freezing of the melt meniscus in contact with the mould and the liquid metal flowing over the solidified metal SOURCE: EN 12258-1:2012, 5.2.1 3.12.2 cold crack crack in cast metal initiated by mechanical stresses at temperatures significantly below the solidus temperature SOURCE: EN 12258-1:2012, 5.2.9 3.12.3 hot crack (hot tear) crack formed in a cast metal or in a welding because of internal stress developed upon cooling at the solidus temperature or slightly above SOURCE: EN 12258-1:2012, 5.2.8 BS EN 50052:2016 EN 500
