EN 50069-1991 en Welded composite enclosures of cast and wrought aluminium alloys for gas-filled high-voltage switchgear and controlgear (Incorporates Amendment A1 1993 Incorporati.pdf

1、BRITISH STANDARD BS EN 50069:1991 +A1:1993 Incorporating corrigendum August 2007 Specification for Welded composite enclosures of cast and wrought aluminium alloys for gas-filled high-voltage switchgear and controlgear ICS 29.130.10 BS EN 50069:1991+A1:1993 This British Standard was published under

2、the authority of the Standards Board and comes into effect on 28 June 1991 BSI 2008 ISBN 978 0 580 60720 2 National foreword This British Standard is the UK implementation of EN 50069:1991+A1:1993, incorporating corrigendum August 2007. It supersedes BS EN 50069:1991, which is withdrawn. The start a

3、nd finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to CENELEC text carry the number of the CENELEC amendment. For example, text altered by CENELEC amendment A1 is indicated by !“. The start and finish of text introduced or altered by corrig

4、endum is indicated in the text by tags. Text altered by CENELEC corrigendum August 2007 is indicated in the text by . National appendix NA gives details of International Standards quoted in this standard for which there is an identical or technically equivalent British Standard. The UK participation

5、 in its preparation was entrusted to Technical Committee PEL/17/1, High-voltage switchgear and controlgear. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. User

6、s are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication Amd. No. Date Comments 8055 December 1993 Implementation of CENELEC amendment A1:1993 30 September 2008 Implementation of CE

7、NELEC corrigendum August 2007. Implementation of National corrigendum Italian and French A-deviations re-instated in Annex AEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN50069:1991+A1 August 1993 UDC621.316.37-213.6-034.715 Descriptors: Enclosure, high-voltage switching device, H.V. metal-encl

8、osed switchgear and controlgear, pressurized enclosure, welded cast and wrought aluminium alloy parts English version Welded composite enclosures of cast and wrought aluminium alloys for gas-filled high-voltage switchgear andcontrolgear Enveloppes soudes en alliage daluminium comportant des parties

9、moules et des parties en mtal corroy pour lappareillage haute tension sous pression de gaz Geschweite Kapselungen von Teil aus Leichtmetallgu und Aluminium-Knetlegierungen fr gasgefllte Hochspannungs-Schaltgerte und- Schaltanlagen This European Standard was approved by CENELEC on 5 March 1990. CENEL

10、EC 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 bibliographical references concerning such national standards may be obtained on ap

11、plication to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). Aversion in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secreta

12、riat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC E

13、uropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN50069:1991 E Incorporating corrigendu

14、m August 20072 Foreword At the request of CENELEC technical committee TC 17C, the text of the draft EN 50069 prepared by TC 17C was submitted to the Unique Acceptance Procedure(UAP). The text of the draft was approved by all CENELEC members with the exception of Austria and Sweden as EN 50069 on 5 M

15、arch 1990. The following dates were fixed: For products which have complied with the relevant national standard before 1991-06-01, as shown by the manufacture or by a certification body, this previous standard may continue to apply for production until 1996-06-01. This document forms a supplement to

16、 EN 50052:1986: “Cast aluminium alloy enclosures for gas-filled high-voltage switchgear and controlgear” and EN 50064:1989: “Wrought aluminium and aluminium alloy enclosures for gas-filled high-voltage switchgear and controlgear”, concerning welded enclosures for the same type of switchgear and cont

17、rolgear but composed of parts made of cast and wrought aluminium alloys. It is based on the general specifications given in HD 358 S2 (IEC 517:1986 ed 2) which are however not sufficient to satisfy the conditions for the service allowance of pressurized high-voltage switchgear and controlgear. These

18、 specifications are appropriate for pressurized switchgear enclosures allowing an economic production without sacrificing aspects of safety. For unusual shapes dictated by electrical conditions they permit the verification of sound design by proof tests instead of calculations. Nevertheless this Eur

19、opean Standard makes use of many internationally well acknowledged calculation rules and the Technical Committee will in addition pursue the progress in standardization in CEN/TC 121 and ISO/TC 44 on welding and allied processes. For the time being reference can only be made to published Internation

20、al Standards as far as they are appropriate for the purpose of production of enclosures to be used in gas-filled switchgear and controlgear. The present EN has been established as an international specification for the design, construction, testing, inspection and certification of pressurized enclos

21、ures used in high-voltage switchgear and controlgear. This standard follows to that extent also Article 2 of the Directive 76/767/EEC. The European Standard contains one informative annex: “National Deviations”. List of standards referred to in this standard: Foreword to amendment A1 This amendment

22、was prepared by CENELEC Technical Committee TC17C, High-voltage enclosed switchgear and controlgear. The text of the draft was submitted to the voting procedure in March1993 and was approved by CENELEC as amendment A1 to EN50069:1991 on July6, 1993. The following dates were accepted: latest date of

23、publication ofan identical national standard (dop) 1991-06-01 latest date of withdrawal ofconflicting national standards (dow) 1991-06-01 HD 358 S2 (IEC 517:1986 ed 2) Gas-insulated metal-enclosed switchgear for rated voltages of72,5 kV and above ISO 6213:1983 Welding; Items to be considered to ensu

24、re quality in welding structures ISO 9000:1987 Guidelines for selection and use of the standards on quality management, quality system elements and quality assurance ISO/IEC Guide2:1986 General terms and their definitions concerning standardization and related activities ISO 6520:1982 Classification

25、 of imperfections in metallic fusion welds, with explanations ISO 3134:1985 Light metals and their alloys; Terms and definitions latest date of publication ofan identical national standard (dop) 1994-10-01 latest date of withdrawal ofconflicting national standards (dow) 1993-10-01 BS EN 50069:1991+A

26、1:1993 BSI 20083 Contents Page Foreword 2 1 Introduction 5 2 Scope and field of application 5 3 Definitions 5 4 Materials 7 5 Design 7 6 Manufacture and workmanship 9 7 Inspection and testing 9 8 Pressure relief devices 12 9 Certification and marking 12 Annex A (informative) National deviations 14 T

27、able 1 List of recommended cast aluminium alloys 8 Table 2 Examples of materials 9 BS EN 50069:1991+A1:1993 BSI 2008blank5 1 Introduction This standard covers the requirements for the design, construction, testing, inspection and certification of gas-filled enclosures for use specifically in high-vo

28、ltage 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 electrical rather than mechanical consider

29、ations. b) The enclosures are installed in restricted access areas and the equipment is operated by experts and instructed persons only. c) As the thorough drying of the inert, non-corrosive gas-filling medium is fundamental to the satisfactory operation of the electrical equipment it is periodicall

30、y 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 satisfactory insulating and arc-quenc

31、hing properties. Therefore, the enclosures are not liable to fatigue due to pressure cycling. e) The operating pressure is relatively low. For the foregoing reasons, and to ensure the minimum disturbance hence reducing the risk of moisture and dust entering the enclosures which would prevent correct

32、 electrical operation of the switchgear, no pressure tests shall be carried out after installation and before placing in service and no periodic inspection of the enclosure interiors or pressure tests shall be carried out after the equipment is placed in service. 2 Scope and field of application 2.1

33、 Type of equipment This standard applies to welded composite enclosures of cast and wrought aluminium and 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

34、 switchgear and controlgear, where the gas is used principally for its dielectric and/or arc-quenching properties, with rated voltages. 1 kV and up to and including 52 kV and with gas-filled compartments with design pressure and with rated voltage 72,5 kV and above. The enclosures comprise parts of

35、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. The scope covers also pressurized components such as the centre-cham

36、ber of live tank switchgear and controlgear, gas-insulated current transformers, etc. 2.2 Production The production of the enclosures shall be in accordance with documented welding procedures which shall be carried out by well trained and supervised welding personnel. Where International Standards (

37、ISO or CEN) are not available, National Standards may be used. NOTEThis standard will be revised as soon as possible when ISO or CEN standards covering the various aspects are available. 2.3 Quality assurance It is the intention of this standard, that the switchgear manufacturer shall be responsible

38、 for achieving and maintaining a consistent and adequate quality of product. Sufficient examinations shall be made by the enclosure manufacturer to ensure that the materials, production and testing comply in all respects with the requirements of this standard and ISO6213:1983. Inspection by the user

39、s inspectors shall not absolve the switchgear manufacturer from his responsibility to exercise such quality assurance procedures as to ensure that the requirements and the intent of this standard are satisfied. NOTEReference should be made to the ISO9000 series of standards for quality assurance sys

40、tems. 3 Definitions 3.1 national standard a technical specification established by general agreement with the important part of the concerned interests, approved by a recognized national standards organization and made available to the public (ISO/IEC Guide 2:1986.) ! “ BS EN 50069:1991+A1:1993 BSI

41、2008 greater than 3 bar (gauge);6 3.2 enclosure a part of gas-insulated metal-enclosed switchgear retaining 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

42、protection to personnel. HD358 S2 IEC517 (1989) ed2 3.3 manufacturer individual or body responsible for designing and producing the enclosure. In this standard this is the switchgear manufacturer 3.4 designer individual or body who determines the shape, dimensions and wall thickness of the enclosure

43、 and selects the materials and method of construction and testing 3.5 founder individual or body who produces the raw casting 3.6 design pressure (of an enclosure) pressure used to determine the wall thickness of the enclosure. It is at least the upper limit of pressure reached within the enclosure

44、at the design temperature. HD358 S2 IEC517 (1989) ed2 3.7 design temperature (of an enclosure) highest temperature reached by the enclosure which can occur under service conditions. This is generally the upper limit of ambient air temperature increased by the temperature rise due to the flow of rate

45、d normal current. HD358 S2 IEC517 (1989) ed 2 NOTESolar radiation should be taken into account when it has a significant effect on the temperature of the gas and on the mechanical properties of some materials. Similarly the effects of low temperatures on the properties of some materials should be co

46、nsidered. 3.8 casting a general term for products at or near finished shape, formed by solidification of a metal or alloy in a mould. ISO3134-4:1985 3.9 alloy a metallic substance consisting of a mixture of the basic metallic element (the element predominating by mass) and other elements such as all

47、oying elements and impurities. ISO3134-1:1985 3.10 aluminium alloy a metallic substance in which aluminium predominates by mass and the other elements exceed1% of the total content by weight 3.11 Cast and weld imperfections 3.11.1 gas cavity a cavity formed by entrapped gas. ISO6520:1982, No. 201 3.

48、11.2 shrinkage cavity a cavity due to shrinkage during solidification. ISO6520:1982, No. 202 3.11.3 solid inclusion solid foreign substances entrapped in the cast or weld metal. ISO6520:1982, No. 300 3.11.4 lack of fusion lack of union between weld metal and parent metal or weld metal and weld metal

49、. ISO6520:1982, No.401 3.11.5 lack of penetration lack of fusion between parent metal and parent metal due to failure of weld metal to extend into the root of the joint. ISO6520:1982, No.402 3.11.6 imperfect shape imperfect shape of the external surfaces of the weld or defective joint geometry. ISO6520:1982, No.500 3.11.7 cracks a discontinuity produced by a local rupture which may arise from the effect of cooling or stresses. I