EN 50588-3-2018 Medium power transformers 50 Hz with highest voltage for equipment not exceeding 36 kV - Part 3 Transformers with cable boxes on the high-voltag.pdf

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1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kVPart 3: Transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 1 for use on transformers meeting

2、 the requirements of EN 50588-2BS EN 50588-3:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50588-3 March 2018 ICS 29.180 Supersedes EN 50464-2-2:2007 English Version Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV - Part 3: Transformers with cable b

3、oxes on the high-voltage and/or low-voltage side - Cable boxes type 1 for use on transformers meeting the requirements of EN 50588-2 Transformateurs 50 Hz de moyenne puissance, de tension la plus leve pour le matriel ne dpassant pas 36 kV - Partie 3: Transformateurs raccords par botes cble ct haute

4、tension et/ou ct basse tension - Botes cbles de type 1 pour utilisation pour transformateurs conformes aux exigences de la EN 50588-2 Mittelleistungstransformatoren 50 Hz, mit einer hchsten Spannung fr Betriebsmittel nicht ber 36 kV - Teil 3: Verteiltransformatoren mit Kabelanschlussksten auf der Ob

5、er- und/oder Unterspannungsseite - Kabelanschlussksten Typ 1 fr Verteiltransformatoren nach EN 50588-2 This European Standard was approved by CENELEC on 2017-12-25. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European S

6、tandard the status of a national standard without any alteration. Up-to-date lists and 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

7、(English, French, German). A version in any other language made by translation under the 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 committe

8、es of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovak

9、ia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018

10、CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50588-3:2018 E National forewordThis British Standard is the UK implementation of EN 50588-3:2018. It supersedes BS EN 50464-2-2:2007, which is withdrawn.The UK participation in its pr

11、eparation was entrusted to Technical Committee PEL/14, Power transformers.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. Users are responsible for its correct a

12、pplication. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 51262 9ICS 29.180Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Comm

13、ittee on 31 July 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 50588-3:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50588-3 March 2018 ICS 29.180 Supersedes EN 50464-2-2:2007 English Version Medium power transformers 50 Hz, with highest voltag

14、e for equipment not exceeding 36 kV - Part 3: Transformers with cable boxes on the high-voltage and/or low-voltage side - Cable boxes type 1 for use on transformers meeting the requirements of EN 50588-2 Transformateurs 50 Hz de moyenne puissance, de tension la plus leve pour le matriel ne dpassant

15、pas 36 kV - Partie 3: Transformateurs raccords par botes cble ct haute tension et/ou ct basse tension - Botes cbles de type 1 pour utilisation pour transformateurs conformes aux exigences de la EN 50588-2 Mittelleistungstransformatoren 50 Hz, mit einer hchsten Spannung fr Betriebsmittel nicht ber 36

16、 kV - Teil 3: Verteiltransformatoren mit Kabelanschlussksten auf der Ober- und/oder Unterspannungsseite - Kabelanschlussksten Typ 1 fr Verteiltransformatoren nach EN 50588-2 This European Standard was approved by CENELEC on 2017-12-25. CENELEC members are bound to comply with the CEN/CENELEC Interna

17、l 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 application to the CEN-CENELEC Management Centre or to any CE

18、NELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the offici

19、al versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Ma

20、lta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN

21、-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50588-3:2018 E BS EN 50588-3:2018EN 50588-3:2018 (E) 2 Contents Page European foreword 3 1 Scope . 4 2 Normative

22、references 4 3 Terms and definitions . 4 4 Electrical requirements and clearances . 5 4.1 General . 5 4.2 High voltage enclosures . 5 4.3 Low voltage boxes . 7 5 Design considerations . 7 5.1 General . 7 5.2 Terminal nuts and stems 7 5.3 Provision for glanding cables . 7 5.4 Termination of cables wi

23、thin enclosure . 7 6 Testing . 7 6.1 Type tests . 7 6.2 Routine tests . 8 7 Earthing of cable boxes 8 BS EN 50588-3:2018EN 50588-3:2018 (E) 3 European foreword This document (EN 50588-3:2018) has been prepared by CLC/TC 14, “Power Transformers“. The following dates are fixed: latest date by which th

24、is document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2018-12-15 latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2020-12-15 This document supersedes EN 50464-2-2:2007. The EN

25、50588 series consists of the following parts, under the general title “Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV”: Part 1: General requirements Part 2: Transformers with cable boxes on the high-voltage and/or low-voltage side General requirements for tra

26、nsformers with rated power less than or equal to 3150kVA Part 3: Transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 1 for use on transformers meeting the requirements of EN 50588-2 Part 4: Transformers with cable boxes on the high-voltage and/or low-voltage si

27、de Cable boxes type 2 for use on transformers meeting the requirements of EN 50588-2 BS EN 50588-3:2018EN 50588-3:2018 (E) 4 1 Scope This European Standard specifies the requirements for cable boxes, Type 1, in which the cable cores are terminated. The cable boxes are suitable for use on transformer

28、s defined in EN 50588-2, “Transformers with Cable Boxes”, for side mounted or cover mounted use. The cable boxes are suitable for operation indoors and outdoors under environmental conditions specified in EN 50588-1. Important design and construction requirements of the cable boxes are given. 2 Norm

29、ative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any a

30、mendments) applies. EN 50180, Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers Part 1: General requirements for bushings EN 50387:2002, Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liquid filled transformers EN 60076 (series), Power transformers (I

31、EC 60076 series, partially modified) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ I

32、SO Online browsing platform: available at http:/www.iso.org/obp 3.1 fully insulated cable box metallic cable box where those parts of the termination and bushing within the enclosure including live metal parts and cable cores are insulated by oil or compound and allowance made for thermal expansion.

33、 The box is suitably sealed to contain the oil or compound and allows for their expansion due to temperature changes 3.2 air filled cable box metallic cable box designed to protect the ends of the cables and bushings, providing a weatherproof enclosure with a minimum rating of IP54 3.2.1 air insulat

34、ed termination air filled cable box within which the cable cores are electrically terminated by stress control appropriate to the cable design and voltage; air being the sole insulation for the terminal connections 3.2.2 shrouded insulation termination air filled cable box within the cable cores are

35、 terminated as in 3.2.1 with additional local insulation enhancement, e.g. phase barrier, bushing protection or taping. Enhancement can be achieved using insulated phase barriers; however, in this case, air bushings with full creepage distance shall be used BS EN 50588-3:2018EN 50588-3:2018 (E) 5 4

36、Electrical requirements and clearances 4.1 General The enclosures when in position on the equipment with which they are to be used shall be capable of withstanding the high voltage tests specified in EN 50588-1 as well as commissioning tests to be carried out on the connected cable. 4.2 High voltage

37、 enclosures The rated voltage of a box is the highest voltage designated for the equipment and preferred values in use are given in Table 1. Table 1 defines the minimum clearances required between live metal parts, and between live metal parts to earth, and insulator creepage requirements. The fixin

38、g flange types are as given in EN 50588-2, Figure 2 However, shorter clearances may be agreed subject to confirmation by test. Bushings suitable for use in high voltage enclosures are specified in the documents listed in Clause 2, and in particular in EN 50180. Other bushings can be used if agreed b

39、etween purchaser and manufacturer provided the minimum limiting dimensions of Table 1 are complied with. NOTE For dimension G see EN 50180. Figure 1 Clearance distances BS EN 50588-3:2018EN 50588-3:2018 (E) 6 Table 1 Three phase cable box, Type 1 Air insulation List 1 List 2 BIL A B C E BIL A B C E

40、Single core 3 core min. max. Single core 3 core kV kVp mm mm mm mm mm kVp mm mm mm mm mm mm 12 60 90 90 125 495 585 75 120 120 125 200 495 585 24 95 160 160 224 585 685 125 200 200 205 305 575 685 36 145 270 270 309 625 880 170 320 320 325 380 625 880 Fully insulated oil/compound filled List 2 BIL A

41、 B C E Single core 3 core kV kVp mm mm mm mm mm 12 75 45 32 50 495 585 24 125 100 75 90 575 685 36 170 125 100 135 625 880 Shrouded List 2 BIL A B C E Single core 3 core kV kVp mm mm mm mm mm 12 75 55 50 80 495 585 24 125 110 100 140 575 685 36 170 165 150 225 625 880 NOTE The above clearance dimens

42、ions are minimal. The design of enclosure should take account of the actual manufacturers dimensions for the terminals to ensure that all clearances are complied with. The distances given in the table are consistent with the minimum clearances necessary; the currently available bushings, however, as

43、 described in EN 50180 have distances, especially C, in excess of those given in the table. This fact should be taken into account when sizing the cable box. List 1 distances are for use with shedded bushings. The clearances given assume that the cable termination connected to the bushing cap does n

44、ot reduce the clearance dimension. Air Insulation List 2 - C values. Minimum values are based on BS practice and experience. Maximum values are in line with EN 50180. For voltage levels below 12 kV the dimensions A, B, C and E are subject to agreement between purchaser and manufacturer. For applicat

45、ion of List 1 and List 2, see EN 60076-3. Cables above 185 mm2should not be crossed in boxes with E dimensions equal to those given. The E dimension can be extended to a dimension agreed between manufacturer and purchaser when crossed cables are required. BS EN 50588-3:2018EN 50588-3:2018 (E) 7 4.3

46、Low voltage boxes All low voltage boxes shall be capable of accepting either bushings or monobloc or single bloc busbar type terminations of the correct rating for the maximum current required from the transformer. The box flange is as given in EN 50588-2, Figure 1. Due consideration shall be given

47、to the effects of electromagnetic induced losses caused by high currents. On agreement between purchaser and manufacturer, the flange types can be different to those given. Terminations suitable for use in LV cable boxes are specified in EN 50180 and EN 50387. 5 Design considerations 5.1 General The

48、 boxes shall be self-contained. The bushing mounting plate is an integral part of the enclosure for HV boxes. Cast iron shall not be used. Fully insulated cable boxes shall be suitably sealed to contain the oil or the compound and allowance made for thermal expansion. Ventilation measures are to be

49、provided in the case of air filled boxes of IP54 protection. Means of draining air filled boxes are to be provided. Filling measures are to be provided in the case of oil/compound filled boxes and due consideration made to the filling medium expansion due to temperature changes. 5.2 Terminal nuts and stems The dimensions of terminal nuts and stems are related to the bushings in use for the appropriate currents and are given in relevant standards. 5.3 Provision for glanding cabl