EN 50464-2-2-2007 en Three-phase oil-immersed distribution transformers 50 Hz from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV - Part 2-2 Distributio.pdf

1、BRITISH STANDARDBS EN 50464-2-2:2007Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV Part 2-2: Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 1 for use on

2、 distribution transformers meeting the requirements of EN 50464-2-1The European Standard EN 50464-2-2:2007 has the status of a British StandardICS 29.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g

3、40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50464-2-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 57699 7National forewordThis British Standard is the UK implementation of EN 50464-

4、2-2:2007. It supersedes BS 7821-2.2:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers.A list of organizations represented on this committee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 i

5、nclude all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 50464-2-2NORME EUROPENNE EUROPISCHE NOR

6、M April 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any me

7、ans reserved worldwide for CENELEC members. Ref. No. EN 50464-2-2:2007 E ICS 29.180 Supersedes HD 428.2.2 S1:1997English version Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV - Part 2-2: Distribution transfor

8、mers with cable boxes on the high-voltage and/or low-voltage side - Cable boxes type 1 for use on distribution transformers meeting the requirements of EN 50464-2-1 Transformateurs triphass de distribution immergs dans lhuile, 50 Hz, de 50 kVA 2 500 kVA, de tension la plus leve pour le matriel ne dp

9、assant pas 36 kV - Partie 2-2: Transformateurs de distributionraccords par botes cble ct haute tension et/ou ct basse tension - Botes cbles de type 1 pour utilisation sur transformateurs de distribution conformes aux exigences de la EN 50464-2-1 lgefllte Drehstrom-Verteilungstransformatoren 50 Hz, 5

10、0 kVA bis 2 500 kVA, mit einer hchsten Spannung fr Betriebsmittel bis 36 kV - Teil 2-2: Verteilungstransformatoren mit Kabelanschlussksten auf der Ober- und/oder Unterspannungsseite - Kabelanschlussksten Typ 1 fr Verteilungstransformatoren nach EN 50464-2-1 This European Standard was approved by CEN

11、ELEC on 2006-12-01. 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 bibliographical references concerning such national standa

12、rds may be obtained on application to the Central Secretariat 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 the responsibility of a CENELEC member into its own language and notif

13、ied to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania

14、, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 50464-2-2:2007 2 Foreword The text of the Harmonization Document HD 428.2.2 S1:1997, prepared by the Technical Committee CENELEC TC 14, Power transformer

15、s, was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 50464-2-2 on 2006-12-01. The following date was fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement

16、(dop) 2007-12-01 The EN 50464 series consists of the following parts, under the general title “Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV”: Part 1 General requirements Part 2-1 Distribution transformers wi

17、th cable boxes on the high-voltage and/or low-voltage side General requirements Part 2-2 Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 1 for use on distribution transformers meeting the requirements of EN 50464-2-1 Part 2-3 Distribution trans

18、formers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 2 for use on distribution transformers meeting the requirements of EN 50464-2-1 Part 3 Determination of the power rating of a transformer loaded with non-sinusoidal currents Part 4 Requirements and tests concerning

19、 pressurised corrugated tanks 3 EN 50464-2-2:2007 Contents 1 Scope4 2 Normative references4 3 Definitions4 4 Electrical requirements and clearances 5 4.1 General. 5 4.2 High voltage enclosures 7 4.3 Low voltage boxes 8 5 Design considerations.7 5.1 General. 8 5.2 Terminal nuts and stems . 8 5.3 Prov

20、ision for glanding cables. 8 5.4 Termination of cables within enclosure 8 6 Testing 7 6.1 Type tests . 9 6.2 Routine tests. 9 7 Earthing of cable boxes 8 Figure Figure 1 Clearance distances .5 Table Table 1 Three phase cable box, Type 1.6 EN 50464-2-2:2007 4 1 Scope This European Standard specifies

21、the requirements for cable boxes, Type 1, in which the cable cores are terminated. The cable boxes are suitable for use on transformers defined in EN 50464-2-1, “Distribution Transformers with Cable Boxes“, for side mounted or cover mounted use. The cable boxes are suitable for operation indoors and

22、 outdoors under environmental conditions specified in EN 50464-1. Important design and construction requirements of the cable boxes are given. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cite

23、d applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50180 Bushings above 1 kV up to 36 kV and from 250 A to 3,15 kA for liquid filled transformers EN 50181 1997 Plug-in type bushings above 1 kV up to 36 kV and from 250 A to 1,25 kA

24、for equipment other than liquid filled transformers EN 50336 2002 Bushings for transformers and reactor cable boxes not exceeding 36 kV EN 50386 2002 Bushings up to 1 kV and from 250 A to 5 kA, for liquid filled transformers EN 50387 2002 Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liqu

25、id filled transformers EN 60076 series Power transformers (IEC 60076 series, partially modified) EN 60529 1993 Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989) 3 Definitions For the purposes of this document, the following terms and definitions apply. 3.1 fully insulated cable

26、 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 The box is suitably sealed to contain the oil or compound and allows for their expansion

27、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 5 EN 50464-2-2:2007 3.2.1 air insulated termination air filled cable box within which the cable cores are e

28、lectrically 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 terminated as in 3.2.1 with additional local insulation enhancement,

29、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 4 Electrical requirements and clearances 4.1 General The enclosures when in position on the equipment with which

30、 they are to be used shall be capable of withstanding the high voltage tests specified in EN 50464-1 as well as commissioning tests to be carried out on the connected cable. 4.2 High voltage enclosures The rated voltage of a box is the highest voltage designated for the equipment and preferred value

31、s 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 fixing flange types are as given in EN 50464-1, Figure 1. However, shorter clearances may be agreed subject to conf

32、irmation 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 between purchaser and manufacturer provided the minimum limiting dimensions of Table 1 are complied with. NOTE

33、 For dimension G see EN 50180. Figure 1 Clearance distances EN 50464-2-2:2007 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 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 12

34、5 200 495 585 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 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 Shroud

35、ed 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 dimensions are minima. The design of enclosure should take account of the actual manufacturers dimensions for the terminals to ensure t

36、hat all clearances are complied with. The distances given in the table are consistent with the minimum clearances necessary; the currently available bushings, however, as described in EN 50180 have distances, especially C, in excess of those given in the table. This fact should be taken into account

37、 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 not reduce the clearance dimension. Air Insulation List 2 - C values. Minimum values are based on BS practice and experience. Maxim

38、um 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 application of List 1 and List 2, see EN 60076-3. Cables above 185 mm should not be crossed in boxes with E dimensions equal to those give

39、n. The E dimension can be extended to a dimension agreed between manufacturer and purchaser when crossed cables are required. 7 EN 50464-2-2:2007 4.3 Low voltage boxes All low voltage boxes shall be capable of accepting either bushings or monobloc or single bloc busbar type terminations of the corre

40、ct rating for the maximum current required from the transformer. The box flange is as given in EN 50464-2-1, Figure 1. Due consideration shall be given to the effects of electromagnetic induced losses caused by high currents. On agreement between purchaser and manufacturer, the flange types can be d

41、ifferent 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 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 ins

42、ulated cable boxes shall be suitably sealed to contain the oil or the compoundand allowance made for thermal expansion. Ventilation measures are to be 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 provid

43、ed 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

44、. 5.3 Provision for glanding cables NOTE Under consideration in TC 20. 5.4 Termination of cables within enclosure To allow for termination of cables, the minimum vertical distance from the surface of the bushing cap to the gland plate shall be as given in Figure 1. The dimension E allows only for un

45、crossed cables at above 185 mm. 6 Testing 6.1 Type tests A new design of an enclosure shall be subject to the following type tests if clearances lower than those given in Table 1 are used. Tests are required on the cable box not necessarily connected to the transformer. EN 50464-2-2:2007 8 6.1.1 Ele

46、ctrical Rated Lightning Impulse Withstand on the high voltage box, terminated with cables as in service. Rated Short Duration Power Frequency Withstand on the enclosure, terminated with cables as in service. The voltage levels for these tests will be appropriate impulse and power frequency levels fo

47、r the highest system voltage as defined in EN 60076-3. 6.1.2 Mechanical A mechanical test shall be made on oil/compound filled boxes by subjecting the box to a pressure of 1 bar for 15 min at room temperature. There shall be no permanent distortion when the pressure is released. 6.2 Routine tests Di

48、mensional checks shall be made to ensure that the enclosure is the same as the prototype tested. All oil/compound filled boxes shall be tested with oil at room temperature at a pressure of 0,76 bar for 12 h. No leakage shall occur into oil free spaces or any permanent deflection when the pressure is

49、 released. 7 Earthing of cable boxes Means shall be provided to earth the cable box and the cable metallic armour/sheet/screen to the box. The rating of the earth connection shall be appropriate for the system earth fault current. blankBS EN 50464-2-2:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is