EN 50464-2-1-2007 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 2-1 Distributio.pdf

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

2、ean Standard EN 50464-2-1:2007 has the status of a British StandardICS 29.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50464-2-1:2007Thi

3、s British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 57703 1National forewordThis British Standard is the UK implementation of EN 50464-2-1:2007. It supersedes BS 7821-2.1:1995 which is withdrawn.The UK participa

4、tion 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 include all the necessary provisions of a contract. Users are responsible for

5、 its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 50464-2-1NORME EUROPENNE EUROPISCHE NORM April 2007 CENELEC European Committee for Electrotechnical Standardization

6、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 means reserved worldwide for CENELEC members. Ref. No. EN 50464-2-1:2007 E ICS

7、29.180 Supersedes HD 428.2.1 S1:1994English 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 2-1: Distribution transformers with cable boxes on the high-voltage and/or low-voltage side - General r

8、equirements Transformateurs triphass de distribution immergs dans lhuile, 50 Hz, de 50 kVA 2 500 kVA, de tension la plus leve pour le matriel ne dpassant pas 36 kV - Partie 2-1: Transformateurs de distributionraccords par botes cble ct haute tension et/ou ct basse tension - Prescriptions gnrales lge

9、fllte Drehstrom-Verteilungstransformatoren 50 Hz, 50 kVA bis 2 500 kVA, mit einer hchsten Spannung fr Betriebsmittel bis 36 kV - Teil 2-1: Verteilungstransformatoren mit Kabelanschlussksten auf der Ober- und/oder Unterspannungsseite - Allgemeine Anforderungen This European Standard was approved by C

10、ENELEC 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 stan

11、dards 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 not

12、ified 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, Lithuan

13、ia, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 50464-2-1:2007 - 2 - Foreword The text of the Harmonization Document HD 428.2.1 S1:1994, prepared by the Technical Committee CENELEC TC 14, Power trans

14、formers, was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 50464-2-1 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 endors

15、ement (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 transform

16、ers with 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

17、 transformers 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 conc

18、erning pressurised corrugated tanks - 3 - EN 50464-2-1:2007 Contents Introduction4 1 Scope5 2 Definitions5 3 Electrical characteristics .6 4 Design characteristics.6 4.1 Type of oil preservation and degree of sealing. 6 4.2 Terminal markings. 6 4.3 Provision for cable box Type 1 connections. 6 4.4 P

19、rovision for cable box Type 2. 6 5 Transformer requirements .6 5.1 Transformers with cable boxes, mounted on both sides. 6 5.2 Transformers with cable boxes, cover mounted. 7 5.3 Unit substation transformer, with cable boxes mounted on the same side 7 5.4 Unit substation transformer with flange boxe

20、s, cover mounted. 7 6 Distance between bushings.8 7 Tests .8 Figures Figure 1 Transformer with cable boxes, Type 1 side mounted Limiting dimensions 9 Figure 2 Unit substation transformer, with cable boxes Type 1 side mounted Limiting dimensions .10 Figure 3 Transformers with cable boxes, Type 1 cove

21、r mounted .11 Figure 4 Cover mounted, air filled common HV/LV cable box Type 2 .11 Figure 5 Unit substation transformers, cover mounted12 Figure 6 Typical flange for flange box12 EN 50464-2-1:2007 - 4 - Introduction EN 50464-1, Subclause 4.3 states that a distribution transformer could have differen

22、t termination features. The following constructional situations are possible. i) Termination in open type (oil-air) bushings without protection. This is covered by EN 50464-1, EN 50180, EN 50386 and EN 50387. ii) Termination in plug-in type bushings of inside or outside cone type. This is covered by

23、 EN 50464-1 and EN 50180. iii) Termination in air filled or compound filled cable boxes or protective enclosure using open type and/or oil/compound oil-oil bushings, as defined in EN 50464-2-2. iv) Flange boxes and similar solutions using open type bushings can also be used. - 5 - EN 50464-2-1:2007

24、1 Scope EN 50464-2-1 covers, in conjunction with EN 50464-1, distribution transformers under iii) and iv) above, up to 36 kV (the data from 24 kV to 36 kV are under consideration). Further documents exist which may be used by agreement between purchaser and manufacturer for cable boxes and enclosure

25、s. The dimensional requirements for cable boxes and protective enclosures are not enclosed in this document. 2 Definitions For the purposes of this document, distribution transformers shall be classified according to the following definitions: 2.1 transformers with cable boxes, side mounted transfor

26、mer with electrical characteristics in the range defined in EN 50464-1, with facings on the transformer tank side for provision of cable boxes Type 1. These facings shall be on opposite sides of the transformer (as Figure 1) 2.2 transformers with cable boxes or similar, cover mounted transformer wit

27、h electrical characteristics in the range defined in EN 50464-1, with terminations mounted on the tank cover. The terminations exit in such a way as to provide for cables on opposite sides of the transformer. The type of termination can be either cable box Type 1 or cable box Type 2 (as per Figures

28、3 or 4) 2.3 unit substation transformer, side mounted transformer with electrical characteristics in the range defined in EN 50464-1, having facings on the transformer tank side for provision of HV switchgear and LV equipment. These facings shall be on the same side of the transformer (as per Figure

29、 2) 2.4 unit substation transformer, cover mounted transformer with electrical characteristics in the range defined in EN 50464-1, with terminations mounted on the tank cover and enclosed in a flange box. Figure 5 shows a typical arrangement, however, dimension should be agreed between manufacturer

30、and purchaser 2.5 cable boxes, Type 1 metallic box designed for receiving and protecting the ends of HV or LV cables so that the cable dielectric may be effectively sealed against moisture damage. A minimum protection of IP54 is required. These boxes are not specified in this section. A higher prote

31、ction, IP65, may be necessary to satisfy termination requirements 2.6 cable boxes, Type 2 metallic or non metallic enclosure designed to prevent accidental contact with live parts. The enclosure can be common to HV and LV terminations or be independent for HV and LV. A protection between IP33 and IP

32、55 is required and is subject to agreement between manufacturer and purchaser EN 50464-2-1:2007 - 6 - 2.7 flange box enclosure designed to provide flanges for mounting ancillary equipment on opposite sides of the transformer as per Figures 5 and 6. The box is mounted on the cover of the transformer.

33、 The IP rating is dependent on the mounted equipment and is subject to agreement between manufacturer and purchaser 3 Electrical characteristics These shall comply with EN 50464-1, Clause 3. In respect of EN 50464-1, 3.11 a), also list 1 for impulse withstand voltage is admitted. To derive the insul

34、ation and dielectric test level, the impulse withstand voltage shall be taken from EN 60076-3, Table 2, as agreed between manufacturer and purchaser. 4 Design characteristics 4.1 Type of oil preservation and degree of sealing These shall comply with EN 50464-1, 4.1. 4.2 Terminal markings These shall

35、 comply with EN 50464-1, 4.2. 4.3 Provision for cable box Type 1 connections Facings shall be provided for mounting HV and LV bushing assemblies and cable boxes, as detailed in Figures 1, 2 and 3 of this document. Fixing methods shall be provided on transformer facings positioned as defined on the a

36、ppropriate drawings given in Figures 1, 2, and 3. 4.4 Provision for cable box Type 2 Facings shall be provided for mounting HV and LV bushings assemblies with cable box Type 2 as shown in Figures 4 and 5. The use of independent HV and LV enclosures shall be subject to agreement between manufacturer

37、and purchaser. 5 Transformer requirements 5.1 Transformers with cable boxes, mounted on both sides Limiting dimensions are indicated in Figure 1. The underbase is generally in the form of skids, provided with axle holes. Four jacking lugs shall be provided, if specified by the purchaser. Two lifting

38、 fittings shall be provided of adequate section. These shall be positioned to facilitate lifting in a reasonably upright position, taking into account the cable box weight. These weights to be given by the purchaser if necessary. Unless otherwise stated, cable boxes Type 1 as defined in 2.5 shall be

39、 fitted to the high voltage facing and a bushing assembly shall be fitted to the low voltage facing. The termination of the low voltage shall be specified by purchaser at time of enquiry. - 7 - EN 50464-2-1:2007 Other accessories shall comply with EN 50464-1, Clause 5 and shall preferably be mounted

40、 on one end of the tank and shall not be obstructed by coolers Unless otherwise agreed, two earthing terminals shall be fitted on the centre line, one below each connection facing, with the connection hole placed on the lower part of the tank. 5.2 Transformers with cable boxes, cover mounted There a

41、re no limiting dimensions. The accessories shall comply with Clause 5 of EN 50464-1. 5.2.1 Cable box Type 1 A cable box Type 1 shall be fitted to the high voltage flange. The termination of the low voltage shall be as specified by the purchaser at time of enquiry. One method of cover mounting cable

42、boxes Type 1 is shown in Figure 3 of this document which defines its own flange fitting that shall always be maintained. 5.2.2 Cable box Type 2 A cable box Type 2 is provided for either both high voltage and low voltage termination or only one of them. This shall be agreed between manufacturer and p

43、urchaser. One method of cover mounting cable boxes Type 2 is shown in Figure 4 of this document. 5.3 Unit substation transformer, with cable boxes mounted on the same side Limiting dimensions are indicated in Figure 2. A stable fixing for HV switchgear equipment can be requested by the purchaser, in

44、 a position as indicated in Figure 2. The requirements of this fixing shall be capable of supporting an agreed load and designed so as to not load the facing flange. An LV bushing plate assembly shall be provided on a mounting pocket. The mounting pocket flange face shall lie in the same plane as th

45、e face of the pocket provided for the HV ring main equipment. The termination of the low voltage shall be specified by the purchaser. The flange face of the mounting pockets of HV/LV shall be flat and sufficiently robust to prevent distortion and oil leakage when the agreed equipment is bolted there

46、to. The transformer tank with its cover shall be capable of withstanding the combined loads of the agreed attached equipment without distortion. The transformer shall not be moved or lifted in this condition and shall be stable. Lifting fittings shall be provided on the transformers tank of adequate

47、 section to facilitate lifting that transformer and fittings in a reasonably upright position, with or without the agreed attached equipment. 5.4 Unit substation transformer with flange boxes, cover mounted The general arrangement in the case of common HV and LV flange box is shown in Figure 5. For

48、independent HV and LV enclosures, see 4.4. A typical flange for interfacing between the flange box and Type 2 cable boxes is shown in Figure 6. The accessories shall comply with Clause 5 of EN 50464-1. EN 50464-2-1:2007 - 8 - 6 Distance between bushings The distance between bushings is detailed in f

49、urther sections of this document. 7 Tests Type and routine tests of the transformers should be in accordance with EN 50464-1. The transformer may be tested without cable boxes. If it is required to test with boxes attached, then in the case of fully insulated air filled boxes it is allowed to perform tests with the cable boxes filled with oil. The fitting with oil is not allowed for the purpose of type testing air filled boxes. Other test requirements may be required as a consequence of further sections of this document. - 9 - EN 50