1、BRITISH STANDARDBS EN 50464-2-3:2007Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV Part 2-3: Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 2 for use on
2、 distribution transformers meeting the requirements of EN 50464-2-1The European Standard EN 50464-2-3:2007 has the status of a British StandardICS 29.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g
3、40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50464-2-3:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 57700 0National forewordThis British Standard is the UK implementation of EN 50464-
4、2-3:2007. It supersedes BS 7821-2.3:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers.A list of organizations represented on this committee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 50464-2-3 NORME 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 50464-2-3:2007 E ICS 29.180 Supersedes HD 428.2.3 S1:1998English 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 2-3: Distribution transfor
8、mers 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 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 2-3: Transformateurs de distributionraccords par botes cble ct haute tension et/ou ct basse tension - Botes cbles de type 2 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 2-3: Verteilungstransformatoren mit Kabelanschlussksten auf der Ober- und/oder Unterspannungsseite - Kabelanschlussksten Typ 2 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 50464-2-3:2007 - 2 - Foreword The text of the Harmonization Document HD 428.2.3 S1:1998, prepared by the Technical Committee CENELEC TC 14, Power transfo
15、rmers, was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 50464-2-3 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 endorsem
16、ent (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 transformer
17、s 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 t
18、ransformers 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 concer
19、ning pressurised corrugated tanks - 3 - EN 50464-2-3:2007 Contents 1 Scope4 1.1 High-voltage side. 4 1.2 Low-voltage side . 4 2 Normative references4 3 Definitions4 4 High-voltage connections 4 5 Low-voltage connections.6 6 Design.8 7 Test.8 Figures Figure 1 High-voltage connection directly to bushi
20、ngs 5 Figure 2 High-voltage connection via busbar system 6 Figure 3 Low-voltage connection directly to bushings .7 Figure 4 Low-voltage connection to busbar system 7 Table Table 1 Minimum distances in the cable box 5 EN 50464-2-3:2007 - 4 - 1 Scope Cable boxes described in this European Standard cor
21、respond to cable boxes Type 2 in EN 50464-2-1 and are suitable for assembly on the cover of oil-immersed distribution transformers meeting the requirements of EN 50464-2-1. Cable boxes are air-filled, metal- or non-metal enclosed, for high- and/or low-voltage connections in the following variations:
22、 1.1 High-voltage side a) Connection directly to bushings; b) Connection via busbar system. 1.2 Low-voltage side a) Connection directly to bushings (maximum of four connectors per bushing); b) Connection via busbar system. 2 Normative references For the purposes of this document, the normative refer
23、ences of EN 50464-2-2 apply. 3 Definitions For the purposes of this document, the terms and definitions of EN 50464-2-2 apply. 4 High-voltage connections High-voltage bushings shall preferably be in accordance with EN 50180, pollution class II. Dimension D, which is the minimum distance between live
24、 parts and between live parts and earth, is given in Table 1 and indicated in Figures 1 and 2. The value of D may be decreased by inserting barriers of insulating material. In this case, the insulation level shall be demonstrated by test. Busbars in Figure 2 shall be dimensioned by reference to rate
25、d currents and short-circuit forces. Connection may be by single- or multi-core cables. Figures 1 and 2 show typical arrangements; the actual design may vary. - 5 - EN 50464-2-3:2007 Table 1 Minimum distances in the cable box UMRated short duration power frequency withstand voltage (r.m.s.) Rated li
26、ghtning impulse withstand voltage (peak) Minimum clearance D kV kV kV mm List 1 List 2 List 1 List 2 3,6 10 20 40 - 60 7,2 20 40 60 60 90 12 28 60 75 90 125 17,5 38 75 95 125 170 24 50 95 125 170 225 36 70 145 170 275 315 NOTE Values in the table according to EN 60076-3, Table 2. Figure 1 High-volta
27、ge connection directly to bushings The details of the cable entry, dimension L (distance between the cable entry and the bushing connection), angle and other cable entry directions shall be subject to agreement between manufacturer and purchaser. EN 50464-2-3:2007 - 6 - View as in Figure 1 Figure 2
28、High-voltage connection via busbar system The details of the cable entry, dimension L (distance between the cable entry and the busbar connection) and other cable entry directions shall be subject to agreement between manufacturer and purchaser. 5 Low-voltage connections Low-voltage bushings shall b
29、e in accordance with EN 50386. Dimension D, which is the minimum clearance between live parts and between live parts and earth, is indicated in Figures 3 and 4. The minimum value of D shall be 40 mm. Busbars in Figure 3 shall be dimensioned by reference to rated currents and short-circuit forces. Co
30、nnection may be by single- or multi-core cables. Figures 3 and 4 show typical arrangements, the actual design may vary. - 7 - EN 50464-2-3:2007 Figure 3 Low-voltage connection directly to bushings The details of the cable entry, dimension L (distance between the cable entry and the bushing connectio
31、n), angle and other cable entry directions shall be subject to agreement between manufacturer and purchaser. View as in Figure 3 Figure 4 Low-voltage connection to busbar system The arrangement of the cable entry, dimension L (distance between the cable entry and the busbar connection), angle and ot
32、her cable entry directions shall be subject to agreement between manufacturer and purchaser. EN 50464-2-3:2007 - 8 - 6 Design Cable boxes shall be fastened on transformer covers by screws or by welding. For convenient cable access, cable boxes shall be provided with covered openings with handles. Th
33、e protection class shall be IP33 to IP55 in accordance with EN 60529. Suitable ventilation shall be provided. The assembly of cable boxes to the transformer covers may be achieved using flanges. Means of earthing the cable box to the transformer cover shall be provided. Cable entry surfaces shall be
34、 prepared for easy assembly. The type and quantity of cable entries shall be subject to agreement between manufacturer and purchaser. Earthing bosses for cable armour shall be provided. For single-core cable connections at the appropriate current, cable entry surfaces shall be of non-magnetising mat
35、erial. The following cable box arrangements shall be available: a) high-voltage bushings only; b) low-voltage bushings only; c) common for high- and low-voltage bushings; d) common for high- and low-voltage bushings, with segregation between high- and low-voltage bushings. NOTE The positions of the
36、tap-changer drive and lifting lugs, and whether they are inside or outside the cable box, should be subject to agreement between manufacturer and purchaser. 7 Test If the cable box is dimensioned according to Table 1, the cable box need not be tested with the transformer. Verification of dimensions
37、guarantees full functionality. If dimensions have been reduced from those in Table 1 through the use of insulating barriers, separate tests with power frequency and lightning impulse voltages shall be carried out. Cable boxes may be separated from the transformer for these tests. blankBS EN 50464-2-
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