1、BRITISH STANDARD BS EN 50243:2002 Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for liquid filled transformers The European Standard EN 50243:2002 has the status of a British Standard ICS 29.080.20; 29.180 BS 50243:2002 This British Standard, having been prepared under the direction of
2、 the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 23 July 2002 BSI 23 July 2002 ISBN 0 580 40135 9 National foreword This British Standard is the official English language version of EN 50243:2002. The UK p
3、articipation in its preparation was entrusted by Technical Committee PEL/36, Insulators for power systems, to Subcommittee PEL/36/1, Bushing insulators, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-refere
4、nces The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British
5、Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to
6、 the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside
7、 front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50243 NORME EUROPENNE EUROPISCHE NORM A
8、pril 2002 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 2002 CENELEC - All rights of exploitation in any form and by any means
9、 reserved worldwide for CENELEC members. Ref. No. EN 50243:2002 E ICS 29.080.20; 29.180 English version Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for liquid filled transformers Traverses dextrieur pour 24 kV et 36 kV et pour 5 kA et 8 kA, pour transformateurs remplissage de liquide
10、 Durchfhrungen fr Freiluft, 24 kV und 36 kV sowie 5 kA und 8 kA, fr flssigkeitsgefllte Transformatoren This European Standard was approved by CENELEC on 2001-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European S
11、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 Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English,
12、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 Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgi
13、um, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Nor- way, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 50243:2002 - 2 - Contents Page Foreword . 3 Introduction . 4 1 Scope 4 2 Normative references 4 3 Definitions 5
14、 4 Requirements . 54.1 Application . 54.2 Standard values of highest voltage for equipment (U m ) . 54.3 Standard values of rated current (I r) 54.4 Compliance 54.5 Common dimensions and creepage distances of bushings type A and type B . 54.6 Parts list according to bushing type A 84.7 Parts list ac
15、cording to bushing type B 9 Annex A (normative) Detail drawings of components . 10 A.1 Insulator (Item N 1) . 10 A.2 Conductor tube (Item N 2) 1 3 A.3 Upper cap (Item N 4) 14 A.4 Lower cap (Item N 6) . 14 A.5 Nut (Item N 3) 15 A.6 Sealing ring (Item N 5) 15 A.7 Flat gasket (Item N 9) . 15 A.8 Flat g
16、asket (Item N 18) . 15 A.9 Clamping ring (Item N 16) . 16 A.10 Interlayer (Item N 13) 16 A.11 Compression ring (Item N 11) . 17 A.12 Retaining ring (Item N 12) . 17 A.13 Flat gasket (Item N 10) . 18 A.14 Clamping paw (Item N 17) 1 8- 3 - EN 50243:2002 Foreword This European Standard was prepared by
17、the Technical Committee CENELEC TC 36A, Insulated bushings. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50243 on 2001-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical
18、 national standard or by endorsement (dop) 2003-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-02-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annex A is normative. _EN 50243:2002 - 4 - Introducti
19、on The object of this standard is to specify the requirements of outdoor bushings for highest voltages for equipment 24 kV and 36 kV and for rated currents 5 kA and 8 kA. 1 Scope This standard is applicable to ceramic insulated outdoor bushings for highest voltages for equipment of 24 kV and 36 kV,
20、with rated currents of 5 kA and 8 kA and frequencies from 15 Hz up to 60 Hz for insulating liquid filled transformers. This standard establishes dimensions to ensure interchangeability and adequate mounting of bushings. Two types of construction are specified, type A and type B, both types for highe
21、st voltages for equipment 24 kV and 36 kV and rated currents of 5 kA and 8 kA. The mechanical stresses of the conductor tube make the difference between type A and type B. The conductor tube of type A is axially and radially fixed in the top of the bushing. The inner line terminal of the transformer
22、 can be flexible and without any special support for the lower end of the conductor tube. In case of type B, the conductor tube is only radially fixed in the top of the bushing. In that case, a rigid support has to be mounted to fix the lower end of the conductor tube (for example, in combination wi
23、th a drip proofed sealing end). The drip proofed sealing end is often required in the service requirements. In this case, it is not possible to use type A because of the existing double fixation. Therefore, both bushing types A and B have to be specified. The condition for the usage of type B is tha
24、t the drip prooved sealing end is able to withstand the mechanical stress in axial direction. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and
25、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications ap- ply to this European Standard only when incorporated in it by amendment or revision. For undated refer- ences, the latest edition of the publication referred to applies
26、 (including amendments). EN 60137 1996 Insulated bushings for alternating voltages above 1 kV (IEC 60137:1995) EN 60672-3 1997 Ceramic and glass-insulating materials - Part 3: Specifications for individual materials (IEC 60672-3:1997) HD 329 S1 1977 Tests on hollow insulators for use in electrical e
27、quipment (IEC 60233:1974) IEC 60815 1986 Guide for the selection of insulators in respect of polluted conditions ISO 261 ISO general-purpose metric screw threads - General plan ISO 286-2 ISO system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and sh
28、afts ISO 1101 Technical drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, indications on drawings ISO 1302 Technical drawings - Method of indicating surface texture ISO 2768 General tolerances- 5 - EN 50243:2002 3 Definitions For
29、 the purposes of this standard, the following definitions apply: 3.1 bushing type A a bushing with a conductor tube which is axially and radially fixed in the top of the bushing 3.2 bushing type B a bushing with a conductor tube which is only radially fixed in the top of the bushing 4 Requirements 4
30、.1 Application The open type bushings covered by this standard shall be suitable for operation with one end fully immersed in an insulating liquid and with the other in air. 4.2 Standard values of highest voltage for equipment (U m ) The value of U mof a bushing shall be chosen from the standard val
31、ues given below, in kilovolts: 24 - 36 4.3 Standard values of rated current (I r ) The value of I rof a bushing shall be chosen from the standard values given below, in amperes: 5 000 - 8 000 4.4 Compliance The bushings shall meet the requirements of EN 60137. 4.5 Common dimensions and creepage dist
32、ances of bushings type A and type B The common dimensions of bushings type A and type B shall be as specified in Figure 1 and Table 1. The details of the components are given in Annex A. The provisions for arcing horns should be made if required. In case of environmental conditions, which do not req
33、uire pollution level II or more according to IEC 60815, an insulator with a reduced creepage distance can be agreed between the purchaser and the manufacturer without changing the common dimensions.EN 50243:2002 - 6 - Table 1 - Common dimensions of bushings type A and type B Designation U m kV I r A
34、 Min. nominal creepage distance acc. to IEC 60815 mm Insulator type Arcing distance mm l 1 mm l 2 min. mm l 3 mm l 4 max. mm l 5 max. mm 24-5/P2-A 24-5/P2-B 24 5 000 270 540 100 320 150 100 24-8/P2-A 24-8/P2-B 24 8 000 480 24-P2 270 570 130 320 150 100 24-5/P4-A 24-5/P4-B 24 5 000 380 635 100 415 17
35、5 125 24-8/P4-A 24-8/P4-B 24 8 000 744 36-P2 380 665 130 415 175 125 36-5/P2-A 36-5/P2-B 36 5 000 380 635 100 415 175 125 36-8/P2-A 36-8/P2-B 36 8 000 720 36-P2 380 665 130 415 175 125 36-5/P3-A 36-5/P3-B 36 5 000 370 635 100 415 175 125 36-8/P3-A 36-8/P3-B 36 8 000 900 36-P3 370 665 130 415 175 125
36、 NOTE Designation of a complete bushing type A according to EN 50243 for U m 24 kV and I r 5 kA, with a creepage distance suitable for pollution level II according to IEC 60815:1986: 24 5/P2 A.- 7 - EN 50243:2002Type B Type A All dimensions in mm NOTE 1 It is not permitted to apply a corrosion prote
37、ction on the metallic coating of the insulating body of the bushings U m 36 kV before the bushing respectively the insulating body is mounted on the transformer cover. NOTE 2 Dimensions without individual tolerance indications have to be toleranced according to ISO 2758 mK, holes and shafts accordin
38、g to ISO 286-2. Definitions of threads according to ISO 261. NOTE 3 The specified tightening torque of the nut M 90 x 4 (Item 3) is 140 Nm (greased). Figure 1 - Dimensions of bushings type A and type BEN 50243:2002 - 8 - 4.6 Parts list according to bushing type A Table 2 - List of components, bushin
39、g type A Item Quantity Designation Remarks 1 1 24-P21 1 1 1 1 Insulator 36-P2 Porcelain (see A.1) 1 1 36-P3 1 24-5 1 24-8 1 1 1 36-52 111 Conductor tube 36-8 Copper (see A.2)3 1 Nut (see A.5)4 1 Upper cap (see A.3)5 1 Sealing ring (see A.6)6 1 Lower cap (see A.4)7 2 Gasket Polyamid (PA6)8 2 Vent plu
40、g Corrosion-resistant9 1 Flat gasket (see A.7) 10 1 Flat gasket (see A.13) 11 1 Compression ring (see A.11) 12 1 Retaining ring (see A.12) 13 1 Interlayer (see A.10) 14 10 Nut M12 Corrosion-resistant 15 10 Washer A13 Corrosion-resistant 16 1 Clamping ring (see A.9) 17 10 Clamping paw (see A.14) 18 1
41、 Flat gasket (see A.8) 19 1 Pipe 18 x 2 E-Cu 20 1 Cable 10 E-Cu 70 mm length 21 2 Cable lug A6 x 4,3 22 2 Screw M6x8 Stainless steel 23 2 Spring washer A6 Stainless steel Screws and nuts with thread profile according to ISO 261.- 9 - EN 50243:2002 4.7 Parts list according to bushing type B Table 3 -
42、 List of components, bushing type B Item Quantity Designation Remarks 1 1 24-P21 1 1 1 1 Insulator 36-P2 Porcelain (see A.1) 1 1 36-P3 1 24-5 1 24-8 1 1 1 36-52 111 Conductor tube 36-8 Copper (see A.2)3 1 Nut (see A.5)4 1 Upper cap (see A.3)5 1 Sealing ring (see A.6)6 1 Lower cap (see A.4)7 2 Gasket
43、 Polyamid (PA6)8 2 Vent plug Corrosion-resistant9 1 Flat gasket (see A.7) 13 1 Interlayer (see A.10) 14 10 Nut M12 Corrosion-resistant 15 10 Washer A13 Corrosion-resistant 16 1 Clamping ring (see A.9) 17 10 Clamping paw (see A.14) 18 1 Flat gasket (see A.8) 19 1 Pipe 18 x 2 E-Cu 20 1 Cable 10 E-Cu 7
44、0 mm length 21 2 Cable lug A6 x 4,3 22 2 Screw M6x8 Stainless steel 23 2 Spring washer A6 Stainless steel Screws and nuts with thread profile according to ISO 261.EN 50243:2002 - 10 - Annex A (normative) Detail drawings of components Details not given have to be chosen appropriately. A.1 Insulator (
45、Item N 1) All dimensions in mm Calculated nominal creepage distance of represented insulator: 480 mm. Unless otherwise stated in the drawing, tolerances according to HD 329 S1. Tolerances in the drawing according to ISO 1101 and ISO 1302. Material: Porcelain complying with C 100 series EN 60672-3:19
46、97 or equivalent material. Colour: Brown. Surface: Glazed except machined surfaces, ground surface and surfaces marked with . Figure A.1 - Insulator (Item N 1), type 24-P2- 11 - EN 50243:2002 All dimensions in mm Calculated nominal creepage distance of represented insulator: 744 mm. Unless otherwise
47、 stated in the drawing, tolerances according to HD 329 S1. Tolerances in the drawing according to ISO 1101 and ISO 1302. Material: Porcelain complying with C 100 series EN 60672-3:1997 or equivalent material. Colour: Brown. Surface: Glazed except machined surfaces, ground surface and surfaces marked
48、 with . Surfaces marked with are metallized. Figure A.2 - Insulator (Item N 1), type 36-P2EN 50243:2002 - 12 - All dimensions in mm Calculated nominal creepage distance of represented insulator: 900 mm. Unless otherwise stated in the drawing, tolerances according to HD 329 S1. Tolerances in the draw
49、ing according to ISO 1101 and ISO 1302. Material: Porcelain complying with C 100 series EN 60672-3:1997 or equivalent material Colour: Brown. Surface: Glazed except machined surfaces, ground surface and surfaces marked with . Surfaces marked with are metallized. Figure A.3 - Insulator (Item N 1), type 36-P3- 13 - EN 50243:2002 A.2 Conductor tube (Item N 2) All dimensions in mm Dimensions without ind
