1、BRITISH STANDARD BS3297-2: 1993 IEC 273:1990 Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than1000 V (Implementation of CENELEC HD 578 S1) UDC 621.315.624:621.3.027.4BS3297-2:1993 This British Standard, having been prepared under the directionof the
2、 Power ElectricalEngineering StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15January 1993 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference PEL/70 Draft for comment 90/24326 DC ISBN 0 580 2145
3、4 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Policy Committee (PEL/-) to Technical Committee PEL/70, upon which the following bodies were represented: Association of Consulting Engineers Asso
4、ciation of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) British Industrial Ceramic Manufacturers Association Electrical and Electronic Insulation Association (BEAMA Ltd.) Electricity Association Transmission and Distribution Association (BEAMA Ltd.) The following bodie
5、s were also represented in the drafting of the standard, through subcommittees and panels: BECCAMA BEAMA Electrical Cable Connector and Accessories Manufacturers Association Amendments issued since publication Amd. No. Date CommentsBS3297-2:1993 BSI 04-2000 i Contents Page Committees responsible Ins
6、ide front cover National foreword ii Foreword 2 Text of HD 578 S1 3 National annex NA (informative) Cross-references Inside back coverBS3297-2:1993 ii BSI 04-2000 National foreword This British Standard has been prepared under the direction of the Power Electrical Engineering Standards Policy Commit
7、tee. It implements Harmonization Document HD578S1 published by the European Committee for Electrotechnical Standardization (CENELEC). This British Standard is identical with IEC273:1990 Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than1000V, publish
8、ed by the International Electrotechnical Commission (IEC), which has been endorsed by CENELEC as HD578S1. This British Standard supersedes BS3297-2:1982 which is withdrawn. A special national condition applicable to Germany is given in Annex ZB. The graphic signs, symbols and letters used may be fou
9、nd in the following documents. National annex NA gives details of International Standards quoted in this standard for which there is an identical or technically equivalent British Standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
10、andards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. BS 3939 Graphical symbols for electrical power, telecommunications and electronics diagrams Part 1:1986 General Information, general index Part 2:1985
11、Symbol elements, qualifying symbols and other symbols having general application Part 3:1985 Conductors and connecting devices Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theHD title page, pages2 to 30, an inside back cover and a back cover. This st
12、andard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 578 S1 July 1992 UDC 621.315.624:621.3.027.4 Descriptors: Insulator
13、s, characteristics, systems, nominal voltages greater than 1000 V English version Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000 V (IEC273:1990) Caractristiques des supports isolants dintrieur et dextrieur destins des installations de tensio
14、n nominale suprieure1000 V (CEI273:1990) Kenngren von Innenraum- und Freiluft- Sttzisolatoren fr Systeme mit Nennspannungen ber 1000 V (IEC273:1990) This Harmonization Document was approved by CENELEC on 1991-09-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
15、stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in
16、 three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC
17、European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1992 Copyright reserved to CENELEC members Ref. No. HD 578 S1:1992 EBS3297-2:1993 BSI 04-2
18、000 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC273:1990 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as Harmonization Document. The reference document wa
19、s submitted to the CENELEC members for formal vote and was approved by CENELEC as HD578S1 on23September 1991. The following dates were fixed: For products which have complied with the relevant national standard before 1992-10-01, as shown by the manufacturer or by a certification body, this previous
20、 standard may continue to apply for production until 1997-10-01. Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA and Annex ZB are normative. Contents Page Foreword 2 Section 1. General 1 Scope 3 2 Object 3 3 Electrical characteristics 3 4 Mechanical ch
21、aracteristics 4 5 Dimensional characteristics 5 6 Fixing arrangements 6 7 Plan of the standard 6 8 Designation of post insulators 7 Section 2. Examples of insulator types Figure 1 Example of an indoor post insulator of ceramic material or glass 8 Figure 2 Example of an indoor post insulator of organ
22、ic material 9 Figure 3 Example of an outdoor cylindrical post insulator with internal metal fittings 10 Figure 4 Example of an outdoor cylindrical post insulator with external metal fittings 11 Page Figure 5 Example of an outdoor pedestal post insulator 11 Section 3. Characteristics of standard post
23、 insulators Table I Indoor post insulators of ceramic material or glass and with internal metal fittings 12 Table IA Optional auxiliary holes in the top and/or bottom metal fitting 13 Table II Indoor post insulators of organic material and with internal metal fittings 13 Table IIA Optional auxiliary
24、 holes in the top and/or bottom metal fitting 15 Table III Outdoor cylindrical post insulators of ceramic material or glass and with internal metal fittings 15 Table IIIA Optional auxiliary holes in the top and/or bottom metal fittings 16 Table IV Outdoor cylindrical post insulators of ceramic mater
25、ial or glass and with external metal fittings 16 Table IVA Standard fixing arrangements of outdoor cylindrical post insulators with external metal fittings 19 Table V Outdoor pedestal post insulator units (metric units) 20 Table VA Standard fixing arrangements of pedestal post insulators 21 Table VI
26、 Outdoor pedestal post insulator units (inch-pound units) 20 Table VIA Standard fixing arrangements of pedestal post insulators 21 Table VII Outdoor pedestal post insulator units. Bending strength in stacks (metric units) 21 Table VIII Outdoor pedestal post insulator units. Bending strength in stack
27、s (inch-pound units) 21 Appendix A 22 Table AI Examples of composition of outdoor pedestal post insulators (metric units) 22 Table AII Examples of composition of outdoor pedestal post insulators (inch-pound units) 25 Annex ZA (normative) Other international publications quoted in this standard with
28、the references to relevant European publications 28 Annex ZB (normative) Special national conditions 29 latest date of announcement of the HD atnational level (doa) 1992-04-01 latest date of publication ofa harmonized national standard (dop) 1992-10-01 latest date of withdrawal ofconflicting nationa
29、l standards (dow)1992-10-01BS3297-2:1993 BSI 04-2000 3 Section 1. General 1 Scope This standard applies to post insulators and post insulator units of ceramic material or glass intended for indoor or outdoor service, and to post insulators of organic material intended for indoor service in electrica
30、l installations or equipment operating on alternating current systems with a nominal voltage greater than1000 V and a frequency not greater than 100 Hz. It may also be regarded as a provisional standard for insulators for use on direct current systems. The insulators covered by this standard are pri
31、marily intended for use in isolators (disconnectors) or as bus-bar or fuse supports. This standard covers five types of post insulators: a) indoor post insulators of ceramic material or glass and with internal metal fittings; b) indoor post insulators of organic material and with internal metal fitt
32、ings; c) outdoor cylindrical post insulators of ceramic material or glass and with internal metal fittings; d) outdoor cylindrical post insulators of ceramic material or glass and with external metal fittings; e) outdoor pedestal post insulators of ceramic material or glass. The term “cylindrical in
33、sulators” is intended to cover insulators of the truncated conical form also. The five types of insulators are distinguished by their electrical, mechanical and dimensional characteristics. Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5 illustrate typical examples of each type of insulator. The
34、se drawings are only general illustrations and other shapes and constructions are permitted. 2 Object This standard is intended to establish standard values of those electrical characteristics, mechanical characteristics and dimensions which are essential for the interchangeability of post insulator
35、s and post insulator units of the same type. NOTE 1General definitions and methods of test for insulators of ceramic material or glass are covered by IEC Publication 168. General definitions and methods of test for insulators of organic material are covered by IEC Publication 660. NOTE 2The values o
36、f creepage distance as well as information on design aspects are provisional. These values are not directly related to the specified electrical characteristics. The performance of insulation under contaminated conditions has been considered, with the object of determining the significant factors inf
37、luencing performance. An application guide (IEC Publication 815) has been prepared recommending the range of suitable designs. The guide also indicates: definitions of the site severity different methods for determining the site severity corresponding creepage distance the significance and influence
38、 of different parameters characterising the insulator profiles the influence of the diameter the influence of the angle of the installation of the insulator alternative measures to be considered such as greasing or washing. 3 Electrical characteristics Each post insulator is designated for a specifi
39、ed lightning impulse withstand voltage based on the standardized values given in IEC Publication 71-1. The minimum height to be chosen is determined by one of the electrical characteristics given in the table, i.e. dry lightning impulse withstand voltage, wet power frequency withstand voltage and we
40、t switching impulse withstand voltage as applicable and according to the relevant insulation coordination requirements. The operating voltage is not specified because depending on service conditions, especially contamination, it cannot strictly be correlated with the height of the post insulator. Th
41、e composition of the post insulator, i.e. the number, the size and the positioning of insulator units is not specified. For a given height of a post insulator, however, the composition together with insulator profile and size and shape of metal parts can all affect the electrical performance of the
42、post insulator especially the wet switching impulse withstand voltage value. The rated switching impulse withstand voltage values are specified taking into account the above-mentioned facts as well as the high dispersion in wet switching impulse tests. However for many post insulator designs higher
43、switching impulse withstand voltage values are obtainable.BS3297-2:1993 4 BSI 04-2000 The rated withstand voltage requirements given in tables are for tests carried out on single post insulators in accordance with IEC Publication 168. With regard to this test arrangement the test conditions are favo
44、urable and may result in higher withstand voltages than in service applications. This applies in particular to complete disconnectors for which the actual withstand values may differ appreciably from those given in the tables. In these cases an insulator with a greater standard height may be chosen
45、or special stress control fittings may be used. 4 Mechanical characteristics Post insulators are standardized in mechanical strength classes based on values of the specified failing load in the bending test. These mechanical strength classes are as follows: a) Indoor post insulators of ceramic mater
46、ial or glass and with internal metal fittings Strength class2 2 000 N Strength class4 4 000 N Strength class8 8 000 N Strength class 16 16 000 N Strength class 25 25 000 N b) Indoor post insulators of organic material and with internal metal fittings Strength class2 2 000 N Strength class4 4 000 N S
47、trength class6 6 000 N Strength class8 8 000 N Strength class 10 10 000 N Strength class 16 16 000 N Strength class 25 25 000 N c) Outdoor cylindrical post insulators of ceramic material or glass and with internal metal fittings Strength class2 2 000 N Strength class4 4 000 N Strength class8 8 000 N
48、 Strength class 16 16 000 N Strength class 31,5 31 500 N d) Outdoor cylindrical post insulators of ceramic material or glass and with external metal fittings Strength class2 2 000 N Strength class4 4 000 N Strength class6 6000 N Strength class8 8 000 N Strength class 10 10 000 N Strength class 12,5
49、12 500 N Strength class 16 16 000 N Strength class 20 20 000 N Strength class 25 25 000 N Strength class 31,5 31 500 N Strength class 40 40 000 N e) Outdoor pedestal post insulators of ceramic material or glass Strength class A 3 000N to5 000 N Strength class B 5 000 N to7 500 N Strength class C 7 500 N to 12 000 N Strength class D 12 000 N to 18 000 N Strength class E 18 000 N to 30 000 N NOTEThe dimensions of outdoor cylindrical post insulators according to d) above are only specified for str
