1、CENELEC EN*b0*305 i6 3404583 017.5768 391 35 EN BRITISH STANDARD Insulators for overhead lines with a nominal voltage Ceramic or glass insulator units for a.c. systems - Characteristics of insulator units of the cap and pin type I above 1 kV - The European Standard EN 60305 : 1996 has the status of
2、a British Standard I ICs 20.080.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW i0305 : 1996 EC 305 : 1995 CENELEC EN*bO*305 96 3404583 017.5969 228 BS EN 60305 : 1996 This British Standard, having been prepared under the direction of the Electrotechnicai Sector Board, was
3、published under the authority of the Standards Board and comes into effect on 15 August 1996 o BI 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee PEy36, Insulators for power systems, to Subcommittee PEL/36/2, Line in
4、sulators, upon which the foilowing bodies were represented: Association of Consultjng Engineers BEAMA Electrical Cable and Conductor Accessoy Manufacturers Association British Indushiai Ceramic Manufacturers Associon British Railways Board Electrical and Electronic Insulation Association (BEAMA Ltd.
5、) Electricity Association Amendments issued since publication The following BSI references relate to the work on this Standard: Committee reference PEy3612 Draft for comment 93/217038 DC ISBN O 580 26155 7 BS EN 60305 : 1996 Contents Committees responsible National foreword me Wide front cover ii Fo
6、reword Specification 1 Scope and object 2 Normative references 3 Mechanical and dimensional characteristics 4 Designation and marking 5 Tolerances - Annex ZA (normative) Nomiative references to international publications with their corresponding European publications 8 lbles 1 6 2 7 Figures 1 String
7、 insuiator unit with baii and socket couplings 6 2 String insulator unit with clevis and tongue couplings 7 Specified values of mechanical and dimensional characteristics for string insulator units with ball and socket couplings Specified values of mechanical and dimensional characteristics for stri
8、ng insulator units with clevis and tongue couplings O BSI 1996 i BSENm05: 1996 CENELEC EN*b0*305 96 3404583 0175971 98b National foreword This British Standard has been prepared by Subcommittee PEiLW2 and is the English language version of EN 60305 : 1996 Insulators for ouerhead lines with a nominal
9、 udtage above 1 kV - Ceramic or gh insulator units for a.c. systems - chamctemstics of inszutor units of the mp and pin twe, published by the European Committee for Eiectrotechnical Stanckmhation (CENELEC). It is identical with iEC 305 : 1995 published by the International Electrotechnid Commission
10、PC). The foreword of the EN makes reference to the date of withdrawal, dow, of the relevant nationai standard. In this case the relevant nationai standard is BS 137 : Part 2 : 1973 which wiil be withdrawn on 1W12-01. Cross-references Publication referred to HD 474 s1 Corresponding British Standard B
11、S 3288 Insulator and conductor$ttings for overhead power Part 3 : 1989 EmenSirmS of bail and socket couplings of strng insulator units Compliance with a British Standard does not of itself confer immunity from legal obligations. (IEC 120: 1984) lines CENELEC EN*bO*305 96 H 3404583 0175972 812 9 EURO
12、PEAN SIANDARD EN 60305 NORME EUR0PEE”E EUROPmHE NORM March 1996 ICs 29,080.10 Descriptors: Insulators, overhead lines, ceramic or glass insulators, insulator units of the cap and pin type English version Insulators for overhead lines with a nominal voltage above 1 kV Ceramic or glass insulator units
13、 for ac. systems Characteristics of insulator units of the cap and pin type (IEC 305 : 1995) Isolateurs pour lignes ariennes de tension nominale suprieure 1 kV Elments disolateurs en their values shall be agreed between purchaser and manufacturer, Ball and socket couplings are covered by IEC 120, cl
14、evis and tongue couplings by IEC 471 NOTE - For the definition of pollution levels see IEC 815. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edi
15、tions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain r
16、egisters of currently valid International Standards. IEC 120: 1984, Dimensions of ball and socket couplings of string insulator units IEC 383-1 : 1993, Insulators for overhead lines with a nominal voltage above 7 O00 V - Part 7: Ceramic or glass insulator units for a.c. systems - Definitions, test m
17、ethods and acceptance criteria IEC 471 : 1977, Dimensions of clevis and tongue couplings of string insulator units IEC 81 5: 1986, Guide for the selection of insulators in respect of polluted conditions 3 Mechanical and dimensional characteristics String insulator units of the cap and pin type are s
18、tandardized by the following specified characteristics: - electromechanical or mechanical failing load; - maximum nominal diameter of the insulating part; - nominal spacing; - minimum nominal creepage distance; - standard coupling. The corresponding values are indicated in tables 1 and 2. NOTES 1 Th
19、e following points merit attention for insulators for use in polluted areas. a) Even if the creepage distance is the same, the withstand voltage characteristics may change with shed shape of the insulators. b) Even if the string length is the same, the withstand voltage characteristics may decrease
20、with increasing insulator strength due to the lower efficiency of creepage distance for a larger average diameter. 2 IEC 815 gives details on the important parameters of shed profiles for antipollution insulators. 4 Designation and marking Insulators are designated in tables 1 and 2 by the letter U
21、followed by a number indicating the specified electromechanical or mechanical failing load in kilonewtons. The letter 6 or C which follows specifies a ball and socket or clevis and tongue, respectively. The following letter S or L, if present, specifies a short or long spacing. Long creepage distanc
22、e insulators for polluted areas are designated by a final letter P. IEC 383-1 specifies that insulators shall be marked with the specified electromechanical or mechanical failing load. This load may be indicated by using the first part of the designation given in the first column of tables 1 and 2:
23、For instance, the insulator may be marked U 160 for the units U 160 BS, U 160 BL and U 160 BLP. CENELEC EN*b0*305 76 = 3404583 0375976 468 W Page 5 EN 60305 : 1996 5 Tolerances Except for nominal spacing, tolerances for dimensions indicated in IEC 383-1 are applicable to all nominal values including
24、 maximum nominal diameter and minimum nominal creepage distance values given in tables 1 and 2. Nominal spacing tolerance shall be: ,O3 P+ 0,3) mm P being spacing expressed in millimetres. Page 6 EN 60306 : 1996 CENELEC EN*b0*305 96 m 3404583 0375977 3T4 CW-IEC I W Fa 0181 996 7400. BSI offers membe
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