BS-7733-1994 IEC-60826-1991.pdf
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1、BRITISH STANDARD BS 7733:1994 IEC 826:1991 (Incorporating Corrigendum September 1991) Guide to Loading and strength of overhead transmission lines Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7733:1994 Th
2、is British Standard, having been prepared under the direction of the Power Electrical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 April 1994 BSI 10-1999 The following BSI references relate to the work on this standard:
3、Committee reference PEL/17 Draft for comment 87/29345 DC ISBN 0 580 22818 5 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/17, upon which the fol
4、lowing bodies were represented: Aluminium Federation Association of Consulting Engineers BECCAMA (BEAMA Electrical Cable Conductor Accessory Manufacturers Association) British Non-Ferrous Metals Federation British Railways Board Department of Trade and Industry (Electricity Division) Electrical and
5、Electronic Insulation Association (BEAMA Ltd.) Electricity Association Overhead Transmission Line Contractors (BEAMA Ltd.) Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:58 GMT+00:00 2006, Uncontrol
6、led Copy, (c) BSI BS 7733:1994 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordiv Introduction1 Section 1. General 1.1Scope2 1.2Definitions2 1.3Symbols and abbreviations3 1.4Design basis6 1.5System design6 1.6Assessment of line reliability7 1.7Security requiremen
7、ts12 1.8Safety requirements12 Section 2. Design criteria 2.1General12 2.2Design criteria15 2.3Design criteria for towers18 2.4Design criteria for foundations18 2.5Design criteria for conductors and earth wires19 2.6Design criteria for insulators and hardware19 Section 3. Loadings 3.1General19 3.2Cli
8、matic loads, wind19 3.3Climatic loads, ice without wind31 3.4Climatic loads, combined wind and ice loadings38 3.5Loads for construction and maintenance44 3.6Loads for failure containment46 Section 4. Strength of components and limit states 4.1General47 4.2Components of transmission line systems48 4.
9、3Limit states of line components48 4.4Strength data of line components48 Section 5. Technical justifications 5.1Scope53 5.2Relation between load and strength53 5.3Effect of span dispersion on reliability57 5.4Strength coordination of line components57 5.5Number of components subjected to maximum loa
10、d intensity59 Annex A (informative) The effect of span dispersion on load-strength relationship: calculation of span use factor61 Annex B (informative) The Beta distribution function65 Annex C (informative) Statistical distribution of maximum yearly wind velocity and ice load66 Annex D (informative)
11、 Characteristic strength of components68 Annex E (informative) Determination of the meteorological reference wind velocity70 Annex F (informative) Gradient wind speeds71 Annex G (informative) Temperature measurements and their interpretation71 Annex H (informative) Types of icing72 Licensed Copy: Lo
12、ndon South Bank University, London South Bank University, Fri Dec 08 12:30:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7733:1994 ii BSI 10-1999 Page Annex J (informative) Atmospheric icing process and terrain influences73 Annex K (informative) Guidelines for the implementation of an ice observa
13、tion programme74 Figure 1 Relations between load and strength8 Figure 2 Methodology for the design of transmission lines14 Figure 3 Ground roughness A25 Figure 4 Ground roughness B25 Figure 5 Ground roughness C26 Figure 6 Ground roughness D26 Figure 7 Determination of the apparent length of 2 Lm of
14、the two adjacent spans on the considered support27 Figure 8 Gust factor of insulators and towers: Gi, Gt28 Figure 9 Definition of the solidity ratio29 Figure 10 Overall normal drag coefficients for rectangular towers composed of flat-sided members CxT29 Figure 11 Overall normal drag coefficients for
15、 rectangular towers composed of circular section members CxT30 Figure 12 Value of CxTc drag coefficient of cylindrical elements having a large diameter, as a function of Reynolds number Re31 Figure 13 Factor related to the influence of the number of years of observation of ice33 Figure 14 Factor rel
16、ated to the influence of conductor diameter34 Figure 15 Variation of Kh with the height of conductors above the ground34 Figure 1636 Figure 1737 Figure 18 Cases of combined ice-wind loadings given as an indication39 Figure 19 Factor related to the influence of the number of years with observation of
17、 wind combined with ice41 Figure 20 Definition of cylindrical ice shape42 Figure 21 Application of longitudinal loads45 Figure 2246 Figure 2347 Figure 24 Diagram of transmission line system48 Figure 25 Diagram of a transmission line diagram49 Figure 26 Values of Pf = (1 Ps) for various distributions
18、 of Q and R for T = 50 years55 Figure 27 Values of Pf = (1 Ps) for various distributions of Q and R for T = 150 years56 Figure 28 Values of Pf = (1 Ps) for various distributions of Q and R for T = 500 years56 Figure B.1 Different forms of the Beta distribution66 Figure E.1 Relationship between meteo
19、rological wind velocities at a height of 10 m71 Figure K.175 Table 1 Typical strength coordination7 Table 2 Reliability corresponding to various assumptions of load and strength11 Table 3 Relationship between reliability levels and return periods of design loads11 Licensed Copy: London South Bank Un
20、iversity, London South Bank University, Fri Dec 08 12:30:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7733:1994 BSI 10-1999iii Page Table 4 Reliability levels of transmission lines13 Table 5 Design conditions15 Table 6 Range of spatial coverage of maximum load intensity (given in number of tower
21、s)17 Table 7 Number of towers subjected to maximum load intensity17 Table 8 Strength factor N related to the number N of components subjected to the critical load intensity17 Table 9 Values of S18 Table 10 Definition of ground roughness20 Table 11 Values of high wind velocity21 Table 12 Values of KR
22、 for different ground roughness21 Table 13 Statistical parameters of ice loads32 Table 14 Values of ice load coefficient Kg33 Table 15 Return period of combined events38 Table 16 Combined wind and ice loading conditions39 Table 17 Values of KL and KH40 Table 18 Values of factors KiH and KiL40 Table
23、19 Drag coefficients of ice-covered conductors42 Table 20 Damage and failure limits of supports50 Table 21 Damage and failure limits of foundations51 Table 22 Damage and failure limits of conductors and ground wires52 Table 23 Damage and failure limits of interface components52 Table 24 Strength par
24、ameters of supports52 Table 25 Strength parameters of foundations (in uplift)53 Table 26 Strength parameters of interface components53 Table 27 Strength parameters of conductors and ground wires53 Table 28 Values of ratio of average strengths (RAS) and S required to insure that component R2 will fai
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