BS EN 50341-1-2001 交流电压 45 kV以上架空电力线.通用规范.pdf

BRITISH STANDARD BS EN 50341-1:2001 Overhead electrical lines exceeding AC 45 kV Part 1: General requirements Common specifications The European Standard EN 50341-1:2001 has the status of a British Standard ICS 29.240.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 50341-1:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 25 April 2002 BSI 25 April 2002 ISBN 0 580 39624 X National foreword This British Standard is the official English language version of EN 50341-1:2001. The UK participation in its preparation was entrusted to Technical Committee PEL/11, Overhead lines, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible 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 front cover, the EN title page, pages 2 to 234, 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. DateComments EUROPEAN STANDARDEN 50341-1 NORME EUROPENNE EUROPISCHE NORMOctober 2001 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 2001 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50341-1:2001 E ICS 29.240.20 English version Overhead electrical lines exceeding AC 45 kV Part 1: General requirements - Common specifications Lignes lectriques ariennes dpassant AC 45 kV Partie 1: Rgles gnrales - Spcifications communes Freileitungen ber AC 45 kV Teil 1: Allgemeine Anforderungen - Gemeinsame Festlegungen This European Standard was approved by CENELEC on 2001-01-01. 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 standards 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 notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EN 50341-1:2001- 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 11, Overhead electrical lines exceeding AC 1 kV (DC 1,5 kV). The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50341-1 on 2001-01-01. The following dates were fixed: -latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop)2002-05-01 -latest date by which the national standards conflicting with the EN have to be withdrawn(dow)2004-01-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given for information only. In this standard, annexes E, G, J - catenary systems of electrified railways. 2Definitions, symbols and references 2.1Definitions For the purposes of this European Standard, the terms and definitions given in the International Vocabulary (IEC 60050) Chapters 441, 466, 471, 601 and 604 and the following apply. In order to achieve a better understanding of the definition of certain terms used in this standard, some words in the definitions are written in italics. The definitions of these words are also given in this subclause. 2.1.1 action a) force (load) applied to the (mechanical) system (direct action). NOTEAn action can be permanent, variable or accidental. b) an imposed or constrained deformation or an imposed acceleration caused for example, by temperature changes, moisture variation, uneven settlement or earthquakes (indirect action) 2.1.2 accidental action action, usually of short duration, which is unlikely to occur with a significant magnitude during the design working life NOTEAn accidental action can be expected in many cases to cause severe consequences unless special measures are taken. - 15 -EN 50341-1:2001 2.1.3 bonding conductor conductor providing equipotential bonding 2.1.4 box values numerical values identified by ”box values” are given as indication. Other values may be specified by NCs in NNAs 2.1.5 characteristic resistance value of mechanical resistance calculated using characteristic values of material properties. These values may be obtained from ENV 1992-1-1, ENV 1993-1-1 or ENV 1995-1-1 2.1.6 characteristic value of a material property value of a material property having a prescribed probability of not being attained in a hypothetical unlimited test series. This value generally corresponds to a specified fraction of the assumed statistical distribution of the particular property of the material. A nominal value is used as the characteristic value in some circumstances 2.1.7 characteristic value of an action principal representative value of an action. In so far as this characteristic value can be fixed on statistical bases, it is chosen so as to correspond to a prescribed probability of not being exceeded on the unfavourable side during a reference period taking into account the design working life of the system and the duration of the design situation 2.1.8 clearance distance between two conductive parts along a string stretched the shortest way between these conductive parts IEV 441-17-31 2.1.9 coefficient of variation ratio of the standard deviation to the mean value 2.1.10 combination of actions set of design values of actions used for the verification of the structural reliability for a limit state under the load case 2.1.11 combination factor for an action factor used for the determination of the combination value for an action EN 50341-1:2001- 16 - 2.1.12 combination value for an action value associated with the use of combinations of actions to take account of a reduced probability of simultaneous occurrence of the most unfavourable values of several independent actions. Value obtained by multiplying the characteristic value of an action by the combination factor for an action or, in special circumstances, by direct determination 2.1.13 component one of the different principle parts of the overhead electrical line system having a specified purpose. Typical components are supports, foundations, conductors, insulator strings and hardware 2.1.14 conductor (of an overhead line) one or more aluminium, aluminium alloy, copper, zinc coated or aluminium clad steel wires, or combinations thereof, wrapped together which collectively have the function of conducting an electrical current IEV 466-01-15: A wire or combination of wires not insulated from one another, suitable for carrying an electric current 2.1.15 corona luminous discharge due to ionisation of the air surrounding an electrode caused by a voltage gradient exceeding a certain critical value NOTEElectrodes may be conductors, hardware, accessories or insulators. 2.1.16 current to earth current flowing to earth via the impedance to earth 2.1.17 design resistance structural resistance associating all structural properties with the respective design value of the material properties 2.1.18 design situation set of physical conditions representing a reference period for which the design will demonstrate that the relevant limit states are not exceeded 2.1.19 design value of a material property value obtained by dividing the characteristic value of a material property by the partial factor for the material property or, in special circumstances, by direct determination 2.1.20 design value of an action value obtained by multiplying the characteristic value of an action by the partial factor for an action - 17 -EN 50341-1:2001 2.1.21 design working life assumed period for which a structure is to be used for its intended purpose with anticipated maintenance but without substantial repair being necessary 2.1.22 dynamic action action which causes significant acceleration of the structure or structural elements 2.1.23 earth term for the earth as a location as well as for earth as a conductive mass, for example types of soil, humus, loam sand, gravel and stone 2.1.24 earth electrode conductor which is embedded in the earth and conductively connected to the earth, or a conductor which is embedded in concrete, which is in contact with the earth via a large surface (for example foundation earth electrode) 2.1.25 earth fault conductive connection caused by a fault between a phase conductor of the main circuit and earth or an earthed part. The conductive connection can also occur via an arc. Earth faults of two or several phase conductors of the same electrical system at different locations are designated as double or multiple earth faults 2.1.26 earth fault current current which flows from the main circuit to earth or earthed parts if there is only one earth fault point at the fault location (earth fault location) 2.1.27 earth potential rise voltage between an earthing system and reference earth 2.1.28 earth rod earth electrode which is generally buried or driven in vertically to a greater depth. For example it can consist of a pipe, round bar or other profile material 2.1.29 earth surface potential voltage between a point on the earth surface and reference earth 2.1.30 earthing all means and measures for making a proper conductive connection to earth EN 50341-1:2001- 18 - 2.1.31 earthing conductor conductor which connects that part of the installation which has to be earthed to an earth electrode as far as it is laid outside of the soil (earth wire) or buried in the soil 2.1.32 earthing system locally limited electrical system of conductively connected earth electrodes or earthing conductors and of bonding conductors, or metal parts effective in the same way, for example tower footings, armourings, metal cable sheaths 2.1.33 earth wire a conductor connected to earth at some or all supports, which is suspended usually but not necessarily above the line conductors to provide a degree of protection against lightning strokes IEV 466-10-25 NOTEAn earth wire may also contain metallic wires for telecommunication purposes. 2.1.34 effective field strength square root of the sum of the squares of the three root mean square (r.m.s.) mutually orthogonal components of the field 2.1.35 effect of action effect of actions on structural elements for example: internal force, moment, stress, and strain. The design value of the effect of action is the total effect of the respective design values of actions 2.1.36 electric field the electric field created in the vicinity of a charged conductor is the vector quantified by the electric field strength, E. This quantity is the force exerted by an electric field on a unit charge and is measured in volts per metre (V/m) 2.1.37 element one of the different parts of a component. For example, the elements of a steel lattice tower are steel angles, plates and bolts 2.1.38 equipotential bonding conductive connection between conductive parts, to reduce the potential differences between these parts 2.1.39 exclusion limit probability of a variable value of a variable taken from its distribution function and corresponding to an assigned probability of not being exceeded - 19 -EN 50341-1:2001 2.1.40 external clearances all clearances which are not internal clearances. They include those to the ground plane, roads, buildings and installations (if they are permitted by National Statute) and to objects which can be on any of these 2.1.41 failure (structural) state of a structure whose purpose is terminated, i.e. in which a component has failed by excessive deformation, loss of stability, overturning, collapse, rupture, buckling, etc. 2.1.42 fixed action action which has a fixed distribution over the structure such that the magnitude and direction of the action are determined unambiguously for the whole structure if this magnitude and direction are determined at one point on the structure 2.1.43 foundation earth electrode conductor which is embedded in concrete and is in contact with the earth via a large surface 2.1.44 free action action which may have any spatial distribution over the structure within given limits 2.1.45 frequently occupied area area which people will occupy so frequently that risk of simultaneous earth fault must be considered (examples: playgrounds, pavements of public roads, close vicinity of residences, etc.) NOTEUtilities should define these areas. 2.1.46 highest system voltage highest (r.m.s.) value of voltage which occurs at any time and at any point of the overhead line under normal operating conditions and for which the overhead electrical line shall be designed 2.1.47 horizontal earth electrode electrode which is generally buried at a low depth. For example it can consist of strip, round bar or stranded conductor and can be carried out as radial, ring or mesh earth electrode or as a combination of these 2.1.48 impedance to earth of an earthing system impedance between the earthing system and reference earth EN 50341-1:2001- 20 - 2.1.49 internal clearance clearance between phase conductors and earthed parts such as steel structural elements and earth wires and also those between phase conductors. Also included are clearances to other circuits on the same support 2.1.50 limit state (structural) state beyond which the structure no longer satisfies the de