BS-EN-50405-2006.pdf

BRITISH STANDARD BS EN 50405:2006 Railway applications Current collection systems Pantographs, testing methods for carbon contact strips The European Standard EN 50405:2006 has the status of a British Standard ICS 29.280 ? Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50405:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2006 © BSI 2006 ISBN 0 580 49613 9 National foreword This British Standard was published by BSI. It is the UK implementation of EN 50405:2006. The UK participation in its preparation was entrusted by Technical Committee GEL/9, Railway electrotechnical applications, to Subcommittee GEL/9/2, Rolling stock. A list of organizations represented on GEL/9/2 can be obtained on request to its secretary. 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 cannot confer immunity from legal obligations. WARNING This European Standard provides specifications for a number of standardized tests for the characteristics and integrity of pantograph carbon contact strips. It should be noted however, that no specific acceptance criteria are specified for passing the tests other than the requirement for shear strength. In some cases the acceptance criteria is specified as remaining “fit for purpose” and this term is not defined in the standard. It is the opinion of UK committee GEL/9/2 that none of the tests included in this standard will demonstrate the resistance to impact and wear properties of the carbon strip under test. This standard does not provide the ability to compare grades of carbon. GEL/9/2 advises that users should ensure that where necessary, values to be achieved are specified prior to use of the standard as part of a contract, or, if the user's own requirements are not to be stated, ensure that what is being procured is consistent with the application intended. GEL/9/2 is of the opinion that compliance with this standard alone will not necessarily ensure that contact strips are suitable for the purpose intended. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 50405 NORME EUROPÉENNE EUROPÄISCHE NORM August 2006 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels © 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50405:2006 E ICS 29.280 English version Railway applications - Current collection systems - Pantographs, testing methods for carbon contact strips Applications ferroviaires - Systèmes de captage de courant - Méthodes d'essais des bandes de frottement en carbone des pantographes Bahnanwendungen - Stromabnahmesysteme - Stromabnehmer für Oberleitungsfahrzeuge, Prüfverfahren für Kohleschleifstücke This European Standard was approved by CENELEC on 2006-03-01. 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, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50405:2006 - 2 - Foreword This European Standard was prepared by SC 9XB, Electromechanical material on board of rolling stock, of Technical Committee CENELEC TC 9X, Electrical and electronic applications for railways. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50405 on 2006-03-01. 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) 2007-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-03-01 _ Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI - 3 - EN 50405:2006 Content Page 1 Scope4 2 Normative references 4 3 Definitions4 4 Symbols and abbreviations.5 5 Tests.5 5.1 General.5 5.1.1 Type tests.5 5.1.2 Routine tests 5 5.2 Test procedures .5 5.2.1 Tests for the temperature characteristic of the carbon contact strip under rated current loading .5 5.2.2 Test for deflection and extension of the carbon contact strip under extremes of temperature7 5.2.3 Test for flexural characteristic of the carbon contact strip8 5.2.4 Test for shear strength of the contact strip.9 5.2.5 Test of autodrop detection sensor integral with contact strips.12 5.2.6 Test of mechanical fatigue resistance of the carbon contact strip.14 5.2.7 Test of the electrical resistance of the contact strip.13 Annex A (normative) List of tests15 Annex B (informative) Parameters to be specified by the customer.16 Figure 1 Arrangement of test device for testing temperature characteristic .6 Figure 2 Example of current supply connection7 Figure 3 High temperature test8 Figure 4 Preparation of samples.9 Figure 5 Example of suitable fixture for testing shear strength of carbon contact strip9 Figure 6 Example of testing configuration of shear strength test10 Figure 7 Typical impact test device.12 Figure 8 Air supply and monitoring equipment13 Figure 9 Test of electrical transfer resistance from the carbon contact surface to the supporting structure14 Figure 10 Connection scheme for test of electrical resistance14 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50405:2006 - 4 - 1 Scope This European Standard gives rules for testing methods for carbon contact strips. The purpose of this standard is to demonstrate that the carbon strip construction is fit for purpose. Not all tests may be relevant to some designs. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 9001 Quality management systems Requirements (ISO 9001) EN 50206-1 Railway applications Rolling stock Pantographs: Characteristics and tests Part 1: Pantographs for main line vehicles EN 50206-2 Railway applications Rolling stock Pantographs: Characteristics and tests Part 2 : Pantographs for metros and light rail vehicles EN 50367 Railway applications Current collection systems Technical criteria for the interaction between pantograph and overhead line (to achieve free access) IEC 60413 Test procedures for determining physical properties of brush materials for electrical machines 3 Definitions For the purposes of this document, the following terms and definitions apply. 3.1 carbon contact strip strip of carbon material, permanently attached to an integral supporting structure (carrier) but excluding bolted assemblies 3.2 shear strength stress at failure of the adhesion between carbon and the support structure 3.3 autodrop detection (ADD) sensor mechanism incorporated in the carbon contact strip to provide the indication for the pantograph automatic dropping device 3.4 flow continuity uninterrupted flow of air or other fluid 3.5 rated current loading current value defined by the manufacturer that the carbon strip is designed to sustain without degradation under the specified operating conditions Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI - 5 - EN 50405:2006 4 Symbols and abbreviations A designed area of adhesion (mm2) FS shear force (N) R resistance () s shear strength (N/mm2) 5 Tests 5.1 General There are two categories of tests: type tests, routine tests. The above tests are described in 5.1.1 to 5.1.2. Supplementary tests may be required if they have been specified in the customer specification and after agreement with the supplier. Annex A summarises the tests which shall be performed. 5.1.1 Type tests Type tests shall be performed on a single piece of product of a given design. Equipment in current manufacture shall be considered to have satisfied the type tests; if the manufacturer can provide certified reports of type tests already conducted on identical components, the type tests shall be considered to be complied with. 5.1.2 Routine tests Routine tests shall be carried out to verify that the properties of a product correspond to those measured during the type test. Routine tests shall be performed by the supplier on each equipment. 5.2 Test procedures 5.2.1 Tests for the temperature characteristic of the carbon contact strip under rated current loading 5.2.1.1 General The test aims to determine the temperature characteristic to stability of the carbon contact strip at the maximum designed current loading. Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50405:2006 - 6 - 5.2.1.2 Test method The carbon contact strip shall be fixed at one end and freely supported at the other end (see Figure 1). The current supply connection shall be made by clamping suitable interfaces to the vertical faces of the carbon, but not in contact with the carrier material (see Figure 2). The current take off shall be made at the normal design interface(s). Key 1 parallel clamp (steel) 2 carbon contact strip fixed end 3 temperature sensor 2 mm above carbon carrier interface 4 power supply Figure 1 Arrangement of test device for testing temperature characteristic Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI - 7 - EN 50405:2006 Key 1 current supply connection (steel, copper) Figure 2 Example of current supply connection The temperature shall be monitored adjacent to the current supply connection at a point 2 mm above the carbon / carrier interface. The maximum rated current loading shall be applied to the carbon contact strip until the monitored temperature remains constant and then for a further 30 minutes. The temperature shall be continuously recorded during the test as a temperature time characteristic. Test acceptance criteria: The carbon contact strip shall remain fit for purpose. The contact strip shall remain in accordance with drawing at room temperature. 5.2.2 Test for deflection and extension of the carbon contact strip under extremes of temperature 5.2.2.1 General The test aims to determine the vertical displacement and change in length of the carbon contact strip under extremes of temperature. 5.2.2.2 Test method 5.2.2.2.1 High temperature test This test may be carried out concurrently with the test described in 5.2.1. Under the steady state heated conditions of 5.2.1.2, the change of length of the carrier (l) and vertical displacement of the strip (h) from the room temperature condition shall be recorded (see Figure 3). Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50405:2006 - 8 - 2 h 1 3 l Key 1 carbon contact strip fixed 2 vertical displacement 3 change of length Figure 3 High temperature test 5.2.2.2.2 Low temperature test The contact strip shall be cooled by a suitable method until the temperature of the strip is -40 °C. The contraction and vertical displacement from the room temperature condition shall be recorded. Test acceptance criteria: The carbon contact strip shall remain fit for purpose. The contact strip shall remain in accordance with drawing at room temperature. 5.2.3 Test for flexural characteristic of the carbon contact strip 5.2.3.1 General The test aims to determine the flexural characteristic of the carbon contact strip at room temperature. 5.2.3.2 Test method The flexural characteristic is determined by three point bending of the complete contact strip when supported at each end of the strip along the longitudinal centreline of the contact strip and loaded vertically at the centre. The force shall be gradually applied until permanent deformation is recorded on a force-deflection chart. The effective stiffness shall be determined from the results of the test and the applied force at which permanent deformation is recorded. 5.2.4 Test for shear strength of the contact strip 5.2.4.1 General Definition of shear strength: s = Fs / A (N/mm2) This test shall demonstrate that the adhesion between carbon and supporting structure meets the minimum shear strength criteria at room temperature, at specified temperatures (criteria specified by the manufacturer) and thermal fatigue. The shear strength at failure of the specimen at room temperature shall exceed a minimum acceptable value or result in failure of the parent carbon material alone. Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:33:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI - 9 - EN 50405:2006 5.2.4.2 Test method 5.2.4.2.1 Test at room temperature Samples of the contact strip material shall be prepared in accordance with Figure 4: Key 1 carrier 2 carbon Figure 4 Preparation of samples A minimum of 3 samples shall be prepared from a production contact strip and shall include each end of the contact strip and the centre. Each sample shall be prepared to a preferable length of 30 mm. Each sample shall be installed in a suitable fixture (see Figure 5) in order that the applied shear force Fs is guided directly into the interface defined as area of