BS EN 61394:2011 Incorporating corrigendum August 2012 BSI Standards Publication Overhead lines — Requirements for greases for aluminium, aluminium alloy and steel bare conductors NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide™ BS EN 61394:2011 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 61394:2011 It is identical to IEC 61394:2011, incorporating corrigendum August 2012 It supersedes PD IEC 61394:1997 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee GEL/7, Overhead electrical conductors A list of organizations represented on this committee 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 © The British Standards Institution 2013 Published by BSI Standards Limited 2013 ISBN 978 580 80555 ICS 29.060.20; 29.240.20; 75.100 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2012 Amendments/corrigenda issued since publication Date Text affected Implementation of IEC corrigendum August 2012: Table modified BS EN 61394:2011 EN 61394 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM November 2011 ICS 29.060.20; 29.240.20 English version Overhead lines Requirements for greases for aluminium, aluminium alloy and steel bare conductors (IEC 61394:2011) Lignes aériennes Exigences pour les graisses pour conducteurs nus en aluminium, en alliage d'aluminium et en acier (CEI 61394:2011) Freileitungen Anforderungen für Fette für blanke Leiter aus Aluminium, Aluminiumlegierung und Stahl (IEC 61394:2011) This European Standard was approved by CENELEC on 2011-11-16 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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, 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 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels © 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 61394:2011 E BS EN 61394:2011 EN 61394:2011 -2- Foreword The text of document 7/609/FDIS, future edition of IEC 61394, prepared by IEC/TC "Overhead electrical conductors" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61394:2011 The following dates are fixed: • • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting with the document have to be withdrawn (dop) 2012-08-16 (dow) 2014-11-16 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights Endorsement notice The text of the International Standard IEC 61394:2011 was approved by CENELEC as a European Standard without any modification BS EN 61394:2011 -3- EN 61394:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications 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 NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies Publication Year Title EN/HD Year IEC 60068-2-11 + corr December 1981 1999 Environmental testing Part 2: Tests - Test Ka: Salt mist EN 60068-2-11 1999 ISO 2137 2007 Petroleum products and lubricants Determination of cone penetration of lubricating greases and petrolatum - - ISO 2176 1995 Petroleum products - Lubricating grease Determination of dropping point - - BS EN 61394:2011 –2– 61394 © IEC:2011(E) CONTENTS FOREWORD Scope Normative references Designation system Requirements for grease Tests 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 Annex A Classification of tests 5.1.1 Type tests 5.1.2 Sample tests Preconditioning of samples 5.2.1 Type A products 5.2.2 Type B products 5.2.3 Products taken from a conductor Drop point High temperature stability (Type A products only) Penetrability test Low-temperature adherence Acidity/alkalinity (type B grease only) Ageing 5.8.1 Preconditioning Corrosion tests Stability of grease on conductor at high temperature Stability of grease on conductor under short-circuit (normative) Acidity or alkalinity test method for type B grease 11 Annex B (normative) Sample preparation and test procedure for ageing test 13 Annex C (normative) Stability of grease on conductor at high temperature 16 Annex D (normative) Stability of grease complete conductor under short-circuit 17 Bibliography 18 Figure – Corrosion coupons 10 Figure B.1 – Coupon for type A grease 13 Figure B.2 – Coupon for type B grease 14 Table – Classification of tests Table A.1 – Acidity or alkalinity index formula 12 BS EN 61394:2011 61394 © IEC:2011(E) –3– INTERNATIONAL ELECTROTECHNICAL COMMISSION OVERHEAD LINES – REQUIREMENTS FOR GREASES FOR ALUMINIUM, ALUMINIUM ALLOY AND STEEL BARE CONDUCTORS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees) The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”) Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter 5) IEC itself does not provide any attestation of conformity Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity IEC is not responsible for any services carried out by independent certification bodies 6) All users should ensure that they have the latest edition of this publication 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications 8) Attention is drawn to the Normative references cited in this publication Use of the referenced publications is indispensable for the correct application of this publication 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights IEC shall not be held responsible for identifying any or all such patent rights International Standard IEC 61394 has been prepared by IEC technical committee 7: Overhead electrical conductors This first edition of IEC 61394 cancels and replaces the first edition of technical specification IEC/TS 61394 published in 1997 It constitutes a technical revision and now has the status of an International Standard The text of this standard is based on the following documents: FDIS Report on voting 7/609/FDIS 7/613/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table This publication has been drafted in accordance with the ISO/IEC Directives, Part BS EN 61394:2011 –4– 61394 © IEC:2011(E) The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication At this date, the publication will be • • • • reconfirmed, withdrawn, replaced by a revised edition, or amended IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents Users should therefore print this document using a colour printer A bilingual version of this publication may be issued at a later date BS EN 61394:2011 61394 © IEC:2011(E) –5– OVERHEAD LINES – REQUIREMENTS FOR GREASES FOR ALUMINIUM, ALUMINIUM ALLOY AND STEEL BARE CONDUCTORS Scope This International Standard specifies the requirements and tests of greases designed for corrosion protection of bare overhead conductors 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 IEC 60068-2-11:1981, Basic environmental testing procedures – Part 2-11: Tests – Test Ka: Salt mist lSO 2137:2007, Petroleum products and lubricants – Determination of cone penetration of lubricating greases and petrolatum ISO 2176:1995, Petroleum products – Lubricating grease – Determination of dropping point Designation system Greases shall be designated θ Aθ or θ Bθ where A and B define the type of grease as follows: – type A: products generally applied in the cold state, for example greases: semi-solid or solid products consisting essentially of a stabilized mixture of mineral or synthetic oil and thickeners such as metal soaps or inorganic compounds; – type B: products generally applied in the hot state, for example petrolatum: semi-solid, or solid products made up essentially of microcrystalline waxes associated with small quantities of mineral oil and organic additives; – θ is the lowest temperature in °C below °C at which the grease will perform the requirement of protection of the conductor from atmospheric corrosion; – θ is the highest temperature, in °C, at which the grease will perform to this requirement (achieve specified drop point or high temperature stability) Examples: − 20A150 − 20B110 type A grease with a temperature θ of -20 °C and θ of 150 °C type B grease with a temperature θ of -20 °C and θ of 110 °C The grease supplier shall provide a unique identifier for its grease, and shall retain details of its composition for future reference The composition shall include manufacturing tolerance and shall remain unchanged while the grease is marketed under this specific identifier BS EN 61394:2011 –6– Requirements for grease BS EN 61394:2011 61394 © IEC:2011(E) IEC 61394 (First edition – 2011) lines – atmospheric corrosion in service and The grease shall protect overhead bareOverhead conductors from Requirements for greases for in storage The grease shall remain in the conductor foraluminium, the specified conditions operation –6– 61394 © of IEC:2011(E) aluminium alloy and steel bare conductors The grease shall meet the requirements as described in this standard Requirements for grease Tests CORRIGENDUM The grease shall protect overhead bare conductors from atmospheric corrosion in service and in The greaseofshall 5.1storage Classification testsremain in the conductor for the specified conditions of operation The grease shall meet the requirements as described in this standard 5.1.1 Type tests Tests Type tests are intended to verify the main characteristics of a grease which depend mainly on its composition They are carried out once for a supplier's specific product and then subsequently repeatedofwhen 5.1 Classification teststhe composition of the grease has changed 5.1.1 5.1.2 Type tests Sample tests Tabletests – Classification teststhe main characteristics of a grease which depend mainly on Type areare intended toofverify Sample tests intended to guarantee the quality of the grease and compliance with the its composition They are carried out once for a supplier's specific product and then requirements of this standard Replace the existing Table with the following new Table: subsequently repeated when the composition of the grease has changed 5.1.2 Sample tests Table – Classification of tests Type tests Type tests Sample Sample tests tests Sample tests are intended to guarantee the quality of the grease and compliance with the Test Test Type A Type B Type A Type B requirements of this standard Type A Type B Type A Type B Drop point Drop point Table High temperature stability X Low temperatureTest adherence Penetrability Acidity/alkalinity Drop point Low temperature adherence Ageing High temperature stability Acidity/alkalinity Stability on conductor Penetrability Stability on conductor (short-circuit) Ageing Low temperature adherence a If requested by the purchaser Acidity/alkalinity Corrosion test Ageing Stability on conductor (high temperature) Stability on conductor Preconditioning of samples Stability on conductor (short circuit) Stability on conductor (short-circuit) 5.2.1 a X X – Classification of tests X High temperature stability Penetrability 5.2 X Type A products XX X Type tests X X TypeXA Type BX X XX X X X X X a a X X X a a X X X X X X X Xa X a a a a a a X X X X X X X X Sample tests Type A X X Type B X X X X X a a Ifbyrequested If requested the purchaser by the purchaser Type A grease delivered with an excess of oil on the surface shall not be acceptable Excess oil on the surface of the product after storage shall be removed If necessary, the product shall mixed prior to carrying out the measurements 5.2 be Preconditioning of samples 5.2.1 5.2.2 A products Type B Typeproduct A grease delivered withbetween an excess shall not be acceptable Excess The shall be heated 10 of °Coil to on 20 the °C surface above the temperature at which melting oil on the surface of the product after storage shall be removed If necessary, the product occurs, and maintained at this temperature for 30 The quantity necessary for carrying out shalltests be mixed prior to carrying outtest the containers measurements the shall be poured into the and allowed to cool at ambient temperature for a period of at least 24 h 5.2.2 Type B products 5.2.3 Products taken from a conductor The product shall be heated between 10 °C to 20 °C above the temperature at which melting occurs,the and maintained this temperature 30 The necessary carrying out When product to be at tested is taken fromfor a conductor, noquantity preconditioning is for allowed the tests shall be poured into the test containers and allowed to cool at ambient temperature for a period of at least 24 h August 2012 5.2.3 Products taken from a conductor When the product to be tested is taken from a conductor, no preconditioning is allowed 5.2.2 Type B products The product shall be heated between 10 °C to 20 °C above the temperature at which BS ENmelting 61394:2011 occurs, and maintained at this temperature for 30 The quantity necessary for carrying out the tests shall be poured into the test containers 61394 © IEC:2011(E) – – and allowed to cool at ambient temperature for a period of at least 24 h 5.3 Drop point 5.2.3 Products taken from a conductor BS EN 61394:2011 5.3.1 The determination of the drop point shall be made using the method given in ISO 2176 When the product to be tested is taken from a no preconditioning is allowed 61394 © IEC:2011(E) – conductor, 7– 5.3.2 When tested in accordance with 5.3.1, the minimum value of determinations shall be 5.3 greaterDrop than point or equal to θ Type A products may not have a well defined drop point, in which case the tests shall be stopped when the temperature reaches (θ + 20) °C 5.3.1 The determination of the drop point shall be made using the method given in ISO 2176 5.4 High temperature stability (Type A products only) 5.3.2 When tested in accordance with 5.3.1, the minimum value of determinations shall be products may not have a well defined greaterThe than equal to θshall Type 5.4.1 oilorseparation be A determined using the method given in IPdrop 121,point, after in hwhich at a + 20) °C case the tests shall be stopped when the temperature reaches (θ temperature of θ 5.4 stability with (Type A products only) quantity of oil separated shall not 5.4.2 High Whentemperature tested in accordance 5.4.1, the maximum exceed 0,2 % by mass 5.4.1 The oil separation shall be determined using the method given in IP 121, after h at a temperature of θ 5.5 Penetrability test 5.4.2 A When tested in accordance 5.4.1, the the maximum quantity of ISO oil separated shall 5.5.1 sample of grease shall bewith tested using method given in 2137, using a not full exceed 0,2 % by mass scale cone, at a temperature of 25 °C 5.5 Penetrability test 5.5.1.1 Type A products 5.5.1 A grease isshall be in tested using the method in ISO 2137, using aforfull When thesample type Aofproduct tested accordance with 5.5.1, given the mean value obtained a scale cone, at a temperature of 25 °C type test shall be greater than or equal to 70 units × 0,1 mm Results obtained from sample tests shall not vary from the value obtained from the type test by more than ± 20 % 5.5.1.1 Type A products 5.5.1.2the type TypeABproduct products When is tested in accordance with 5.5.1, the mean value obtained for a type test shall be greater than or equal to 70 units 0,1 mm obtainedfor from sample When the type B product is tested in accordance with× 5.5.1, theResults value obtained a type test tests shall not vary from the value obtained from the type test by more than ± 20 % shall be between 120 and 180 × 0,1 mm Results obtained from sample tests shall not vary from the value obtained from the type test by more than ± 20 % 5.5.1.2 Type B products 5.6 Low-temperature When the type B product adherence is tested in accordance with 5.5.1, the value obtained for a type test shall be between 120 and 180 × 0,1 mm Results obtained from sample tests shall not vary 5.6.1 An aluminium coupon measuring 100 mm × 100 mm × (1 ± 0,1) mm shall be coated with from the value obtained from the type test by more than ± 20 % a (0,50 ± 0,05) mm thick film of the product on one side and then maintained, along with a 25 mm mandrel, at a temperature less or equal to θ for h 5.6 Low-temperature adherence 5.6.2 The coupon with the coated side outside of the mandrel shall then be immediately bent 5.6.1 An aluminium coupon measuring 100 mm × 100 mm × (1 ± 0,1) mm shall be coated with to an angle between 100 ° and 120 ° around the mandrel The folding time of the coupon is a (0,50 ± 0,05) mm thick film of the product on one side and then maintained, along with a s 25 mm mandrel, at a temperature less or equal to θ for h 5.6.3 When tested in accordance with 5.6.1 and 5.6.2, the product shall remain adhering to 5.6.2 The coupon with the coated side outside of the mandrel shall then be immediately bent the coupon with no evidence of cracking or flaking when examined by the naked eye or with to an angle between 100 ° and 120 ° around the mandrel The folding time of the coupon is normal corrective lenses s 5.7 Acidity/alkalinity (type B grease only) 5.6.3 When tested in accordance with 5.6.1 and 5.6.2, the product shall remain adhering to the withset-up no evidence of cracking or flaking whenA.examined by the naked eye or with 5.7.1coupon The test and method is described in Annex normal corrective lenses 5.7.2 When tested in accordance with 5.7.1, the acidity or alkalinity of the sample before 5.7 B grease ageingAcidity/alkalinity shall be less than (type or equal to 2,0 only) 5.7.1 The test set-up and method is described in Annex A 5.7.2 When tested in accordance with 5.7.1, the acidity or alkalinity of the sample before ageing shall be less than or equal to 2,0 BS EN 61394:2011 –8– 5.8 61394 © IEC:2011(E) Ageing 5.8.1 Preconditioning 5.8.1.1 Type A grease No preconditioning is required for Type A grease 5.8.1.2 Type B grease A suitable quantity of grease shall be heated to a temperature of 20 °C above the temperature at which melting occurs, and maintained for 168 h 5.8.2 Sample preparation shall be in accordance with the procedure described in Annex B After ageing, the metal coupons with grease shall be subjected to the corrosion test The grease in the cups shall be subjected to the penetrability test as described in 5.5, as well as the acidity/alkalinity as described in 5.7 5.8.3 When tested in accordance with 5.8.2, the mean penetrability value shall not differ from the type test mean value by more than ± 20 % The acidity/alkalinity index shall be less than or equal to 2,5 5.9 Corrosion tests 5.9.1 The coupons shall be prepared in accordance with 5.8 They shall be positioned with an angle of (20 ± 2) ° in a suitable chamber and then be subjected to the following: − seven 24 h cycles in a sulphurous atmosphere For the first h of each cycle, the chamber shall have a relative humidity greater than 90 % and shall contain 0,067 % of sulphur dioxide by volume, at a temperature of (40 ± 3) °C For the remaining 16 h, the chamber door shall be open to the laboratory atmosphere − 168 h in a water spray solution with % of NaCl by mass at a temperature of (35 ± 1) °C in accordance with IEC 60068-2-11 5.9.2 The coupons shall be examined after the grease has been removed using a suitable solvent and the coupons with the lowest and highest degree of corrosion in the evaluation area (see Annex B) shall both be discarded There shall only be a limited number of pits and a limited spread of corrosion from these pits in the central part of the remaining coupon 5.9.3 The degree of corrosion on the remaining coupon is assessed by means of a grading index based on the corrosion coupons shown in Figure 5.9.4 When tested in accordance with 5.9.1, the coupon shall have a grading index greater than or equal to 5.10 Stability of grease on conductor at high temperature 5.10.1 This test is performed at the request of the purchaser only 5.10.2 A sample of conductor, selected by the user, shall be filled with grease in accordance with the appropriate IEC conductor specification The sample shall be subjected to the test procedure as described in Annex C The maximum operating temperature, θ , shall be defined by the purchaser 5.10.3 When tested in accordance with 5.10.2, the temperature θ A , as defined in Annex C, shall be not less than θ BS EN 61394:2011 61394 © IEC:2011(E) 5.11 –9– Stability of grease on conductor under short-circuit 5.11.1 This test is performed at the request of the purchaser only 5.11.2 A sample of conductor, selected by the user, shall be filled with grease in accordance with the appropriate IEC conductor specification The sample shall be subjected to the test procedure as described in Annex D The withstand temperature, θ , shall be defined by the purchaser 5.11.3 When tested in accordance with 5.11.2, the sample shall meet the acceptance criteria as agreed upon before the test between the supplier and the purchaser BS EN 61394:2011 – 10 – 61394 © IEC:2011(E) IEC Figure – Corrosion coupons 2128/11 BS EN 61394:2011 61394 © IEC:2011(E) – 11 – Annex A (normative) Acidity or alkalinity test method for type B grease A.1 General The acidity or alkalinity of a grease is measured by comparison with a normalised base, and neutrality determined by colour indicator change A.2 Reagents − Toluene, minimum 99,5 % by volume − Ethanol, 96 % by volume − Alkaline blue solution – 0,1 g alkaline blue in 100 ml of ethanol 96 % by volume − Potassium hydroxide 0,1 mol/l (or 5,61 mg/ml) solution in ethanol 96 % by volume − Hydrochloric acid 0,1 mol/l solution in ethanol 96 % by volume A.3 Equipment − Glass conical flask − Weighing device − Glass measuring burette A.4 Procedure a) Prepare approximately g of the grease to be tested b) Weigh the sample with an accuracy of 0,001 g c) Place the sample in the conical flask d) Add 60 ml of toluene e) Add 40 ml of ethanol f) Add ml of alkaline blue solution g) If the grease is alkaline, acidify the solution with ml of hydrochloric acid 0,1 mol/l solution in ethanol h) Shake the mixture vigorously i) Using the burette, add the potassium hydroxide solution progressively into the flask, shaking vigorously j) When the colour indicator changes colour (from blue to pink) note the volume of potassium hydroxide solution used, n A.5 Calculations The acidity or alkalinity index is given by the formula in Table A.1 BS EN 61394:2011 – 12 – 61394 © IEC:2011(E) Table A.1 – Acidity or alkalinity index formula Acidity index Acidic grease Alkaline grease Alkalinity index n × 5,61 m (5 − n ) × 5,61 m where n is the volume of potassium hydroxide solution used, ml: 5,61 is the concentration of the hydroxide solution (0,1 mol/l): m is the mass of grease sample, g BS EN 61394:2011 61394 © IEC:2011(E) – 13 – Annex B (normative) Sample preparation and test procedure for ageing test B.1 Preparation of metal coupons Three steel coupons approximately 100 mm × 100 mm × (2 ± 0,1) mm, shall be electro galvanized from a minimum zinc thickness of 2,8 µm to a maximum of 3,75 µm The face which is not to be used in the test shall be covered with a suitable adhesive coating capable of withstanding the ageing cycles and salt spray of the corrosion test The quality of the surface of the coupons shall be examined carefully, and any imperfections recorded and taken into account by agreement between the grease purchaser and the grease supplier B.2 Type A grease A layer of grease shall be applied to the uncovered surface of each coupon to a uniform thickness of (100 ± 10) µm A suggested method to achieve this is illustrated in Figure B.1 where strips of adhesive tape 10 mm wide by (100 ± 10) µm thick are applied to two opposite sides of each coupon A slight excess of grease is applied uniformly over the whole surface, and the excess removed by sliding a straight edge over the strips of tape The aim shall be to produce a smooth, uniform surface without imperfections or air entrapment This may be achieved by preheating the straight edge Any remaining imperfections shall be recorded and taken into account by agreement between the grease purchaser and the grease supplier 100 ± 20 Attachment hole 20 25 Evaluation area 100 ± 15 10 Adhesive tape 10 IEC 2129/11 Dimensions in millimetres Note Tolorance ± mm unless otherwise indicated Figure B.1 – Coupon for type A grease BS EN 61394:2011 – 14 – B.3 61394 © IEC:2011(E) Type B grease Metal coupons, as shown in Figure B.2, shall be immersed in a bath of molten grease, suspended from an attachment hole located in its corner In order to obtain the required uniform thickness of (100 ± 10) µm in the central portion of the coupon, the following parameters should be determined by trials: − the temperature of the bath, which may be between 10 °C to 30 °C above θ m ; the duration of immersion in the grease; − the vertical draining time after removal − The coupon shall be withdrawn uniformly from the bath within approximately 0,5 s and the thickness of grease in the upper portion of the evaluation area confirmed by a thickness measurements on trial coupons Alternatively, a slight excess of grease may be applied by immersing the plate in a bath of molten grease and, after allowing the grease to cool, removing the excess by sliding a heated straight edge over previously applied tape strips in a similar manner to that described in B.1.2 The aim shall be to produce a smooth, uniform surface without imperfections or air entrapment 25 25 100 ± Evaluation area 100 ± 15 15 IEC 2130/11 Dimensions in millimetres Note Tolorance ± mm unless otherwise indicated Figure B.2 – Coupon for type B grease Excess grease shall be removed from the edges of the coupon and the face not under test, and the average thickness calculated to the closest 10 µm by measuring the increase in mass of the coupon, using 0,87 g/cm for the density of the protective product, or the value supplied by the grease supplier BS EN 61394:2011 61394 © IEC:2011(E) B.4 – 15 – Ageing Three cups shall be filled with grease and, together with the three coupons held vertically, shall be placed in a test chamber and subjected to three cycles, each consisting of the following sequences: − 72 h dry heat (relative humidity less than 30 %) at 70 °C; − 24 h wet heat (relative humidity greater than 90 %) at 55 °C; − three 24 h periods of wet heat and cold comprising: B.5 − 0h to 9h humid atmosphere at 55 °C; − 9h to 11 h holding in a cold chamber at –20 °C; − 11 h to 14 h humid atmosphere at 55 °C; − 14 h to 16 h holding in a cold chamber at –20 °C; − 16 h to 24 h humid atmosphere at 55 °C Tolerance Tolerance on time shall be 0,1 h Tolerance on temperature shall be ± °C BS EN 61394:2011 – 16 – 61394 © IEC:2011(E) Annex C (normative) Stability of grease on conductor at high temperature This test is performed at the request of the purchaser only The maximum operating temperature, θ , shall be defined by the purchaser The sample conductor shall be at least m long and be terminated with compression type tension clamps The filler compound used in the compression type tension clamps shall be compatible with the grease being tested The sample shall be maintained at a tension of between 15 % to 20 % of its rated tensile strength, at a slope of between 10 ° and 15 ° to the horizontal and heated by the passage of current through its whole length The sample shall be subjected to the following procedure: − the temperature of the sample shall be raised to the maximum operating temperature θ by increments of 20 °C per 15 min; − the sample shall be maintained at the maximum operating temperature θ for h; the temperature shall be raised by increments of °C per 10 until the grease flows freely from the conductor, or until the maximum operating temperature θ is reached, whichever comes first − The following temperatures shall be recorded: − the temperature at which the product fills any space between the wires of the outside layer, θA; − the temperature at which the product drips from the conductor (for information only) BS EN 61394:2011 61394 © IEC:2011(E) – 17 – Annex D (normative) Stability of grease complete conductor under short-circuit a) This test is performed at the request of the purchaser only b) The withstand temperature, θ , shall be defined by the purchaser c) The sample conductor shall be at least m long and be terminated with compression type tension clamps The filler compound used in the compression type tension clamps shall be compatible with the grease being tested d) The sample shall be maintained at a tension of between 15 % to 20 % of its rated tensile strength, at a slope of between 10 ° and 15 ° to the horizontal and heated by the passage of current through its whole length e) The required short-circuit current shall be applied through the end fittings for between 0,5 s to 1,5 s f) The maximum conductor surface temperature shall be recorded BS EN 61394:2011 – 18 – 61394 © IEC:2011(E) Bibliography This annex contains lists of related systems standards IEC 60050-466, International Electrotechnical Vocabulary – Chapter 466: Overhead lines ISO 3310-1, Test sieves – Technical requirements and testing – Part 1: Test sieves of metal wire cloth ISO 3310-2, Test sieves – Technical requirements and testing – Part 2: Test sieves of perforated metal plate ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results – Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method IP 121/05 , Determination of oil separation from lubrication grease – Pressure filtration method _ _ IP = Institute of Petroleum This page deliberately left blank British Standards Institution (BSI) BSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and services It presents the UK view on standards in Europe and at the international level BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited Revisions Information on standards British Standards and PASs are periodically updated by amendment or revision Users of British Standards and PASs should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or 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