1、BRITISH STANDARD BS EN 50326:2002 Conductors for overhead lines Characteristics of greases The European Standard EN 50326:2002 has the status of a British Standard ICS 29.240.20; 75.100 BS EN 50326:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Po
2、licy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 6 December 2002 BSI 6 December 2002 ISBN 0 580 40940 6 National foreword This British Standard is the official English language version of EN 50326:2002. The UK participation in its prepa
3、ration was entrusted to Technical Committee GEL/7, Overhead electrical conductors, 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 publ
4、ications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the ne
5、cessary provisions of a contract. Users are responsible for its 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 international/European committee any enquiries on the in
6、terpretation, 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 20, an inside back cover and
7、a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50326 NORME EUROPENNE EUROPISCHE NORM August 2002 CENELEC European Committee for Electrotechnical Standardizatio
8、n Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50326:2002 E ICS 29
9、.240.20; 75.100 English version Conductors for overhead lines - Characteristics of greases Conducteurs pour lignes ariennes - Caractristiques des produits de protection Leiter fr Freileitungen - Eigenschaften von Fetten This European Standard was approved by CENELEC on 2002-03-01. CENELEC members ar
10、e 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
11、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
12、 same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland
13、 and United Kingdom.EN 50326:2002 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 7, Overhead electrical conductors. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50326 on 2002-03-01. The following dates were fixed:
14、- latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2003-03-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-03-01 Annexes designated “normative“ are par
15、t of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes A, B, C and D are normative and annex E is informative. _- 3 - EN 50326:2002 Contents 1 Scope.4 2 Normative references4 3 Definitions 4 4 Designation system.4 5 Requirements for
16、grease.5 6 Tests5 7 Packaging and marking.10 8 Information to be clarified by the grease purchaser and the grease supplier 11 Annex A (normative) Acidity or alkalinity test method for type B grease.13 Annex B (normative) Sample preparation and test procedure for ageing test.15 Annex C (normative) Te
17、st method for stability under steady state conditions.18 Annex D (normative) Test method for stability under short circuit conditions .19 Annex E (informative) Greases in frequent use in some of the member countries20 Figure 1 Grading index of degree of corrosion (see 6.12.2).12 Figure B.1 Suggested
18、 method for coating steel plates with type A grease15 Figure B.2 Steel plate for type B grease16 Table 1 Type and sample tests for grease 6 Table 2 Type A grease penetrability test acceptance criteria .7 Table 3 Type B grease penetrability test acceptance criteria .8 Table A.1 Acidity or alkalinity
19、index formula 14 Table E.1 Greases in common use in some member countries .20EN 50326:2002 - 4 - 1 Scope This standard specifies the characteristics of protective products, commonly known as greases, for corrosion protection of bare overhead line conductors made of aluminium, aluminium alloy, steel
20、wires or a combination of these wires. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated referen
21、ces, subsequent amendments to or revisions of any of these publications apply to this European standard only when incorporated in it by amendment or revision. For undated references the latest issue of the publication referred to applies. EN 10152 Electrolytically zinc coated cold rolled steel flat
22、products Technical delivery conditions EN 50182 Conductors for overhead lines Round wire concentric lay stranded conductors EN 60068-2-11 Basic environmental procedures Part 2 Test Ka Salt mist. (endorsing IEC 60068-2-11:1981) IEC 60050-466 International Electrotechnical Vocabulary (IEV) Chapter 466
23、: Overhead Lines ISO 2176 1972 Petroleum Lubricating grease Determination of dropping point IP 121 Determination of oil separation from lubricating grease Pressure filtration method ISO 2137 1985 Petroleum products Lubricating greases and petrolatums Determination of cone penetration 3 Definitions F
24、or the purpose of this standard, the definitions given in IEC 60050-466 and in EN 50182 apply. 4 Designation system 4.1 Greases shall be designated 1 A 2or 1 B 2where, A and B define the type of grease as follows: - type A - grease applied without heating, for example greases consisting essentially
25、of a stabilised mixture of mineral or synthetic oil and thickeners such as metal soaps or inorganic compounds; - type B - grease applied with heating, for example greases consisting of petrolatum, waxes associated with small quantities of mineral oil and organic additives; - 1is the lowest temperatu
26、re in C below 0 C at which tests referred to in this standard are required to be carried out; - 2is the highest temperature in C at which tests referred to in this standard are required to be carried out. If required by the user of the conductor the values of 1and 2shall be specified by the grease p
27、urchaser.- 5 - EN 50326:2002 Examples: 20A150 type A grease with a temperature 1of - 20 C and a temperature 2of 150 C. 20B110 type B grease with a temperature 1of - 20 C and a temperature 2of 110 C. 4.2 The grease supplier shall provide a unique name or code for the grease, and shall retain details
28、of the grease composition for verification purposes. The composition shall include manufacturing tolerances and shall remain unchanged while the grease is marketed under the specific name or code, unless agreement has been reached with the conductor user. 5 Requirements for grease 5.1 The grease sha
29、ll meet the following requirements. 5.2 The grease shall protect overhead line conductors from atmospheric corrosion in service and in storage. The test requirements in 6.12 shall be met. 5.3 The grease shall remain in the conductor for the specified conditions of operation and meet the specified re
30、quirements for the service life of the conductor. The requirements of the tests in 6.5, 6.6, 6.7, 6.8, 6.10 and 6.11 shall be met to demonstrate this, and in addition the tests given in 6.13 may be specified by the grease purchaser. 5.4 To demonstrate that the grease may be satisfactorily applied to
31、 a conductor with good adhesion, the test requirements in 6.7 and 6.9 shall be met. 6 Tests 6.1 General No test shall be performed at a temperature greater than the maximum safe operating temperature indicated by the grease supplier. All mandatory tests in this standard shall be performed by the gre
32、ase supplier; grease tests specified in EN 50182 shall be performed by the conductor manufacturer. 6.2 Classification of tests 6.2.1 Type tests are intended to verify the main characteristics of a grease which depend on its composition. These tests are normally performed only once for a grease suppl
33、iers specific name or code, but shall be repeated if the composition of the grease has changed such that any of the test characteristics given in Table 1 may have changed. 6.2.2 Sample tests are intended to guarantee the quality of the grease and compliance with the requirements of this standard.EN
34、50326:2002 - 6 - 6.2.3 Type tests and sample tests are listed in Table 1. Table 1 - Type and sample tests for grease Test Type test Sample test Requirements subclause Characteristic Subclause Type A Type B Type A Type B 5.3 Drop point 6.5 - X - X 5.3 High temperature stability 6.6 X - X - 5.3, 5.4 P
35、enetrability (type A) 6.7 X - X - 5.3 Penetrability (type B) 6.8 - X - X 5.4 Adhesion 6.9 X X - - 5.3 Acidity/alkalinity index 6.10 - X - - 5.3 Ageing 6.11 X X - - 5.2 Corrosion 6.12 X X - - 5.3 Stability under steady state conditions 6.13.1 aa - 5.3 Stability under short circuit conditions 6.13.2 a
36、a - a By agreement between the grease purchaser and the grease supplier, when the test is required by the user of the conductor. 6.3 Preconditioning of samples 6.3.1 Type B grease delivered in solid form shall be preconditioned in order to homogenize the grease prior to the tests of 6.5, 6.8, 6.9 an
37、d 6.10, unless otherwise specified in these subclauses, as follows. 6.3.1.1 The grease shall be heated to between 10 C and 20 C above the temperature at which melting occurs, and maintained at this temperature for 0,5 h. 6.3.1.2 The quantity required for the tests shall be poured, in the liquid stat
38、e, into the test containers and left to cool for a minimum of 24 h. 6.3.2 Excess oil on the surface of type A grease, as delivered, shall be cause for rejection. 6.4 Temperature accuracy In all tests referred to in this standard, temperatures shall be measured using equipment with an accuracy of at
39、least 1 C. 6.5 Drop point test for type B grease Five determinations of the drop point shall be made using the method given in ISO 2176. The minimum value of the five determinations mshall be greater than or equal to 2 .- 7 - EN 50326:2002 6.6 High temperature stability tests for type A grease 6.6.1
40、 This requirement shall be demonstrated by the following two tests. 6.6.2 Oil separation shall be determined, using the method given in IP 121, after 1 h at a temperature of 2 . The maximum quantity of oil separated shall be a mass fraction of 0,2 %. 6.6.3 The drop point test shall be performed on f
41、ive samples using the method given in ISO 2176. Type A grease may not have a well defined drop point. Tests may be discontinued at ( 2+ 20) C unless the grease purchaser requires evidence of short circuit temperature capability, in which case the drop point test shall be continued to the required te
42、mperature. 6.7 Penetrability test for type A grease 6.7.1 The penetrability test shall be performed on type A grease to a) verify that deliveries of grease are compatible with the type test sample, b) establish that the grease is capable of being satisfactorily pumped, c) verify that the grease prop
43、erties have not significantly changed after ageing (see 6.11) to represent storage and in-service conditions. 6.7.2 A sample of grease shall be tested, using the method given in ISO 2137, using a full scale cone, at a temperature of 25 C. 6.7.3 Acceptance criteria shall be as given in Table 2. Table
44、 2 - Type A grease penetrability test acceptance criteria Test Acceptance criterion Type test Mean value 70 1 / 10 mm unless otherwise agreed between grease purchaser and grease supplier Sample test The mean value shall not differ from the type test mean value by more than 20 % of the type test mean
45、 value 6.8 Penetrability test for type B grease 6.8.1 The penetrability test in 6.8.2 shall be performed on type B grease to a) verify that deliveries of grease are compatible with the type test sample, b) verify, together with the acidity/alkalinity test (see 6.10), that the grease properties have
46、not significantly changed after ageing (see 6.11) to represent storage and in-service conditions. 6.8.2 A sample of grease shall be tested, using the method given in ISO 2137, using a full scale cone, at a temperature of 25 C.EN 50326:2002 - 8 - 6.8.3 Acceptance criteria shall be as given in Table 3
47、. Table 3 - Type B grease penetrability test acceptance criteria Test Acceptance criterion Type test 120 180 1 / 10 mm Sample test The mean value shall not differ from the type test mean value by more than 20 % of the type test mean value 6.9 Low temperature adhesion 6.9.1 An aluminium plate measuri
48、ng approximately (100 5) mm x (100 5) mm with a thickness of (1,0 0,1) mm, covered with a layer of grease (0,5 0,05) mm thick on one side, shall be cooled, together with a 25 mm diameter mandrel, to a temperature not greater than 1 and held for 1 h. 6.9.2 The plate shall be placed on the mandrel wit
49、h the greased face uppermost and, within 5 s, bent steadily to form an internal angle on the ungreased face of between 100 and 120. 6.9.3 The acceptance criterion shall be that the grease shall remain adhering to the plate without any cracks or separations being visible to the naked eye with normal or corrected vision, but without magnification. 6.10 Acidity or alkalinity index test for
