SIST EN 50326:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Vodniki za nadzemne vode – Karakteristike masti za vodnikeLeiter für Freileitungen - Eigenschaften von FettenConducteurs pour lignes aériennes - Caractéristiques des produits de protectionConductors for overhead lines - Characteristics of greases75.100MazivaLubricants, industrial oils and related products29.240.20DaljnovodiPower transmission and distribution lines29.060.20KabliCablesICS:Ta slovenski standard je istoveten z:EN 50326:2002SIST EN 50326:2003en01-junij-2003SIST EN 50326:2003SLOVENSKI
STANDARD



SIST EN 50326:2003



EUROPEAN STANDARDEN 50326NORME EUROPÉENNEEUROPÄISCHE NORMAugust 2002CENELECEuropean Committee for Electrotechnical StandardizationComité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische NormungCentral 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 EICS 29.240.20; 75.100English versionConductors for overhead lines -Characteristics of greasesConducteurs pour lignes aériennes -Caractéristiques des produits deprotectionLeiter für Freileitungen -Eigenschaften von FettenThis European Standard was approved by CENELEC on 2002-03-01. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language andnotified 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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.SIST EN 50326:2003



EN 50326:2002- 2 -ForewordThis European Standard was prepared by the Technical Committee CENELEC TC 7, Overheadelectrical conductors.The text of the draft was submitted to the formal vote and was approved by CENELEC as EN50326 on 2002-03-01.The following dates were fixed:-latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement(dop)2003-03-01-latest date by which the national standards conflictingwith the EN have to be withdrawn(dow)2005-03-01Annexes designated "normative" are part 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.__________SIST EN 50326:2003



- 3 -EN 50326:2002Contents1Scope.42Normative references.43Definitions.44Designation system.45Requirements for grease.56Tests.57Packaging and marking.108Information to be clarified by the grease purchaser and the grease supplier.11Annex A (normative)
Acidity or alkalinity test method for type B grease.13Annex B (normative)
Sample preparation and test procedure for ageing test.15Annex C (normative)
Test method for stability under steady state conditions.18Annex D (normative)
Test method for stability under short circuit conditions.19Annex E (informative)
Greases in frequent use in some of the member countries.20Figure 1 – Grading index of degree of corrosion (see 6.12.2).12Figure B.1 – Suggested method for coating steel plates with type A grease.15Figure B.2 – Steel plate for type B grease.16Table 1 – Type and sample tests for grease.6Table 2 – Type A grease penetrability test acceptance criteria.7Table 3 – Type B grease penetrability test acceptance criteria.8Table A.1 – Acidity or alkalinity index formula.14Table E.1 – Greases in common use in some member countries.20SIST EN 50326:2003



EN 50326:2002- 4 -1ScopeThis standard specifies the characteristics of protective products, commonly known asgreases, for corrosion protection of bare overhead line conductors made of aluminium,aluminium alloy, steel wires or a combination of these wires.2Normative referencesThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisionsof any of these publications apply to this European standard only when incorporated in it byamendment or revision. For undated references the latest issue of the publication referred toapplies.EN 10152Electrolytically zinc coated cold rolled steel flat products –Technical delivery conditionsEN 50182Conductors for overhead lines – Round wire concentric laystranded conductorsEN 60068-2-11Basic environmental procedures – Part 2 – Test Ka – Salt mist.(endorsing IEC 60068-2-11:1981)IEC 60050-466International Electrotechnical Vocabulary (IEV) – Chapter 466:Overhead LinesISO 21761972Petroleum – Lubricating grease – Determination of dropping pointIP 121Determination of oil separation from lubricating grease – Pressurefiltration methodISO 21371985Petroleum products – Lubricating greases and petrolatums –Determination of cone penetration3DefinitionsFor the purpose of this standard, the definitions given in IEC 60050-466 and in EN 50182apply.4Designation system4.1Greases shall be designated 1A2 or 1B2 where, A and B define the type of grease asfollows:-type A - grease applied without heating, for example greases consisting essentially of astabilised mixture of mineral or synthetic oil and thickeners such as metal soaps orinorganic compounds;-type B - grease applied with heating, for example greases consisting of petrolatum,waxes associated with small quantities of mineral oil and organic additives;-1 is the lowest temperature in °C below 0 °C at which tests referred to in this standardare required to be carried out;-2 is the highest temperature in °C at which tests referred to in this standard are requiredto be carried out.If required by the user of the conductor the values of 1 and 2 shall be specified by the greasepurchaser.SIST EN 50326:2003



- 5 -EN 50326:2002Examples:20A150type A grease with a temperature 1 of - 20 °C and a temperature 2 of 150 °C.20B110type B grease with a temperature 1 of - 20 °C and a temperature 2 of 110 °C.4.2The grease supplier shall provide a unique name or code for the grease, and shall retaindetails of the grease composition for verification purposes. The composition shall includemanufacturing tolerances and shall remain unchanged while the grease is marketed under thespecific name or code, unless agreement has been reached with the conductor user.5Requirements for grease5.1The grease shall meet the following requirements.5.2The grease shall protect overhead line conductors from atmospheric corrosion in serviceand in storage. The test requirements in 6.12 shall be met.5.3The grease shall remain in the conductor for the specified conditions of operation andmeet the specified requirements for the service life of the conductor. The requirements of thetests in 6.5, 6.6, 6.7, 6.8, 6.10 and 6.11 shall be met to demonstrate this, and in addition thetests given in 6.13 may be specified by the grease purchaser.5.4To demonstrate that the grease may be satisfactorily applied to a conductor with goodadhesion, the test requirements in 6.7 and 6.9 shall be met.6Tests6.1GeneralNo test shall be performed at a temperature greater than the maximum safe operatingtemperature indicated by the grease supplier.All mandatory tests in this standard shall be performed by the grease supplier; grease testsspecified in EN 50182 shall be performed by the conductor manufacturer.6.2Classification of tests6.2.1Type tests are intended to verify the main characteristics of a grease which depend onits composition. These tests are normally performed only once for a grease supplier's specificname or code, but shall be repeated if the composition of the grease has changed such thatany of the test characteristics given in Table 1 may have changed.6.2.2Sample tests are intended to guarantee the quality of the grease and compliance withthe requirements of this standard.SIST EN 50326:2003



EN 50326:2002- 6 -6.2.3Type tests and sample tests are listed in Table 1.Table 1 - Type and sample tests for greaseTestType testSample testRequirementssubclauseCharacteristicSubclauseType AType BType AType B5.3Drop point6.5-X-X5.3High temperaturestability6.6X-X-5.3, 5.4Penetrability (type A)6.7X-X-5.3Penetrability (type B)6.8-X-X5.4Adhesion6.9XX--5.3Acidity/alkalinity index6.10-X--5.3Ageing6.11XX--5.2Corrosion6.12XX--5.3Stability under steadystate conditions6.13.1aa--5.3Stability under shortcircuit conditions6.13.2aa--aBy agreement between the grease purchaser and the grease supplier, when the test is requiredby the user of the conductor.6.3Preconditioning of samples6.3.1Type B grease delivered in solid form shall be preconditioned in order to homogenizethe grease prior to the tests of 6.5, 6.8, 6.9 and 6.10, unless otherwise specified in thesesubclauses, as follows.6.3.1.1The grease shall be heated to between 10 °C and 20 °C above the temperature atwhich melting occurs, and maintained at this temperature for 0,5 h.6.3.1.2The quantity required for the tests shall be poured, in the liquid state, into the testcontainers and left to cool for a minimum of 24 h.6.3.2Excess oil on the surface of type A grease, as delivered, shall be cause for rejection.6.4Temperature accuracyIn all tests referred to in this standard, temperatures shall be measured using equipment withan accuracy of at least 1 °C.6.5Drop point test for type B greaseFive determinations of the drop point shall be made using the method given in ISO 2176.The minimum value of the five determinations m shall be greater than or equal to 2.SIST EN 50326:2003



- 7 -EN 50326:20026.6High temperature stability tests for type A grease6.6.1This requirement shall be demonstrated by the following two tests.6.6.2Oil separation shall be determined, using the method given in IP 121, after 1 h at atemperature of 2. The maximum quantity of oil separated shall be a mass fraction of 0,2 %.6.6.3The drop point test shall be performed on five samples using the method given inISO 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 temperaturecapability, in which case the drop point test shall be continued to the required temperature.6.7Penetrability test for type A grease6.7.1The penetrability test shall be performed on type A grease toa)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 properties have not significantly changed after ageing (see 6.11) torepresent storage and in-service conditions.6.7.2A sample of grease shall be tested, using the method given in ISO 2137, using a fullscale cone, at a temperature of 25 °C.6.7.3Acceptance criteria shall be as given in Table 2.Table 2 - Type A grease penetrability test acceptance criteriaTestAcceptance criterionType testMean value ≥ 70 1/10 mm unless otherwise agreed betweengrease purchaser and grease supplierSample testThe mean value shall not differ from the type test mean valueby more than 20 % of the type test mean value6.8Penetrability test for type B grease6.8.1The penetrability test in 6.8.2 shall be performed on type B grease toa)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 havenot significantly changed after ageing (see 6.11) to represent storage and in-serviceconditions.6.8.2A sample of grease shall be tested, using the method given in ISO 2137, using a fullscale cone, at a temperature of 25 °C.SIST EN 50326:2003



EN 50326:2002- 8 -6.8.3Acceptance criteria shall be as given in Table 3.Table 3 - Type B grease penetrability test acceptance criteriaTestAcceptance criterionType test120 – 180 1/10 mmSample testThe mean value shall not differ from the type test mean valueby more than 20 % of the type test mean value6.9Low temperature adhesion6.9.1An aluminium plate measuring approximately (100 ± 5) mm x (100 ± 5) mm with athickness 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 1and held for 1 h.6.9.2The plate shall be placed on the mandrel with the greased face uppermost and, within5 s, bent steadily to form an internal angle on the ungreased face of between 100° and 120°.6.9.3The acceptance criterion shall be that the grease shall remain adhering to the platewithout any cracks or separations being visible to the naked eye with normal or correctedvision, but without magnification.6.10Acidity or alkalinity index test for type B grease6.10.1The acidity or alkalinity test shall be performed to verify, together with the penetrabilitytest (see 6.8), that the grease properties have not significantly changed after ageing(see 6.11).6.10.2The test method shall be as described in Annex A.6.10.3The acidity or alkalinity index before ageing shall be less than or equal to 2,0 unlessotherwise agreed between the grease purchase and grease supplier.6.11Ageing test6.11.1 Preconditioning of type B grease - In order to simulate the storage of type B grease athigh temperatures, a suitable quantity of grease shall be heated to a temperature of 2
...