1、BRITISH STANDARD BS EN 61234-2:1998 IEC 61234-2: 1997 Electrical insulating materials Methods of test for hydrolytic stability Part 2: Moulded thermosets The European Standard EN 61234-2:1997 has the status of a British Standard ICS 29.035.01BSEN 61234-2:1998 This British Standard, having been prepa
2、red under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 April 1998 BSI 04-1999 ISBN 0 580 29018 2 National foreword This British Standard is the English language version of EN61234-2:1997. It is identical with IE
3、C61234-2:1997. The UK participation in its preparation was entrusted by Technical Committee GEL/15, Insulating materials, to Subcommittee GEL/15/5, Methods of test, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any
4、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. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 19
5、97, all IEC publications have the number 60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is d
6、rawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standard
7、s 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
8、their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theENtitle page, pages 2 to 6 and a back cover. This standard has been updated (see
9、copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN 61234-2:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61234-
10、2 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61234-2 February1998 ICS29.035.01 Descriptors: Electrical insulating materials, solid electrical insulating materials, thermosetting materials, moulding materials, tests, stability tests, determination, hydrolytic resistance, measurement
11、s, tensile strength, permittivity, test specimen English version Electrical insulating materials Methods of test for the hydrolytic stability Part 2: Moulded thermosets (IEC 61234-2:1997) Matriaux isolants lectriques Mthodes dessai concernant la stabilit hydrolytique Partie 2: Matriaux thermodurciss
12、ables mouls (CEI 61234-2:1997) Elektroisolierstoffe Prfverfahren fr die Hydrolysebestndigkeit Teil 2: Gehrtete Formstoffe (IEC 61234-2:1997) This European Standard was approved by CENELEC on 1997-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
13、 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
14、 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 electro
15、technical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Nor
16、malisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61234-2:1998 EEN61234-2:1998 BSI 04-1999 2 Fo
17、reword The text of document 15E/57 + 57A/FDIS, future edition 1 of IEC61234-2, prepared by SC15E, Methods of test, of IECTC15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61234-2 on1997-10-01. The following dates were fixed: Annexes designate
18、d “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61234-2:1997 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword
19、2 1 Scope 3 2 Normative references 3 3 Properties to be measured 3 4 Test specimens 3 5 Conditioning 3 6 Apparatus 3 7 Procedure 4 8 Results 4 9 Report 5 Annex ZA (normative) Normative referencestointernational publications with theircorresponding European publications 6 latest date by which the EN
20、has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-07-01EN61234-2:1998 BSI 04-1999 3 1 Scope This part of IEC 61234 describes t
21、he test method for the determination of the hydrolytic stability of moulded thermosets made of room temperature or oven-curing reaction resins when subjected to the simultaneous influence of water and high temperature. With this test method, the irreversible change of mechanical and electrical prope
22、rties is measured, but no mechanical stress is imposed on the test specimens. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC61234. At the time of publication, the editions indicated were val
23、id. All normative documents are subject to revision, and parties to agreement based on this part of IEC61234 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid Int
24、ernational Standards. IEC 60212:1971, Standard conditions for use prior to and during the testing of solid electrical insulating materials. IEC 60250:1969, Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, aud
25、io and radio frequencies including metre wavelength. IEC 60455-2:1977, Specification for solventless polymerisable resinous compounds used for electrical insulation Part 2: Methods of test. IEC 60584-1:1995, Thermocouples Part 1: Reference tables. IEC 60584-2:1982, Thermocouples Part 2: Tolerances.
26、Amendment 1 (1989) ISO 527-2:1993, Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusion plastics. 3 Properties to be measured Changes in the electrical and mechanical properties are determined in accordance with the International Standards specified below.
27、3.1 dielectric dissipation factor and permittivity See clause 37 of IEC60455-2 which refers to IEC60250. 3.2 tensile strength Tensile strength of the specimen is measured in accordance with ISO527-2. 4 Test specimens 4.1 Dissipation factor and permittivity The dimensions of the test specimens for th
28、e evaluation of dissipation factor retention versus temperature shall be (100 1) mm (100 1) mm (1 0,1) mm. The same test specimens shall be measured prior and after the immersion test (clause7) for each temperature/time combination used. If the preparation of test specimens of1mm thickness is not po
29、ssible (due to high viscosity or high filling rate of the reaction resin), test specimens of3mm 0,1mm shall be used. 4.2 Tensile strength At least three individual test specimens shall be tested for each property evaluated at each test temperature and time. For the determination of the properties of
30、 the untreated moulded thermosets10test specimens shall be used. Unless otherwise specified, the dimensions for the test specimens shall be in accordance with type1B of ISO527-2. 5 Conditioning Test specimens prepared from room-temperature curing reaction resins shall be stored24h at room temperatur
31、e in accordance with IEC60212 and finally cured for24h at80C. The test specimens prepared from oven-curing reaction resins shall be conditioned according to the manufacturers recommendation in order to obtain well cured specimens. The test specimens shall be tested immediately after oven curing and
32、conditioning at room temperature or stored in a desiccator prior to testing. After the bath immersion, the test specimens shall be dried at60C2K for48h at an absolute pressure of less than100Pa and then stored at room temperature for a minimum of8h in a desiccator prior to further testing. 6 Apparat
33、us 6.1 Ageing vessel The ageing vessel shall have a minimum volume of5l.EN61234-2:1998 4 BSI 04-1999 For pressure vessels, not more than5% water loss is permissible after1000h at the test temperature. The material of the ageing vessel shall be chosen so that the ageing vessel is able to satisfy the
34、following calibration inertness test. Demineralized water according to7.2 is heated at the highest test temperature140C 2K for1000h. The pH of the water as measured after the inertness test shall not change from7,0 0,5 to more than7,0 1,5 and the conductivity shall not extend beyond the range of5004
35、S/m to1000 4S/m. Specimens prepared from room-temperature curing reaction resins can be aged in a glass container covered with aluminium foil. NOTENational codes and regulations for the use of pressure vessels should be observed. 6.2 Temperature measuring device The temperature inside the ageing ves
36、sel or glass container shall be measured with a thermocouple in accordance with IEC60584-1 and IEC60584-2. 6.3 pH-meter The pH-meter shall have an accuracy of at least 0,05 pH 7 Procedure 7.1 Outline The principle of this test is that the test specimens made of moulded thermosets are immersed in wat
37、er for different times and at different temperatures. The test specimens are then dried again according to clause5 and tested to determine the electrical and mechanical properties. The percent retention of those electrical and mechanical properties, in comparison to the untreated test specimens, is
38、reported. 7.2 Treatment medium Demineralized water is used which, before treatment commences, shall have a conductivity of less than5004S/m and a pH of7,0 0,5. 7.3 Immersion treatment procedure The test specimens shall be prepared and conditioned in accordance with clauses4 and5 and subjected to wat
39、er immersion in the ageing vessel. The test specimens shall not be subjected to any physical stress nor is any direct contact between adjacent specimens permitted. Only one type of moulded thermosets shall be tested in the vessel at one time; the water in the vessel shall be changed when the type of
40、 resin tested in subsequent trials is changed. 7.4 Temperature of treatment The temperatures, which shall be applied for test specimens prepared from room temperature curing reaction resins as well as from oven-curing reaction resins are: for moulded thermosets with a temperature index 155 : 90C 2K,
41、 120C 2K and140C2K. Except for mouldet thermosets with a temperature index 100the testing shall include at least two of these temperatures. The temperature inside the pressure vessel shall be measured with a thermocouple in accordance with6.2. 7.5 Duration of the treatment The recommended times for
42、the treatment at each temperature are48h and168h. Optional treatment periods of500h and1000h may also be used. The interruption of the treatment caused by removal of samples from the vessel for testing should be as short as possible. Any volume of water lost in this process shall be replaced. 8 Resu
43、lts The results of the mechanical and electrical property tests conducted shall be given as residual mean values, expressed in percent of the mean initial value of the property. The calculation is as follows: where Ris the percentage of the property retained; (t,T) is the mean value at time t and te
44、mperature T; cis the initial mean value; can be tan $ (dissipation factor) or b) the temperature applied in treatment of the test specimens; c) the treatment time of the specimens; d) percent retention of tensile strength for each time-temperature combination tested; e) percent retention of the diss
45、ipation factor and permittivity for each time-temperature combination tested.EN61234-2:1998 6 BSI 04-1999 Annex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisio
46、ns from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by a
47、mendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTEWhen an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60212
48、1971 Standard conditions for use prior to and during thetesting of solid electrical insulating materials HD 437 S1 1984 IEC 60250 1969 Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio andradio frequenci
49、es including metre wavelengths IEC 60455-2 1977 Specification for solventless polymerisable resinouscompounds used for electrical insulation Part 2: Methods of test HD 307.2 S1 a 1986 IEC 60584-1 1995 Thermocouples Part 1: Reference tables EN 60584-1 1995 IEC 60584-2 +A1 1982 1989 Part 2: Tolerances EN 60584-2 1993 ISO 527-2 1993 Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusionplastics EN ISO 527-2 1996 a HD 307.2 S1 includes A1:1982 to IEC 60455-2.
