1、BRITISH STANDARD BS EN 61302:1996 IEC1302:1995 Electrical insulating materials Methodtoevaluate the resistance to tracking and erosion Rotatingwheel dip test The European Standard EN61302:1995 has the status of a BritishStandardBSEN61302:1996 This BritishStandard, having been prepared under the dire
2、ctionof the Electrotechnical Sector Board, was published underthe authorityof the Standards Board and comesintoeffect on 15March1996 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference GEL/15 Draft for comment91/26630 DC ISBN 0 580 24899 2 Committees res
3、ponsible for this BritishStandard The preparation of this BritishStandard was entrusted to Technical Committee GEL/15, Insulating materials, upon which the following bodies were represented: British Ceramic Research Ltd. British Industrial Ceramic Manufacturers Association British Telecommunications
4、 plc Department of Trade and Industry (National Physical Laboratory) Electrical and Electronic Insulation Association (BEAMA Ltd.) Electricity Association Federation of the Electronics Industry Ministry of Defence Rotating Electrical Machines Association (BEAMA Ltd.) Transmission and Distribution As
5、sociation (BEAMA Ltd.) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: AEA Technology British Cable Manufactures Association British Industrial Ceramic Manufacturers Association British Plastics Federation Amendments issued since publicat
6、ion Amd. No. Date CommentsBSEN61302:1996 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN61302 3BSEN61302:1996 ii BSI 03-2000 National foreword This BritishStandard has been prepared by Technical Committee GEL/15 and is the English lang
7、uage version of EN61302:1995 Electrical insulating materials Method to evaluate the resistance to tracking and erosion Rotating wheel dip test published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1302:1995 (including corrigendum September1995) p
8、ublished by the International Electrotechnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity
9、from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indica
10、ted in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61302 July1995 ICS 29.040.20 Descriptors: Electrical insulating materials, solid electrical insulating materials, tests, tracking resistance, corrosion resistance, erosion corrosion, immersion te
11、sts, contaminants, testing conditions English version Electrical insulating materials Methodtoevaluatetheresistance to tracking and erosion Rotating wheel dip test (IEC1302:1995+corrigendum1995) Matriaux isolants lectriques Mthodedvaluation de la rsistance au cheminement et lerosion Essaiauvolantrot
12、atif immersion (CEI1302:1995+corrigendum1995) Elektroisolierstoffe PrfverfahrenzurBeurteilung des Widerstandes gegen Kriechwegbildung und Aushhlung Zyklische Prfung (IEC1302:1995+corrigendum1995) This European Standard was approved by CENELEC on1995-07-04. CENELEC members are bound to comply with th
13、e 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 o
14、r 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 offic
15、ial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical
16、 Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. EN61302:1995 EEN61302:1995 BSI 03-2000 2 Foreword The text of document15B(CO)
17、92, future edition1 of IEC1302, prepared by SC15B, Endurance tests, of IEC TC15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61302 on1995-07-04. The following dates were fixed: Annexes designated “normative” are part of the body of the standa
18、rd. Annexes designated “informative” are given for information only. In this standard, Annex ZA is normative and Annex A and Annex B are informative. Annex ZA has been added by CENELEC. Contents Page Foreword 2 1 Scope and object 3 2 Normative reference 3 3 Definitions 3 4 Test specimen 4 5 Test app
19、aratus 4 6 Test procedure 5 7 Test results 5 8 Test report 5 Annex A (informative) Examples of test specimens (Figure A.1) and a test apparatus (Figure A.2 to Figure A.6) that meet the requirements of this standard 6 Annex B (informative) Bibliography Inside back cover Annex ZA (normative) Normative
20、 references to international publications with their corresponding European publications Inside back cover Figure A.1 Electrodes and test specimen 7 Figure A.2 8 Figure A.3 9 Figure A.4 10 Figure A.5 11 Figure A.6 Simplified circuit diagram of atestcircuit 12 latest date by which the ENhas to be imp
21、lemented at national level by publication of an identical national standard or by endorsement (dop) 1996-04-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow) 1996-04-01EN61302:1995 BSI 03-2000 3 1 Scope and object This International Standard describes a
22、 method of test for comparing the performance of insulating materials, when they are exposed intermittently to a liquid contaminant and then to an a.c. electric stress along their surface. It should be realized that the test was developed to compare the resistance to tracking and erosion of material
23、s belonging to one specific family, so that comparisons between results in different families may not be fully valid. The test apparatus uses a rotating wheel on which standard 1)rod- or tube-shaped specimens, fitted with electrodes at each end, are located around the periphery of the wheel. The whe
24、el, mounted at a small angle to the horizontal, is rotated slowly so that the test specimens are repeatedly dipped in a specified salt-water solution (contaminant) and then withdrawn. After withdrawal, the solution is allowed to drain or drip from the surface of the test specimen for a short time be
25、fore a specified voltage is applied. The voltage causes electrical discharges (tiny arcs, scintillations) across dry areas which develop on the surface of the specimens. These discharges may cause surface degradation to progress; until flashover occurs, or the leakage current exceeds a specified val
26、ue 2) . The time to flashover, or to exceed the specified leakage current, and observation of the nature and severity of degradation are the criteria used to compare materials. The test conditions described in this International Standard lead to longer failure times than obtained from other tracking
27、 and erosion tests. IEC112 and IEC587 (seeAnnex B) describe tests of much shorter duration, on smaller samples, to assess the ability of materials to withstand electric stress when exposed to liquid contamination on one surface. These tests may rate materials differently from tests of longer duratio
28、n. Salt-fog tersts (not yet standardized by IEC) are also in use. Such tests permit comparison of materials in the form in which they will be used in service. The test results are then dependent both on the materials used and the design of the test specimens. Such tests may also evaluate materials d
29、ifferently. As the test conditions cause surface discharges on all insulating materials, it is only necessary to clean the surface of specimens before tests. If specimens are subjected to any conditioning prior to the test, such as exposure to UV radiation, or to high humidity, the conditioning proc
30、edures should be described in detail. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All normative documents are subje
31、ct to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC493-1:1
32、974, Guide for the statistical analysis of ageing test data Part1: Methods based on mean values of normally distributed test results. 3 Definitions For the purpose of this International Standard, the following definitions apply. 3.1 tracking progressive degradation of the surface of a solid insulati
33、ng material by local discharges to form conducting or partially conducting paths 3.2 track conducting or partially conducting path created by tracking 3.3 electrical erosion wearing away of a solid insulating material by the action of electrical discharges without the formation of tracks 3.4 rotatin
34、g wheel life median time to failure under the specified test conditions. A failure occurs when a flashover of the test specimen takes place or the r.m.s. leakage current exceeds300mA 1) Different specimen shapes, dimensions and electrode spacings may be needed in special cases. Results with such non
35、-standard test specimens shall be used only for comparison with similar specimens. 2) In order to obtain a sufficient acceleration of the degradation process, the test conditions described in this standard are such as to cause surface discharges on all insulating materials. Under less severe conditi
36、ons, materials show a different ability to resist the formation of surface discharges. An assessment of this ability would be of considerable practical interest, but no standardized test for this purpose is available at the present time.EN61302:1995 4 BSI 03-2000 4 Test specimen 4.1 Specimen configu
37、ration As a standard test specimen a rod or a tube of circular cross-section shall be used. The outer diameter shall be25mm 1mm. Rods shall be used whenever practically possible. If a tube is used, the wall thickness must be sufficient to prevent the test liquid from leaking through the tube wall du
38、e to electric erosion during the test. The ends of the tube shall be carefully sealed to prevent ingress of the test liquid into the interior of the tube. The sealing material must not be able to diffuse along the outer surface of the tube and thus influence the test result. When needed to obtain su
39、fficient mechanical rigidity, a supporting rod of insulating material may be used inside the tube. A tubular electrode of stainless steel (see5.1) is mounted at each end of the test specimen. The edge of the electrode facing the opposite electrode shall be square-cut and have a close fit to the test
40、 specimen. The high-voltage electrode shall have an extension of0,2mm stainless-steel plate to form a sliding electrode that connects the specimen intermittently to the test voltage (see5.1). The distance between the electrodes shall be140mm2mm. An example of a specimen meeting this standard is show
41、n in Figure A.1 of Annex A. If specimens with other shapes and dimensions than specified in this standard are used, they shall be clearly described in the test report. The results obtained on such specimens shall be compared only with results obtained on similarly shaped specimens. 4.2 Preparation T
42、he surface of the specimens shall be cleaned with a suitable solvent 3) . 5 Test apparatus 5.1 General layout Up to10specimens are mounted on a1,0m to1,1m diameter pitch circle of a rotating wheel as outlined in Figure A.3 of Annex A. The wheel rotates three revolutions per minute. The specimens are
43、 mounted parallel to the axis of rotation with an inclination of15 2 to the horizontal with the high-voltage electrode in the lower position. The test voltage is applied intermittently to each specimen through a sliding electrode which slides along a semicircular busbar to which the voltage source i
44、s connected. The earth electrode of each specimen is connected to the voltage source through an individual overcurrent relay which disconnects the test voltage when the r.m.s. current exceeds300mA. Provisions can be made to measure the current continuously or intermittently during the test. An open
45、container holding approximately150l of salt solution is positioned so that the midpoint of the centreline of each test specimen is submerged during1/6 (60 ) of each revolution. After submersion the specimen is rotated during1/6 (60 ), and the test voltage is then applied during1/2 (180 ) of each rev
46、olution. Then the voltage is disconnected during1/6 (60 ) of a revolution before the specimen is submerged in the test liquid again, and the test cycle is repeated. All metal parts that are exposed to the test liquid shall be made of stainless steel containing approximately18% chromium and8% nickel.
47、 An example of a test apparatus that meets the requirements specified in this standard is shown in Figure A.2 to Figure A.5 of Annex A. 5.2 Electrical circuit 5.2.1 The test voltage is supplied from a48Hz to a62Hz a.c. power supply with an output r.m.s. voltage of10kV 0,5kV. The test voltage shall b
48、e measured with an accuracy of1,5%. The (transient) r.m.s. short-circuit current of the voltage source shall be at least10A at10kV. 5.2.2 The voltage source shall be equipped with a tripping device which disconnects the test voltage when a failure occurs without interrupting the rotation of the whee
49、l. Failed specimens should be removed and the test voltage re-applied as soon as practically possible. The wheel shall be inspected at least once every24h 4) . The accumulated time under voltage until failure occurs, shall be recorded for each specimen. A simplified circuit diagram of a test circuit that meets the requirements of this standard is shown as an example in Figure A.6 of Annex A. 5.3 Test liquid 5.3.1 The test liquid is prepared by adding sodium chloride (NaCl) to deionized or distilled water until a resistivity of7,57m 5%
