1、Impulse tests on cables and their accessories The European Standard EN 60230:2002 has the status of a British Standard ICs 29.060.20 BS EN 60230:2002 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 60230:2002 This British Standard, having been prepared under the directio
2、n of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 24 May 2002 National foreword This British Standard is the official English language version of EN 60230:2002. It is identical with IEC 60230:1966. The
3、UKparticipation in its preparation was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/16, Medium/high voltage cables, which has the responsibility to: - - aid enquirers to understand the text; present to the responsible international/Europe n committee nY enquiries
4、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 1997, all
5、IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period oftime during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cros s-r e ferenc es The British Stand
6、ards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standar
7、d 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 ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an
8、inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.No. I Date I Comments O BSI 24 May 2002 ISBN O 580 39642 8 EUROPEAN STAND
9、ARD NORME EUROPENNE EUROPISCHE NORM EN 60230 April 2002 ICs 29.060.20 Supersedes HD 48 S1:1977 English version Impulse tests on cables and their accessories (IEC 60230: 1966) Essais de choc des cbles et de leurs accessoires (CE1 60230:1966) S tos pan n u ngs prfu ngen an Ka bel n und deren Garniture
10、n (IEC 60230:1966) This European Standard was approved by CENELEC on 2002-03-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists an
11、d bibliographical references concerning such national standards may be obtained on application to 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 respon
12、sibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the oficial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy
13、, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35,
14、 B - 1050 Brussels O 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60230:2002 E Page 2 EN 60230:2002 Foreword The text of the International Standard IEC 60230:1966, prepared by IEC TC 20, Electric cables, was approved by CE
15、NELEC as HD 48 SI on 1974-05-07. This Harmonization Document was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 60230 on 2002-03-01. The following date was fixed: - latest date by which the EN has to be implemented at national level by publicat
16、ion of an identical national standard or by endorsement (dop) 2003-03-01 Endorsement not i ce The text of the International Standard IEC 60230:1966 was approved by CENELEC as a European Standard without any modification. O BSI 24 May 2002 Page 3 EN 60230:2002 CONTENTS Page Clause SECTION ONE GENERAL
17、 1. Object and scope . 4 2. Characteristics of the test installation to be subjected to the tests . 4 3. State of the test installation 4 4. Shape ofthe impulse waves 5 5. Calibration of impulse generator . 5 SECTION Two WITHSTAND TESTS Application of the impulses at the level specified . 6. 5 SECTI
18、ON THREE TESTS ABOVE THE WITHSTAND LEVEL 7. Application of impulse test above the specified withstand level and omission of power- fi-equency test 6 8. Procedure for tests above the withstand level 6 O BSI 24 May 2002 Page 4 EN 60230:2002 IMPULSE TESTS ON CABLES AND THEIR ACCESSORIES SECTION ONE - G
19、ENERAL 1. Object and scope 1.1 The object of this Recominendation is to lay down the conditions and procedure for carrying out impulse tests on cables anid their accessories, with a view to rationalizing the practice in different laboratories, and thus to facilitate valid comparisons between the res
20、ults obtained on cables made to different specifications. 1.2 This Recommendation applies solely to the methods of carrying out the tests as such, independently of the problem of selecting the test levels to be specified. 1.3 It is applicable to high-voltage cables of all types. 1.4 The Recommendati
21、on is divided into three sections. In Section One, the characteristics and state of the test installation and those parts of the procedure which are common to withstand tests and tests above the withstand level are described. Section Two describes the procedure for carrying out withstand tests. Sect
22、ion Three of this Recommendation describes the procedure for carrying out tests above the withstand lleve1 and is intended for research purposes. 2. Characteristics of the test installation to be subjected to the tests 2.1 All samples of cable to be included in the test installation shall have been
23、subjected to the bending operation included as part of the bending test in the relevant I E C Recommendation. Note. - Different mechanical operations may be appropriate to cables for special conditions of service, e.g. submarine cables. These should be the subject of agreement between the purchaser
24、and the manufacturer, if not described in the relevant I E C liecommendation. 2.2 The length of the sample taken shall be such that the length of cable between the lower parts of the sealing ends is at least 5 m, if the test installation is not intended to include any other accessory. 2.3 Where one
25、joint is included in the test installation, the minimum length of freecable, between the joint and the bottom of each sealing end, shall be 5 m. Where more than one joint is included, the same requirement shall be observed and in addition there shall be a minimum length of 3 m of free cable between
26、successive joints. 3. State of the test installation The test installation shall be maintained under the following conditions : 3.1 Pressure conditions For gas-pressure and oil-filled cables, the pressure shall be adjusted in accordance with the relevant I E C Recommendation. 3.2 Temperature conditi
27、ons The temperature conditions and the method of temperature measurement shall be as described in the relevant I E C Recornmendation, but other methods of temperature measurement may be used by agreement between the purchaser and the manufacturer. O BSI 24 May 2002 Page 5 EN 60230:2002 4. 5. 6. Shap
28、e of the impulse waves: The impulse waves applied shall have a wave front of a duration between 1 ps and 5 ps, and a duration to half the peak value of 50 f 10 ps. They shall further comply with I E C Publication 60, High-voltage Test Techniques, where applicable. Calibration of impulse generator Im
29、mediately before cir during the period when the temperature of the cable is maintained at a constant value, preparatory to the application of the impulses, the generator shall be calibrated, with positive polarity, under the following conditions : Both ends of the test assembly shall be connected to
30、 the impulse generator. A measuring sphere- gap and an oscillograph, with its associated voltage divider, shall be connected in parallel and remain so connected throughout the test. For every setting of the sphere-gap, the charging voltage of the generator shall be so adjusted as to give 50% flashov
31、er of the gap (see Sub-clause 6.3.1.2 of I E C Publication 60) and an oscillo- gram of the impulse voltage shall be taken. This procedure shall be carried out for at least three .different settings of the sphere-gap. The settings shall be so selected that their 50 % flashover voltages are approximat
32、ely 50 %, 615 % and 80 % of the test level specified. A curve showing the charging voltage as a function of the sphere-gap flashover voltage shall be drawn for this positive polarity. This curve, which should be a straight line, shall be extrapolated to determine the charging voltage necessary to ob
33、tain the specified level with positive polarity. The ratio of the voltage divider shall be so selected for this polarity as to take into account the maximum flashover voltages for the sphere-gap and the voltage oscillograms that have to be obtained. This value for the ratio of the voltage divider sh
34、all be used for all the oscillograms taken in the course of the series of tests with this polarity. Other peak voltage measuring devices may be used in place of, or in addition to, the sphere-gap, but such devices shall comply with I E C Publication 60. Thus, if a peak voltage measuring device is us
35、ed in addition to an oscillograph, in conjunction with the voltage divider, and this instrument and the divider both comply with I E C Publication 60, the impulse generator may be calibrated by adjusting the charging voltage to give approximately 50 %, 65 % and 80 % of the test level specified. SECT
36、ION Two - WITHSTAND TESTS Application of the impulse; at the level speciied 6.1 With the sphere-gap setting increased so that no flashover occurs across the gap, and with the cable maintained at the required temperature, the test installation shall be subjected to a series of 10 positive impulses at
37、 the voltage specified. The time interval between two successive impulses shall be just sucient to ensure that the impulse generator is charged at the correct voltage. 6.2 Immediately after the aplplication of the 10 positive impulses, the generator shall be re-calibrated for negative polarity under
38、 the conditions specified in Clause 5, and a series of 10 negative impulses of the same specified voltage shall then be applied to the test assembly. 6.3 Oscillograms shall be taken of at least the first and tenth impulses in each series. The oscillograms shall include a timing 0sc:illation. 6.4 The
39、 ambient temperature, the cable temperature and, where applicable, the gas or oil pressure, shall be checked during the test. O BSI 24 May 2002 Page 6 EN 60230:2002 SECTION THREE - TESTS ABOVE THE WITHSTAND LEVEL 7. Application of impulse test above the specified withstand level and omission of powe
40、r-frequency test 7.1 When, for research purposes, impulse tests to levels above the withstand level are made, the procedure given below is recommended. 7.2 In this case, the power-frequency test at ambient temperature, included in I E C Publications 141-1, 141-2 and 141-3, Tests on Cil-iled and Gas-
41、pressure Cables and their Accessories may be omitted, provided that there is no doubt that the test instailation has successfully passed the impulse withstand voltage test. If the last oscillogram does not show this clearly, further impulse voltages may be applied at withstand level to obtain a good
42、 oscillogram. 8. Procedure for tests above the withstand level 8.1 With the temperature conditions as speded in Sub-clause 3.2, impulses shall be applied in the following sequence : 1) 10 negative impulses at withstand voltage plus approximately 5 %; 2) 5 positive impulses, the first at 50 % of the
43、value used for I) and the remainder at progressively increasing values up to 85 % of the value used for 1) ; 3) 10 positive impulses at withstand voltage plus approximately 5 %; 4) 10 positive impulses at withstand voltage plus approximately 10%; 5) 5 negative impulses, the first at 50 % of the valu
44、e used for 4) and the remainder at progressively increasing values up to 85 % of the value used for 4); 6) 10 negative impulses at withstand voltage plus approximately 10 %. 8.2 The sequence speded in Sub-clause 8.1 shall be repeated, the test voltage being increased in steps of approximately 5 %. T
45、hus, steps 7) and 9) will be at withstand voltage plus approximately 15 %; steps 10) and 12) at withstand voltage plus 20%; and so on. 8.3 The best shall continue until the desired voltage is reached, or until breakdown occurs. 8.4 Oscillograms shall be taken of at least the first and tenth impulses
46、 of each senes. 8.5 In general, no recalibration of the generator is necessary throughout this series of tests and the voltage can be determined by extrapolation from the original calibration. When, however, the margin between the test voltage and the maximum voltage used for the original calibratio
47、n is considered too large for accurate resulk;, a fresh calibration may be necessary. (See Sub-clause 6.2.5.2 of I E C Publication 60.) O BSI 24 May 2002 BS EN 60230:2002 B SI 389 Chiswick High Road London w4 4AL BSI -British Standards Institution BSI is the independent national body responsible for
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