1、Insulators for overhead lines Insulator strings and sets forlines with a nominal voltagegreater than 1 000 V ACpower arc testsBS EN 61467:2008raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsNational forewordThis British Standard i
2、s the UK implementation of EN 61467:2008. It is identi-cal to IEC 61467:2008. It supersedes BS IEC 61467:1997 which is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteePEL/36, Insulators for power systems.A list of organizations represented on this committee can
3、be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2008ISBN 978 0 580 54261 9ICS 29.080.10; 29.240.20BRITISH STANDARDBS EN 61467:2008Compliance with a British Standard c
4、annot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on Amendments issued since publicationAmd. No. Date Text affectedMarch 200931EUROPEAN STANDARD EN 61467 NORME EUROPENNE EUROPISCHE NORM November 2008 CENE
5、LEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worl
6、dwide for CENELEC members. Ref. No. EN 61467:2008 E ICS 29.080.10; 29.240.20 English version Insulators for overhead lines - Insulator strings and sets for lines with a nominal voltage greater than 1 000 V - AC power arc tests (IEC 61467:2008) Isolateurs pour lignes ariennes - Chanes disolateurs et
7、chanes disolateurs quipes pour lignes de tension nominale suprieure 1 000 V - Essais darc de puissance en courant alternatif (CEI 61467:2008) Isolatoren fr Freileitungen - Isolatorstrnge und -ketten fr Leitungen mit einer Nennspannung grer 1 000 V - Wechselstrom-Hochleistungs-Lichtbogenprfungen (IEC
8、 61467:2008) This European Standard was approved by CENELEC on 2008-11-01. CENELEC members are 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 bib
9、liographical 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 responsibil
10、ity 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 electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Gree
11、ce, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61467:2008EN 61467:2008 - 2 - Foreword The text of document 36B/277/FDIS, future edition 1 of I
12、EC 61467, prepared by SC 36B, Insulators for overhead lines, of IEC TC 36, Insulators, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61467 on 2008-11-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publicat
13、ion of an identical national standard or by endorsement (dop) 2009-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61467:2008 was approv
14、ed by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60383-1 NOTE Harmonized as EN 60383-1:1996 (not modified). IEC 60383-2 NOTE Harmonized as EN 60383-2:1995 (not modified). _
15、BS EN 61467:2008- 3 - EN 61467:2008 Annex ZA(normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F
16、or undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC/TR 60797 -1)Residual streng
17、th of string insulator units of glass or ceramic material for overhead lines after mechanical damage of the dielectric - - IEC 60826 -1)Design criteria of overhead transmission lines - - 1)Undated reference. BS EN 61467:2008 2 61467 IEC:2008 CONTENTS 1 Scope and object6 2 Normative references .6 3 T
18、erms and definitions .6 4 Symbols and abbreviations.7 5 Characteristics of the test current.8 6 Supply and return circuit conditions 9 7 Tests on insulator sets .11 7.1 General remarks11 7.2 Test arrangement 11 7.3 Test current.11 7.4 Supply and return circuit conditions.11 7.5 Arc initiation 12 7.6
19、 Ambient conditions 14 7.7 Test series and characteristics of the power arcs 14 8 Tests on short strings .14 8.1 General remark .14 8.2 Test arrangement 15 8.3 Test current.15 8.4 Supply and return circuit conditions.15 8.5 Arc initiation 15 8.6 Ambient conditions 15 8.7 Test series and characterist
20、ics of the power arcs 16 9 Test report18 10 Evaluation of results.18 10.1 General remark .18 10.2 Visual examination 18 10.3 Porcelain or glass insulators18 10.4 Composite insulators.19 10.5 Acceptance criteria19 Annex A (normative) Examples of test arrangements and practical methods of tower simula
21、tion (return circuit) 20 Annex B (normative) Determination of the r.m.s. value of the current.25 Annex C (informative) No-load voltage of the power source .27 Annex D (informative) Power arcs on insulator sets and their true simulation by appropriate positioning of fusible wires .28 Annex E (informa
22、tive) Wind velocity during power arc tests .30 Annex F (informative) Variation of the fault current magnitude and reasons for the choice of the prescribed test parameters 31 Annex G (informative) Recommendations for the test report 33 Annex H (informative) Sample of a power arc test report .37 Bibli
23、ography40 Figure 1 Illustration of supply and return currents 10 Figure 2 Arc initiation.13 BS EN 61467:200861467 IEC:2008 3 Figure 3 Mounting arrangement for short strings 17 Figure A.1 Test arrangement of vertical insulator set .21 Figure A.2 Test arrangement of vertical insulator set using simpli
24、fied tower steel structure .22 Figure A.3 Test arrangement of Vee insulator set located in the centre of the tower (for the simplified tower steel structure and return circuit, see Figures A.1 and A.2)23 Figure A.4 Test arrangement of horizontal insulator (for the simplified tower steel structure an
25、d return circuit, see Figures A.1 and A.2) .24 Figure D.1 5 kA power arc test of a 145 kV string consisting of 7 cap and pin units.29 Figure F.1 Distribution of arc current (I) and its supply circuit components (IS1, IS2) along a 100 km long, 145 kV line connecting busbars of 28 kA short-circuit cur
26、rent 32 Table 1 Supply and return conditions .9 Table 2 Test series for insulator sets .14 Table 3 Test series for short insulator strings.16 Table 4 Test assessment criteria .19 BS EN 61467:2008 6 61467 IEC:2008 INSULATORS FOR OVERHEAD LINES INSULATOR STRINGS AND SETS FOR LINES WITH A NOMINAL VOLTA
27、GE GREATER THAN 1 000 V AC POWER ARC TESTS 1 Scope and object This International Standard applies to insulator strings and sets comprising string insulator units of ceramic material, glass or composite material for use on a.c. overhead lines and traction lines with a nominal voltage above 1 000 V an
28、d a frequency between 15 Hz and 100 Hz. This standard also applies to insulator strings or sets of similar design used in substations. This standard establishes a standard test procedure for power arc tests on insulator sets. It also establishes a standard test procedure for power arc tests on short
29、 strings. This standard does not apply to insulator sets mounted on non-metallic poles or towers. This standard cannot be directly applied to line post insulators or sets, or to insulating structures such as braced line-posts, since their mounting arrangement cannot be reproduced by the standard arr
30、angements as described herein. However, this standard can be used as a basis for agreement for tests on such insulators and arrangements. The object of this standard is to define the terms used, to prescribe a standard test procedure, to prescribe criteria to evaluate the results of the tests. Power
31、 arc tests are not an obligatory element of line insulator specifications. The standard test procedures and the evaluation criteria described in this standard are intended to provide testing guidance when power arc tests are felt to be necessary. It is not the object of this standard to introduce a
32、general obligation to execute these tests. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amen
33、dments) applies. IEC 60797, Residual strength of string insulator units of glass or ceramic material for overhead lines after mechanical damage of the dielectric IEC 60826, Design criteria of overhead transmission lines 3 Terms and definitions For the purposes of this document, the following terms a
34、nd definitions apply. NOTE Definitions of other terms used in this standard can be found in IEC 60050-471, IEC 60383-1 and IEC 60383-2. BS EN 61467:200861467 IEC:2008 7 3.1 test one application of the specified test current for the specified duration to the insulator string or set 3.2 test sequence
35、three successive tests on the same insulator string or set 3.3 test series a group of test sequences used to characterize the power arc performance of an insulator string or set 3.4 per cent initial asymmetry of current deviation of the current from a symmetrical wave during the first cycle of a pow
36、er arc NOTE Per cent initial asymmetry is expressed as a function of the absolute peak value of the current of the first cycle (Im) divided by the r.m.s. value of the current (I) as follows: 10012mII3.5 supply circuit electrical connection through which the current of a power arc flows to the line s
37、ide of the test object from the power source 3.6 return circuit electrical connection through which the current of power arc flows from the earth side of the test object to the power source 3.7 balanced circuit supply or return circuit in which the current flow is in two diametrically opposed direct
38、ions 3.8 unbalanced circuit supply or return circuit in which the current flow is principally in one direction 3.9 short string (cap and pin units) string of three to six insulator units having a minimum arcing distance of 400 mm 3.10 short string (long rod and composite units) string of one or more
39、 insulator units having an arcing distance between 400 mm and 1 000 mm 4 Symbols and abbreviations The following symbols and abbreviations are principally used in the tables and figures hereafter. Unless otherwise stated currents and voltages are expressed as r.m.s values. BS EN 61467:2008 8 61467 I
40、EC:2008 I Arc current InSpecified arc current t Arc time tnSpecified arc time ImPeak current value IR1,2Currents in the return circuit IS1,2Currents in the supply circuit IsysRated short-circuit current of the network system LALength of the insulator string LBLength of the insulator set LRLength of
41、simulation of the return circuit LSLength of simulation of the supply circuit D Distance from the centre point of the tested insulator set to the surrounding framework MLMechanical load on the tested insulator set Angle from the horizontal plane of a tension insulator set SFL Specified minimum (elec
42、tro-)mechanical failing load SML Specified mechanical load 5 Characteristics of the test current The tests shall be made with single-phase alternating current. Initial asymmetry (d.c. component) shall not exceed 30 %. NOTE This requirement is explained by the fact that the flashovers on a contaminat
43、ed insulator set in service generally occur in the vicinity of a voltage peak, consequently with a minimal direct current component. For 50 Hz or 60 Hz systems, the frequency of the test circuit shall be from 45 Hz to 65 Hz. For other system frequencies, the frequency of the test supply shall not in
44、 principle deviate from the specified value by more than 10 %. By agreement with the user, tests may be performed at a higher or lower frequency than the intended operating frequency. The frequencies may vary within the above limits during each test. The test circuit shall be adequate to supply the
45、specified values of arc current (r.m.s) and arc duration. Annex C gives information on no-load voltages suggested to achieve specified current values. Unless agreed otherwise, the permissible tolerance of the arc current with respect to the specified r.m.s. value of the current is 10 %. The actual a
46、rc current during the test shall be practically sinusoidal. The r.m.s. value of the test current may be derived from the arithmetic mean of the peak values during the test duration (see Annex B). If the measuring equipment permits, the r.m.s. value may be calculated from the current function. The te
47、st current shall be essentially constant over the arcing time. During the arcing time, the following deviations from the specified value are permissible: the arc current crest values shall not deviate from the specified value )2(nI by more than 20 %; for arcing times greater than 0,2 s, the above to
48、lerance may be exceeded during not more than 20 % of the total arcing time. In any case, the product of the actual arc current and duration It shall be within 10 % of the product of the specified arc current and duration In x tn. BS EN 61467:200861467 IEC:2008 9 In cases where the movement of the ar
49、c root onto the tower or along the line conductor occurs, these tolerances may be exceeded. 6 Supply and return circuit conditions The supply and return circuits depend on the service conditions, notably on the location of the insulator set along the line and on the tower geometry. The characteristic cases to be simulated in tests are given in Table 1 and illustrated in Figure 1 for complete sets and in Figure 3 for short strings. Ta
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