1、Licensed Copy: Wang Bin, ISO/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSIBRITISH STANDARD BS EN 60044-3:2003 Instrument transformers Part 3: Combined transformers The European Standard EN 60044-3:2003 has the status of a British Standard ICS 17.220.20; 29.180
2、 Licensed Copy: Wang Bin, ISO/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSIBS EN 60044-3:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 5 March 2003 BSI 5 March 2003 ISBN 0 580 41354 3 National fo
3、reword This British Standard is the official English language version of EN 60044-3:2003. It is identical with IEC 60044-3:2002. It supersedes BS 7628:1993 which will be withdrawn on 2005-12-01. The UK participation in its preparation was entrusted to Technical Committee PEL/38, Instrument transform
4、ers, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under
5、the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applic
6、ation. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; mon
7、itor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 20, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when
8、 the document was last issued. Amendments issued since publication Amd. No. Date Comments Licensed Copy: Wang Bin, ISO/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 60044-3 NORME EUROPENNE EUROPISCHE NORM January 2003 CENELEC European Commi
9、ttee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC
10、members. Ref. No. EN 60044-3:2003 E ICS 17.220.20; 29.180 Supersedes HD 548.3 S1:1992English version Instrument transformers Part 3: Combined transformers (IEC 60044-3:2002) Transformateurs de mesure Partie 3: Transformateurs combins (CEI 60044-3:2002) Messwandler Teil 3: Kombinierte Wandler (IEC 60
11、044-3:2002) This European Standard was approved by CENELEC on 2002-12-01. 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 bibl
12、iographical 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 responsibili
13、ty 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, I
14、taly, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, ISO/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSIForeword The text of document 38/287/FDIS, future edition 2 of IEC 60044-
15、3, prepared by IEC TC 38, Instrument transformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60044-3 on 2002-12-01. This European Standard supersedes HD 548.3 S1:1992. This standard shall be used in conjunction with EN 60044-1:1999 and EN 60044-2:1999. The foll
16、owing dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2003-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-12-01 Annexes designated
17、 “informative“ are given for information only. In this standard, annex A is informative. _ Endorsement notice The text of the International Standard IEC 60044-3:2002 was approved by CENELEC as a European Standard without any modification. _ Page2 EN600443:2003Licensed Copy: Wang Bin, ISO/Exchange Ch
18、ina Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSI-440063 2002:CEI 3 CONTENTS 1 Scope and object5 2 Definitions 5 3 Normal and special service conditions.5 4 Ratings.5 4.1 General .5 4.2 Limits of temperature rise 5 5 Design requirements.6 5.1 General .6 5.2 Transmitted overv
19、oltages.6 6 Tests6 6.1 Classification of tests.6 6.2 Type tests .7 6.3 Routine tests .7 6.4 Special tests8 7 Type tests.8 7.1 General .8 7.2 Temperature-rise test 8 7.3 Impulse tests on primary windings .9 8 Routine tests 9 8.1 General .9 8.2 Power-frequency withstand test on the primary winding9 9
20、Special tests.9 9.1 General .9 9.2 Measurement of capacitance and dielectric dissipation factor.9 9.3 Transmitted overvoltage measurement 9 10 Marking 10 10.1 Rating plate marking10 10.2 Terminal marking.10 11 Additional requirements for measuring and protective combined transformer .11 11.1 General
21、 .11 11.2 Mutual influence 11 11.3 Type test for accuracy of measuring and protective combined transformer .11 11.4 Routine accuracy tests for measuring and protective combined transformers14 Annex A (informative) The mutual influence of current and voltage transformers.19 Figure 1 Geometrical const
22、ruction of the circuit 15 Figure 2 Measurement 2 .16 Figure 3 Measurement 3.16 Page3 EN600443:2003Licensed Copy: Wang Bin, ISO/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSI-440063 2002:CEI 4 Figure 4 Error diagram of a voltage transformer class 0,2.16 Figure 5
23、 Error diagram of a current transformer class 0,2 at 5 % of rated current.17 Figure 6 Transmitted overvoltage measurements17 Figure 7 Waveshape of the input voltage 18 Figure A.1 Current conductor and magnetic field influencing a voltage transformer 20 Page4 EN600443:2003Licensed Copy: Wang Bin, ISO
24、/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSI-440063 2002:CEI 5 INSTRUMENT TRANSFORMERS Part 3: Combined transformers 1 Scope and object This part of IEC 60044 applies to newly manufactured combined transformers for use with electrical measuring instruments a
25、nd electrical protective devices at frequencies from 15 Hz to 100 Hz. The requirements and tests of this standard, in addition to the requirements and tests of IEC 60044-1, IEC 60044-2 and IEC/PAS 60044-5 cover current, voltage and capacitor voltage transformers, that are necessary for combined inst
26、rument transformers. 2 Definitions For the purposes of this part of IEC 60044, the definitions given in IEC 60044-1 and IEC 60044-2 and the following definition apply. 2.1 combined instrument transformer instrument transformer consisting of a current and a voltage transformer in the same case 3 Norm
27、al and special service conditions For the purposes of this part of IEC 60044, Clause 3 of IEC 60044-1 and Clause 4 of IEC 60044-2 apply to current and voltage transformers respectively. 4 Ratings 4.1 General For the purposes of this part of IEC 60044, in addition to Clause 4 of IEC 60044-1 and Claus
28、e 5 of IEC 60044-2, the following subclause applies. 4.2 Limits of temperature rise The temperature rise of a combined instrument transformer shall not exceed the appropriate values of 4.6 of IEC 60044-1 and of 5.4 of IEC 60044-2, respectively, if a voltage as indicated in IEC 60044-2, 5.4, is appli
29、ed to it and the current transformer is carrying a primary current equal to the rated continuous thermal current. The current transformer is connected to a unity power factor burden corresponding to the rated output and with the voltage transformer being loaded at rated burden, or at the highest rat
30、ed burden if there are several rated burdens, and at a power factor between 0,8 lagging and unity. The additional tolerance of 10 K proposed in some cases for the voltage transformers is also applicable for the current transformers of the combined instrument transformers. Page5 EN600443:2003Licensed
31、 Copy: Wang Bin, ISO/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSI-440063 2002:CEI 6 5 Design requirements 5.1 General For the purposes of this part of IEC 60044, Clause 5 of IEC 60044-1 and Clause 6 of IEC 60044-2 apply to the current and voltage transformers
32、 respectively, unless otherwise specified below. 5.2 Transmitted overvoltages These requirements apply to combined instrument transformers having U m 72,5 kV. The characteristics of the impulse voltage applied to the primary windings for which the requirements are stated are the following: peak valu
33、e of the applied voltage (U p ): m 3 2 1,6 U conventional front time (T 1 ): 0,50 s 20 % time to half-value (T 2 ): 50 s The peak values of the overvoltages transmitted from the primary to the secondary terminals (U s ), for both current and voltage transformers, shall not exceed 1,6 kV, under the t
34、est and measuring conditions described in 9.3. NOTE 1 The wave-shape characteristics are representative of voltage oscillations due to switching operations. NOTE 2 Other transmitted overvoltage limits may be agreed upon between manufacturer and purchaser. The transmitted overvoltage peak limits of 1
35、,6 kV, measured in accordance with the methods specified in 9.3, should ensure sufficient protection of electronic equipment connected to the secondary windings. 6 Tests 6.1 Classification of tests The test specified in this standard are classified as type tests, routine tests and special tests. Typ
36、e test A test made on a transformer of each type to demonstrate that all transformers made to the same specification comply with the requirements not covered by routine tests. NOTE A type test may also be considered valid if it is made on a transformer which has minor deviations. Such deviations sho
37、uld be subject to agreement between manufacturer and purchaser. Routine test A test to which each individual transformer is subjected. Page6 EN600443:2003Licensed Copy: Wang Bin, ISO/Exchange China Standards Information Centre, 16 June 2003, Uncontrolled Copy, (c) BSI-440063 2002:CEI 7 Special test
38、A test other than a type or a routine test, agreed on by manufacturer and purchaser. 6.2 Type tests The following tests are type tests; for details, reference should be made to the relevant subclauses: a) short-time current test on current transformers (see 7.1 of IEC 60044-1); b) temperature-rise t
39、est (see 7.2); c) lighting impulse test (see 7.3 and also 7.3.2 of IEC 60044-1 for current transformers and 8.3.2 of IEC 60044-2 for voltage transformers); d) switching impulse test (see 7.3 and see also 7.3.3 of IEC 60044-1 for current transformers and 8.3.3 of IEC 60044-2 for voltage transformers)
40、; e) wet test for outdoor transformers (see 7.4 of IEC 60044-1 for current transformers and 8.4 of IEC 60044-2 for voltage transformers); f) short-circuit withstand capability test on voltage transformers (see 8.2 of IEC 60044-2); g) determination of errors (see Clause 11); h) measurement of the rad
41、io interference voltage (RIV) (see 8.5 of IEC 60044-2). All the dielectric type tests shall be carried out on the same transformer, unless otherwise specified. After the transformer has been subjected to the dielectric type test of this subclause, it shall be subjected to all the routine tests of 6.
42、3. 6.3 Routine tests The following tests apply to each individual transformer: a) verification of terminal marking (see 8.1 of IEC 60044-1 for current transformers and 9.1 of IEC 60044-2 for voltage transformers); b) power-frequency withstand test on the primary winding (see 8.2 and see also 8.2 of
43、IEC 60044-1 for current transformers and 9.2 of IEC 60044-2 for voltage transformers); c) partial discharge measurement for voltage transformers (see 9.2.4 of IEC 60044-2); d) power-frequency withstand test on secondary windings (see 8.3 of IEC 60044-1 for current transformers and 9.3 of IEC 60044-2
44、 for voltage transformers); e) power-frequency withstand test between sections (see 8.3 of IEC 60044-1 for current transformers and 9.3 of IEC 60044-2 for voltage transformers); f) inter-turn overvoltage test for current transformers (see 8.4 of IEC 60044-1); g) determination of errors (see 11.4). T
45、he order of the tests is not standardized but the determination of errors shall be performed after each test. Repeated power-frequency tests on primary windings should be performed at 80 % of the specified test voltage. Page7 EN600443:2003Licensed Copy: Wang Bin, ISO/Exchange China Standards Informa
46、tion Centre, 16 June 2003, Uncontrolled Copy, (c) BSI-440063 2002:CEI 8 6.4 Special tests The following tests shall be performed upon agreement between manufacturer and purchaser: a) chopped impulse test on the primary winding (see 7.3 and also 9.1 of IEC 60044-1 for current transformers and 10.1 of
47、 IEC 60044-2 for voltage transformers); b) measurement of capacitance and dielectric dissipation factor (see 9.2 and also 9.2 of IEC 60044-1 for current transformers and 10.2 of IEC 60044-2 for voltage transformers); c) multiple chopped impulse tests on the primary winding for current transformers (
48、see 7.3 and also annex B of IEC 60044-1); d) mechanical test for voltage transformers (see 10.3 of IEC 60044-2); e) transmitted overvoltage measurement (see 9.3). 7 Type tests 7.1 General For the purposes of this part of IEC 60044, Clause 7 of IEC 60044-1 and Clause 8 of IEC 60044-2 apply to the cur
49、rent and voltage transformer respectively, unless otherwise specified below. 7.2 Temperature-rise test A test shall be made in order to prove compliance with 4.2. For the purpose of this test, combined instrument transformers shall be considered to have attained a steady-state temperature when the rate of temperature rise does not exceed 1 K/h. The ambient temperature may be between 10
