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1、BRITISH 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 ? Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS E
2、N 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 foreword This British Standard is the official English language version of EN 60044-3:2003. It is identical with IEC 6004
3、4-3:2002. It supersedes BS 7628:1993 which will be withdrawn on 2005-12-01.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 transformers, which has the responsibility to: A list of organizations represented on this committee can be obtained on request
4、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 the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Elect
5、ronic 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 application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to u
6、nderstand the text; present to the responsible international/European committee any 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. Summary of pages This document comp
7、rises 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 the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun she
8、ffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60044-3 NORME EUROPENNE EUROPISCHE NORM January 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnis
9、che 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 members. Ref. No. EN 60044-3:2003 E ICS 17.220.20; 29.180 Supersedes HD 548.3 S1:1992 English version Instrument transformers P
10、art 3: Combined transformers (IEC 60044-3:2002) Transformateurs de mesure Partie 3: Transformateurs combins (CEI 60044-3:2002) Messwandler Teil 3: Kombinierte Wandler (IEC 60044-3:2002) This European Standard was approved by CENELEC on 2002-12-01. CENELEC members are bound to comply with the CEN/CEN
11、ELEC 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 or to any
12、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 official versi
13、ons. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy
14、: sheffieldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of document 38/287/FDIS, future edition 2 of IEC 60044-3, prepared by IEC TC 38, Instrument transformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 6
15、0044-3 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 following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national s
16、tandard 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 “informative“ are given for information only. In this standard, annex A is informative. _ Endorsement notice The text of the Interna
17、tional Standard IEC 60044-3:2002 was approved by CENELEC as a European Standard without any modification. _ Page 2 EN 600443:2003 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -440063 ? 2002:CEI 3 CONTENTS 1Scope and object5 2Definitions 5
18、 3Normal and special service conditions.5 4Ratings.5 4.1General .5 4.2Limits of temperature rise 5 5Design requirements.6 5.1General .6 5.2Transmitted overvoltages.6 6Tests6 6.1Classification of tests.6 6.2Type tests .7 6.3Routine tests .7 6.4Special tests8 7Type tests.8 7.1General .8 7.2Temperature
19、-rise test 8 7.3Impulse tests on primary windings .9 8Routine tests 9 8.1General .9 8.2Power-frequency withstand test on the primary winding9 9Special tests.9 9.1General .9 9.2Measurement of capacitance and dielectric dissipation factor.9 9.3Transmitted overvoltage measurement 9 10Marking 10 10.1Rat
20、ing plate marking10 10.2Terminal marking.10 11Additional requirements for measuring and protective combined transformer.11 11.1General .11 11.2Mutual influence 11 11.3Type test for accuracy of measuring and protective combined transformer .11 11.4Routine accuracy tests for measuring and protective c
21、ombined transformers14 Annex A (informative) The mutual influence of current and voltage transformers.19 Figure 1 Geometrical construction of the circuit 15 Figure 2 Measurement 2 .16 Figure 3 Measurement 3.16 Page 3 EN 600443:2003 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+
22、00:00 2006, Uncontrolled Copy, (c) BSI -440063 ? 2002:CEI 4 Figure 4 Error diagram of a voltage transformer class 0,2.16 Figure 5 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 Fig
23、ure A.1 Current conductor and magnetic field influencing a voltage transformer 20 Page 4 EN 600443:2003 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -440063 ? 2002:CEI 5 INSTRUMENT TRANSFORMERS Part 3: Combined transformers 1 Scope and ob
24、ject This part of IEC 60044 applies to newly manufactured combined transformers for use with electrical measuring instruments and 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,
25、IEC 60044-2 and IEC/PAS 60044-5 cover current, voltage and capacitor voltage transformers, that are necessary for combined instrument 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 c
26、ombined instrument transformer instrument transformer consisting of a current and a voltage transformer in the same case 3 Normal 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 r
27、espectively. 4 Ratings 4.1 General For the purposes of this part of IEC 60044, in addition to Clause 4 of IEC 60044-1 and Clause 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 appropriat
28、e 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 applied 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 facto
29、r burden corresponding to the rated output and with the voltage transformer being loaded at rated burden, or at the highest rated 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 tr
30、ansformers is also applicable for the current transformers of the combined instrument transformers. Page 5 EN 600443:2003 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -440063 ? 2002:CEI 6 5 Design requirements 5.1 General For the purposes
31、 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 respectively, unless otherwise specified below. 5.2 Transmitted overvoltages These requirements apply to combined instrument transformers having Um ? 72,5 kV. The characteris
32、tics of the impulse voltage applied to the primary windings for which the requirements are stated are the following: peak value of the applied voltage (Up): m 3 2 1,6U? conventional front time (T1):0,50 ?s ? 20 % time to half-value (T2):?50 ?s The peak values of the overvoltages transmitted from the
33、 primary to the secondary terminals (Us), for both current and voltage transformers, shall not exceed 1,6 kV, under the test 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 transmitt
34、ed overvoltage limits may be agreed upon between manufacturer and purchaser. The transmitted overvoltage peak limits of 1,6 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 Class
35、ification of tests The test specified in this standard are classified as type tests, routine tests and special tests. Type 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. NOT
36、E A type test may also be considered valid if it is made on a transformer which has minor deviations. Such deviations should be subject to agreement between manufacturer and purchaser. Routine test A test to which each individual transformer is subjected. Page 6 EN 600443:2003 Licensed Copy: sheffie
37、ldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -440063 ? 2002:CEI 7 Special test 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
38、relevant subclauses: a) short-time current test on current transformers (see 7.1 of IEC 60044-1); b) temperature-rise test (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
39、 (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); 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
40、on voltage transformers (see 8.2 of IEC 60044-2); g) determination of errors (see Clause 11); h) measurement of the radio 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
41、 has been subjected to the dielectric type test of this subclause, it shall be subjected to all the routine tests of 6.3. 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 60
42、044-2 for voltage transformers); b) power-frequency withstand test on the primary winding (see 8.2 and see also 8.2 of 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
43、-frequency withstand test on secondary windings (see 8.3 of IEC 60044-1 for current transformers and 9.3 of IEC 60044-2 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)
44、inter-turn overvoltage test for current transformers (see 8.4 of IEC 60044-1); g) determination of errors (see 11.4). The 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
45、at 80 % of the specified test voltage. Page 7 EN 600443:2003 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:39 GMT+00:00 2006, 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)
46、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 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 6
47、0044-2 for voltage transformers); c) multiple chopped impulse tests on the primary winding for current transformers (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 Gen
48、eral 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 current 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 t
49、his 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 C and 30 C. When there is more than one secondary winding, the tests shall be made with the appropriate rated burden connected to each secondary winding unless otherwise agreed between manufacturer and user. For the test, t