Instrument transformers -- Part 3: Combined transformers

Supersedes HD 548.3 S1:1992

Messwandler -- Teil 3: Kombinierte Wandler

Transformateurs de mesure -- Partie 3: Transformateurs combinés

Rassemble les prescriptions pour les transformateurs de courant et les transformateurs de tension combinés dans une enveloppe commune, qu'il convient d'ajouter aux prescriptions des EN 60185 et 60186.

Instrument transformers - Part 3: Combined transformers

General Information

Status
Withdrawn
Publication Date
31-Aug-2003
Withdrawal Date
16-Jan-2017
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
17-Jan-2017
Due Date
09-Feb-2017
Completion Date
17-Jan-2017

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SIST EN 60044-3:2003SLOVENSKIseptember 2003
STANDARDInstrument transformers - Part 3: Combined transformers©

Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 60044-3:2003(en)ICS17.220.20

EUROPEAN STANDARD
EN 60044-3 NORME EUROPÉENNE EUROPÄISCHE NORM

January 2003 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für 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 members.

Ref. No. EN 60044-3:2003 E
ICS 17.220.20; 29.180 Supersedes HD 548.3 S1:1992
English version
Instrument transformers Part 3: Combined transformers (IEC 60044-3:2002)
Transformateurs de mesure Partie 3: Transformateurs combinés (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/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 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 responsibility 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, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

EN 60044-3:2003 - 2 - 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 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 following 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 "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. __________

NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD60044-3Deuxième éditionSecond edition2002-12Transformateurs de mesure –Partie 3:Transformateurs combinésInstrument transformers –Part 3:Combined transformersPour prix, voir catalogue en vigueurFor price, see current catalogue© IEC 2002

Droits de reproduction réservés

Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized in anyform or by any means, electronic or mechanical, includingphotocopying and microfilm, without permission in writing fromthe publisher.International Electrotechnical Commission,

3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11

Telefax: +41 22 919 03 00
E-mail: inmail@iec.ch

Web: www.iec.chCODE PRIXPRICE CODESCommission Electrotechnique InternationaleInternational Electrotechnical Commission

60044-3 ¤ IEC:2002– 3 –CONTENTSFOREWORD..........................................................................................................................71Scope and object............................................................................................................112Definitions.......................................................................................................................113Normal and special service conditions.............................................................................114Ratings...........................................................................................................................114.1General.................................................................................................................114.2Limits of temperature rise......................................................................................115Design requirements.......................................................................................................135.1General.................................................................................................................135.2Transmitted overvoltages.......................................................................................136Tests..............................................................................................................................136.1Classification of tests.............................................................................................136.2Type tests..............................................................................................................156.3Routine tests..........................................................................................................156.4Special tests..........................................................................................................177Type tests.......................................................................................................................177.1General.................................................................................................................177.2Temperature-rise test.............................................................................................177.3Impulse tests on primary windings..........................................................................198Routine tests...................................................................................................................198.1General.................................................................................................................198.2Power-frequency withstand test on the primary winding..........................................199Special tests...................................................................................................................199.1General.................................................................................................................199.2Measurement of capacitance and dielectric dissipation factor.................................199.3Transmitted overvoltage measurement...................................................................1910Marking...........................................................................................................................2110.1Rating plate marking..............................................................................................2110.2Terminal marking...................................................................................................2111Additional requirements for measuring and protective combined transformer...................2311.1General.................................................................................................................2311.2Mutual influence.....................................................................................................2311.3Type test for accuracy of measuring and protective combined transformer..............2311.4Routine accuracy tests for measuring and protective combined transformers..........29Annex A (informative)

The mutual influence of current and voltage transformers...................39Figure 1 – Geometrical construction of the circuit...................................................................31Figure 2 – Measurement 2...................................................................................................33Figure 3 – Measurement 3.....................................................................................................33

60044-3 ¤ IEC:2002– 5 –Figure 4 – Error diagram of a voltage transformer class 0,2...................................................33Figure 5 – Error diagram of a current transformer

class 0,2 at 5 % of rated current...............35Figure 6 – Transmitted overvoltage measurements................................................................35Figure 7 – Waveshape of the input voltage............................................................................37Figure A.1 – Current conductor and magnetic field

influencing a voltage transformer.............41

60044-3 ¤ IEC:2002– 7 –INTERNATIONAL ELECTROTECHNICAL COMMISSION____________INSTRUMENT TRANSFORMERS –Part 3: Combined transformersFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the International Organizationfor Standardization (ISO) in accordance with conditions determined by agreement between the twoorganizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60044-3 has been prepared by IEC technical committee 38:Instrument transformers.The text of this standard is based on the following documents:FDISReport on voting38/287/FDIS38/291/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.Annex A is for information only.This standard shall be used in conjunction with IEC 60044-1 and IEC 60044-2.This standard is Part 3 of IEC 60044, published under the general title Instrument transformers.Apart from this standard, this series consists of the following parts:IEC 60044-1:1996, Instrument transformers – Part 1: Current transformers

60044-3 ¤ IEC:2002– 9 –IEC 60044-2:1997, Instrument transformers – Part 2: Inductive voltage transformersIEC/PAS 60044-5, Instrument transformers – Part 5: Capacitor voltage transformersIEC 60044-6:1992, Instrument transformers – Part 6: Requirements for protective currenttransformers for transient performanceIEC 60044-7:1999, Instrument transformers – Part 7: Electronic voltage transformersThe committee has decided that the contents of this publication will remain unchanged until2005-12. At this date, the publication will be•reconfirmed;•withdrawn;•replaced by a revised edition, or•amended.

60044-3 ¤ IEC:2002– 11 –INSTRUMENT TRANSFORMERS –Part 3: Combined transformers1 Scope and objectThis part of IEC 60044 applies to newly manufactured combined transformers for use withelectrical measuring instruments and electrical protective devices at frequencies from 15 Hzto 100 Hz.The requirements and tests of this standard, in addition to the requirements and tests ofIEC 60044-1, IEC 60044-2 and IEC/PAS 60044-5 cover current, voltage and capacitor voltagetransformers, that are necessary for combined instrument transformers.2 DefinitionsFor the purposes of this part of IEC 60044, the definitions given in IEC 60044-1 andIEC 60044-2 and the following definition apply.2.1combined instrument transformerinstrument transformer consisting of a current and a voltage transformer in the same case3 Normal and special service conditionsFor the purposes of this part of IEC 60044, Clause 3 of IEC 60044-1 and Clause 4 ofIEC 60044-2 apply to current and voltage transformers respectively.4 Ratings4.1 GeneralFor the purposes of this part of IEC 60044, in addition to Clause 4 of IEC 60044-1 and Clause5 of IEC 60044-2, the following subclause applies.4.2 Limits of temperature riseThe temperature rise of a combined instrument transformer shall not exceed the appropriatevalues of

4.6 of IEC 60044-1 and of
5.4 of IEC 60044-2, respectively, if a voltage as indicatedin IEC 60044-2,

5.4, is applied to it and the current transformer is carrying a primary currentequal to the rated continuous thermal current. The current transformer is connected to a unitypower factor burden corresponding to the rated output and with the voltage transformer beingloaded at rated burden, or at the highest rated burden if there are several rated burdens, and ata power factor between 0,8 lagging and unity. The additional tolerance of 10 K proposed insome cases for the voltage transformers is also applicable for the current transformers of thecombined instrument transformers.

60044-3 ¤ IEC:2002– 13 –5 Design requirements5.1 GeneralFor the purposes of this part of IEC 60044, Clause 5 of IEC 60044-1 and Clause 6 ofIEC 60044-2 apply to the current and voltage transformers respectively, unless otherwisespecified below.5.2 Transmitted overvoltagesThese requirements apply to combined instrument transformers having Um≥ 72,5 kV.The characteristics of the impulse voltage applied to the primary windings for which therequirements are stated are the following:–peak value of the applied voltage (Up):m321,6U××–conventional front time (T1):0,50 µs± 20 %–time to half-value (T2):≥50µsThe peak values of the overvoltages transmitted from the primary to the secondary terminals(Us), for both current and voltage transformers, shall not exceed 1,6 kV, under the test andmeasuring 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 1,6 kV, measured in accordance with the methodsspecified in 9.3, should ensure sufficient protection of electronic equipment connected to thesecondary windings.6 Tests6.1 Classification of testsThe test specified in this standard are classified as type tests, routine tests and special tests.Type testA test made on a transformer of each type to demonstrate that all transformers made to thesame 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. Suchdeviations should be subject to agreement between manufacturer and purchaser.Routine testA test to which each individual transformer is subjected.

60044-3 ¤ IEC:2002– 15 –Special testA test other than a type or a routine test, agreed on by manufacturer and purchaser.6.2 Type testsThe following tests are type tests; for details, reference should be made to the relevantsubclauses: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 and8.3.2 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 transformersand 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 8.4of 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 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 otherwisespecified.After the transformer has been subjected to the dielectric type test of this subclause, it shall besubjected to all the routine tests of 6.3.6.3 Routine testsThe 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 ofIEC 60044-2 for voltage transformers);b) power-frequency withstand test on the primary winding (see 8.2 and see also 8.2 ofIEC 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 currenttransformers 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 currenttransformers 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).The order of the tests is not standardized but the determination of errors shall be performedafter each test.Repeated power-frequency tests on primary windings should be performed at 80 % of thespecified test voltage.

60044-3 ¤ IEC:2002– 17 –6.4 Special testsThe 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 forcurrent 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 ofIEC 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 (see 7.3and 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 tests7.1 GeneralFor the purposes of this part of IEC 60044, Clause 7 of IEC 60044-1 and Clause 8 ofIEC 60044-2 apply to the current and voltage transformer respectively, unless otherwisespecified below.7.2 Temperature-rise testA 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-statetemperature when the rate of temperature rise does not exceed 1 K/h. The ambienttemperature may be between 10 °C and 30 °C.When there is more than one secondary winding, the tests shall be made with the appropriaterated burden connected to each secondary winding unless otherwise agreed betweenmanufacturer and user. For the test, the transformer shall be mounted in a mannerrepresentative of the mounting in service. The prescribed current and voltage are appliedsimultaneously to the combined instrument transformer. For this purpose, it is necessary thatthe primary winding and the secondary winding of the transfor

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