1、BRITISH STANDARDBS EN 61557-3:2007Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures Part 3: Loop impedanceThe European Standard EN 61557-3:2007 has the status of a British StandardICS 17.220
2、.20; 29.080.01; 29.240.01BS EN 61557-3:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 June 2007 BSI 2007ISBN 978 0 580 50860 8National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61557-3:2007.
3、 It is identical with IEC 61557-3:2007. It supersedes BS EN 61557-3:1997, which will be withdrawn on 1 March 2010.The UK participation in its preparation was entrusted to Technical Committee PEL/85, Measuring equipment for electrical and electromagnetic quantities.A list of organizations represented
4、 on this committee can be obtained on request to its secretary.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 cannot confer immunity from legal obligations.Amendments issued
5、 since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61557-3 NORME EUROPENNE EUROPISCHE NORM March 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de
6、 Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61557-3:2007 E ICS 17.220.20; 29.080.01; 29.240.01 Supersedes EN 61557-3:1997English version Electrical safety in low voltage distribution system
7、s up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 3: Loop impedance (IEC 61557-3:2007) Scurit lectrique dans les rseaux de distribution basse tension de 1 000 V c.a. et 1 500 V c.c. - Dispositifs de contrle, de mesure ou de surveilla
8、nce de mesures de protection - Partie 3: Impdance de boucle (CEI 61557-3:2007) Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Gerte zum Prfen, Messen oder berwachen von Schutzmanahmen - Teil 3: Schleifenwiderstand (IEC 61557-3:2007) This European Standard was approve
9、d by CENELEC on 2007-03-01. 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 nationa
10、l 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 a
11、nd 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, L
12、ithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 61557-3:2007 2 Foreword The text of document 85/292/FDIS, future edition 2 of IEC 61557-3, prepared by IEC TC 85, Measuring equipment for electri
13、cal and electromagnetic quantities, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61557-3 on 2007-03-01. This European Standard supersedes EN 61557-3:1997. The following changes were made with respect to EN 61557-3:1997: definitions complemented; revision of some r
14、equirements; addition of information on operating instructions; addition of new influence quantities E9and E10. This standard is to be used in conjunction with EN 61557-1. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identic
15、al national standard or by endorsement (dop) 2007-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-03-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61557-3:2007 was approved by CENELEC a
16、s a European Standard without any modification. _ 3 EN 61557-3:2007 CONTENTS 1 Scope 4 2 Normative references .4 3 Terms and definitions .4 4 Requirements.5 5 Marking and operating instructions .7 5.1 Marking.7 5.2 Operating instructions .7 6 Tests8 Annex ZA (normative) Normative references to inter
17、national publications with their corresponding European publications .10 Bibliography .9 Table 1 Calculation of operating uncertainty.6 EN 61557-3:2007 4 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1 000 V a.c. AND 1 500 V d.c. EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTEC
18、TIVE MEASURES Part 3: Loop impedance 1 Scope This part of IEC 61557 specifies the requirements applicable to equipment for measuring the loop impedance between a phase conductor and the protective conductor or between a phase conductor and neutral or between two phase conductors by using the voltage
19、 drop when the circuit under test is loaded. 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 am
20、endments) applies. IEC 61010-1:2001, Safety requirements for electrical equipment for measurement, control, and laboratory use Part 1: General requirements IEC 61557-1, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monit
21、oring of protective measures Part 1: General requirements 3 Terms and definitions For the purposes of this document, the definitions given in IEC 61557-1 and the following definitions apply. 3.1 loading method method of loading a circuit within a distribution system to cause a voltage drop 3.2 loadi
22、ng equipment equipment causing a voltage drop in a circuit 3.3 test current current that causes a voltage drop in a circuit 5 EN 61557-3:2007 3.4 system phase angle angle between loop impedance and loop resistance of the distribution system 3.5 loop impedance Zssum of the impedances in a current loo
23、p comprising the impedance of the source of the current, the impedance of the phase conductor (e.g. protective conductor, earth electrode and earth) from the point of measurement to the other terminal of the source of the current 4 Requirements The following requirements as well as those given in IE
24、C 61557-1 shall apply. 4.1 The maximum percentage operating uncertainty within the measuring range to be marked or stated shall not exceed 30 % with the measured value as the fiducial value, as determined in accordance with Table 1. The operating uncertainty applies to the rated operating conditions
25、 in IEC 61557-1 and the following: circuit to be tested without load; system voltage between 85 % and 110 % of the nominal voltage of the distribution system for which the equipment has been designed; system frequency between 99 % and 101 % of the nominal frequency of the distribution system for whi
26、ch the equipment has been designed; system voltage and frequency kept constant during the measurement; circuit loaded by loading equipment. For measurements in close proximity to the transformer of the distribution system equipment with specified loop-impedance-measuring function (influence quantity
27、 for system phase angle at the minimum 30) shall be used or a specified additional operating uncertainty shall be taken in account by the user. NOTE In applications where the measurement of loop resistance is carried out in close proximity to the sourcing transformer (e.g. 50 V in accordance with Fi
28、gure 1 of IEC 61010-1 occur. 4.5 The measuring equipment shall not be damaged nor shall the user be exposed to danger when the measuring equipment is connected to 120 % of the nominal voltage of the distribution system for which the measuring equipment has been designed. Protective devices shall not
29、 be activated. 4.6 The user shall not be exposed to danger and the equipment shall not be damaged when the measuring equipment is accidentally connected to a voltage having a value of 173 % of its rated voltage to earth for 1 min. Protective devices may be activated. 5 Marking and operating instruct
30、ions 5.1 Marking In addition to the marking in accordance with IEC 61557-1, the following information shall be provided on the measuring equipment. 5.1.1 Range of the resistance of the loop impedance or of the calculated short-circuit current respectively within which compliance with the uncertainty
31、 limits in accordance with 4.1 is maintained. 5.1.2 Nominal system voltage for which the equipment has been rated. 5.1.3 Rated system frequency for which the equipment has been rated. 5.1.4 Phase angle of the loading equipment when this angle is 18. 5.2 Operating instructions The operating instructi
32、ons shall state the following in addition to the information given in IEC 61557-1. 5.2.1 Data relating to the loading equipment if the phase angle is 18. 5.2.2 Value and waveform of test current and duration of loading. 5.2.3 Range of system voltages within which the operating uncertainty stated in
33、4.1 is not exceeded. 5.2.4 Range of loop impedance (magnitude and angle) within which the operating uncertainty stated in 4.1 is not exceeded. 5.2.5 Note on possible uncertainties, for example due to preloading the circuit under test. 5.2.6 Data relating to the effect of system voltage variations an
34、d other effects from the system such as measuring in close proximity to the transformer of the distribution system. A specific user correction shall be stated, unless the instrument has a fully specified loop impedance measuring function. EN 61557-3:2007 8 6 Tests In addition to IEC 61557-1 the foll
35、owing tests shall be executed. 6.1 The operating uncertainty shall be calculated in accordance with Table 1. In this process, the intrinsic uncertainty shall be determined under the following reference conditions: nominal system voltage; nominal system frequency; reference temperature 23 C 2 C; refe
36、rence position in accordance with the manufacturers statement; nominal distribution system supply or battery voltage respectively; difference between phase angle of the loading equipment and the loop impedance of the circuit under test 5. The operating uncertainty thus evaluated shall not exceed the
37、 limits specified in 4.1. 6.2 Compliance with the requirements in accordance with 4.3 shall be tested (type test). 6.3 Compliance with the requirements in accordance with 4.4 shall be tested (routine test). 6.4 The permissible overload in accordance with the requirements of 4.5 and 4.6 shall be test
38、ed (type test). 6.5 Compliance with the tests in this clause shall be recorded. 9 EN 61557-3:2007 Bibliography IEC 61800-5-2, Adjustable speed electrical power drive systems Part 5-2: Safety requirements Functional 1) 1) To be published.EN 61557-3:2007 10 Annex ZA (normative) Normative references to
39、 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. For undated references, the latest edition of the referenced document (including
40、 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 YearIEC 61010-1 2001 Safety requirements for electrical equipment for measurement, control, and laboratory use - Pa
41、rt 1: General requirements EN 61010-1 + corr. June 2001 2002 IEC 61557-1 -1)Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 1: General requirements EN 61557-1 20072)1)Undated refe
42、rence. 2)Valid edition at date of issue. blankBS EN 61557-3:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is
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