1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g581 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures
2、 Part 4: Resistance of earth connection and equipotential bondingThe European Standard EN 61557-4:2007 has the status of a British StandardICS 17.220.20; 29.080.01; 29.240.01Electrical safety in low voltage distribution systems up to BRITISH STANDARDBS EN 61557-4:2007BS EN 61557-4:2007This British S
3、tandard was published under the authority of the Standards Policy and Strategy Committee on 29 June 2007 BSI 2007ISBN 978 0 580 50859 2Amendments issued since publicationAmd. No. Date CommentsThis publication does not purport to include all the necessary provisions of a contract. Users are responsib
4、le for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61557-4:2007. It is identical with IEC 61557-4:2007. It supersedes BS EN 61557-4:1997, which
5、will be withdrawn on 1 March 2010.The UK participation in its preparation was entrusted to Technical Committee PEL/85, Measuring equipment for electrical and electromagnetic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 on this committee can be obtained on request to its secretary.EUROPEAN STANDARD
6、 EN 61557-4 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 Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights
7、 of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61557-4:2007 E ICS 17.220.20; 29.080.01; 29.240.01 Supersedes EN 61557-4:1997English version Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for tes
8、ting, measuring or monitoring of protective measures - Part 4: Resistance of earth connection and equipotential bonding (IEC 61557-4:2007) 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 surveillance de mesures
9、de protection - Partie 4: Rsistance de conducteurs de terre et dquipotentialit (CEI 61557-4:2007) Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Gerte zum Prfen, Messen oder berwachen von Schutzmanahmen - Teil 4: Widerstand von Erdungsleitern, Schutzleitern und Poten
10、tialausgleichsleitern (IEC 61557-4:2007) This European Standard was approved 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 alterati
11、on. 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 trans
12、lation 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, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Fi
13、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 85/293/FDIS, future edition 2 of IEC 61557-
14、4, prepared by IEC TC 85, Measuring equipment for electrical and electromagnetic quantities, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61557-4 on 2007-03-01. This European Standard supersedes EN 61557-4:1997. This standard is to be used in conjunction with EN 6
15、1557-1. 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) 2007-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-03-01 An
16、nex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61557-4:2007 was approved by CENELEC as a European Standard without any modification. _ EN 61557-4:2007 2 CONTENTS 1 Scope.4 2 Normative references4 3 Terms and definitions .4 4 Requirements .4 5 Markin
17、g and operating instructions6 5.1 Marking .6 5.2 Operating instructions6 6 Tests 6 Table 1 Calculation of operating uncertainty .5 Annex ZA (normative) Normative references to international publications with theircorresponding European publications 8 EN 61557-4:2007 3 ELECTRICAL SAFETY IN LOW VOLTAG
18、E 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 4: Resistance of earth connection and equipotential bonding 1 Scope This part of IEC 61557 specifies the requirements applicable to equipment for measuring the resist
19、ance of earth conductors, protective earth conductors and conductors for equipotential bonding, including their connections and terminals, with an indication of the measured value or indication of limits. 2 Normative references The following referenced documents are indispensable for the application
20、 of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 test
21、ing, measuring or monitoring of protective measures Part 1: General requirements 3 Terms and definitions For the purposes of this document, the definitions given in IEC 61557-1 apply. 4 Requirements The following requirements as well as those given in IEC 61557-1 shall apply. 4.1 The measuring volta
22、ge may be a d.c. or an a.c. voltage. The open-circuit voltage shall not exceed 24 V and shall not be less than 4 V. 4.2 The measuring current within the minimum measuring range according to 4.4 shall not be less than 0,2 A. 4.3 Resistance measuring equipment using a d.c. voltage as a measuring volta
23、ge shall be provided either with a reversing switch or allow the interchanging of test leads. 4.4 The measuring range within which the operating uncertainty in accordance with 4.6 is maintained, shall include the values 0,2 to 2 . The range shall be marked on the equipment. With analogue only presen
24、tation of the measuring results, the range shall be marked on the scale. EN 61557-4:2007 4 4.5 The range to be marked in accordance with 4.4 on analogue measuring equipment shall cover at least 50 % of the length of the scale. The division on the scale within this range shall be at least 0,5 mm per
25、0,1 . The resolution for digital equipment shall be at least 0,1 . 4.6 The maximum percentage operating uncertainty within the measuring range to be marked or stated shall not exceed 30 %, with the measured value as fiducial value determined in accordance with Table 1. The operating uncertainty appl
26、ies under the rated operating conditions given in IEC 61557-1. 4.7 When external resistances are included in the calibration as a zero offset, then this shall be indicated. This offset shall remain included as long as it is indicated regardless of any changes in range or function. 4.8 Equipment prov
27、ided only with an indication of limits shall unambiguously display if either the upper or lower limit is reached. 4.9 The user shall not be exposed to danger and the equipment shall not be damaged when the measuring equipment is accidentally connected with 120 % of the nominal voltage of the distrib
28、ution system on which the measuring equipment may be used. Protective devices may be activated. Table 1 Calculation of operating uncertainty Intrinsic uncertainty or influence quantity Reference conditions or specified operating range Designationcode Requirements or test in accordance with relevant
29、parts of IEC 61557 Type of test Intrinsic uncertainty Reference conditions A Part 4, subclause 6.1 R Position Reference position 90 E1Part 1, subclause 4.2 R Supply voltage At the limits stated by the manufacturer E2Part 1, subclauses 4.2, 4.3 R Temperature 0 C and 35 C E3Part 1, subclause 4.2 T Ope
30、rating uncertainty )1,15( 232221EEEAB +=Part 4, subclause 4.6 R A = intrinsic uncertainty En= variations R = routine test T = type test B = B%fiducial value100 % EN 61557-4:2007 5 5 Marking and operating instructions 5.1 Marking In addition to the marking in accordance with IEC 61557-1, the followin
31、g information shall be provided on the measuring equipment. 5.1.1 Open-circuit voltage. 5.1.2 Measuring current. 5.1.3 The nominal system voltages for which the equipment has been rated. 5.1.4 The measuring range in accordance with 4.6. 5.2 Operating instructions The operating instructions shall sta
32、te the following information in addition to the statements specified in IEC 61557-1. 5.2.1 A warning indicating that measurements shall only be carried out on de-energized circuits. 5.2.2 A warning indicating that the results of measurements can be adversely affected by impedances of additional oper
33、ating circuits connected in parallel or by transient currents. 5.2.3 A statement on the correct operation when power is supplied by a hand-driven generator. 5.2.4 For measuring equipment with a supply from batteries/rechargeable cells the possible number of measurements shall be stated. 6 Tests In a
34、ddition to IEC 61557-1 the following tests shall be executed. 6.1 The operating uncertainty shall be determined in accordance with Table 1. In this process, the intrinsic uncertainties shall be determined under the following reference conditions: nominal value of the supply voltage; nominal r.p.m. o
35、f the hand-driven generator when used as a supply; reference temperature 23 C 2 C; reference position in accordance with the manufacturers statement. The operating uncertainty thus evaluated shall not exceed the limits specified in 4.6. 6.2 The lower value of open-circuit voltage shall be measured a
36、nd compliance with the requirements under 4.1 shall be tested (routine test). The upper value of open-circuit voltage shall be measured and compliance with the requirements under 4.1 shall be tested (type test). 6.3 The measuring current shall be measured and compliance with the requirement under 4.
37、2 shall be tested (routine test). 6.4 Compliance with the requirements under 4.7 shall be tested (type test). EN 61557-4:2007 6 6.5 The permissible overload in accordance with 4.9 shall be tested. For this purpose, a d.c. voltage with sequential polarity change and an a.c. voltage of 1,2 times the m
38、agnitude of the nominal voltage of the distribution system shall be applied in turns for a duration of 10 s to the measurement terminals. The test shall be performed with the measuring equipment switched on and off. After this, the measuring equipment shall not be damaged (type test). 6.6 The possib
39、le number of measurements until the limit of the voltage range specified by the battery check facility is reached, shall be determined. In this process, the measuring equipment shall be loaded with a test resistance of (1 5 m) for 5 s with intervals of 25 s between each new loading (type test). 6.7
40、Compliance with the tests in this clause shall be recorded. _ EN 61557-4:2007 7 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
41、references, only the edition cited applies. For 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 Tit
42、le EN/HD Year 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 reference. 2)Valid edition at date of issue. EN 615
43、57-4:2007 8 blankBS EN BSI389 Chiswick High RoadLondonW4 4AL61557-4:2007BSI 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 incorporated by Royal Charte
44、r.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy o
45、r ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400.BSI offers members an individual updating service called PLUS which ensure
46、s that subscribers automatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available
47、 from the BSI website at http:/www.bsi-.In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national
48、, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 70
49、48. Email: infobsi-.Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-.Information regarding online access to British Standards via British Standards Onl
