1、BRITISH STANDARDBS EN 61557-2:2007Electrical 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 2: Insulation resistanceThe European Standard EN 61557-2:2007 has the status of a British StandardICS
2、 17.220.20; 29.080.01; 29.240.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61557-2:2007This British Standard was published under the auth
3、ority of the Standards Policy and Strategy Committee on 29 June 2007 BSI 2007ISBN 978 0 580 50861 5National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61557-2:2007. It is identical with IEC 61557-2:2007. It supersedes BS EN 61557-2:1997, which will be withd
4、rawn 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.This publication does not pur
5、port 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 since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61557-2 NORME EUROPENNE EUROPIS
6、CHE 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 of exploitation in any form and by
7、 any means reserved worldwide for CENELEC members. Ref. No. EN 61557-2:2007 E ICS 17.220.20; 29.080.01; 29.240.01 Supersedes EN 61557-2:1997English version 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 pr
8、otective measures - Part 2: Insulation resistance (IEC 61557-2:2007) 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 de protection - Partie 2: Rsistance disolement (CEI 61557-2:2007) Ele
9、ktrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Gerte zum Prfen, Messen oder berwachen von Schutzmanahmen - Teil 2: Isolationswiderstand (IEC 61557-2:2007) This European Standard was approved by CENELEC on 2007-03-01. CENELEC members are bound to comply with the CEN/CENE
10、LEC 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 C
11、ENELEC 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 versio
12、ns. 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, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania,
13、Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 85/291/FDIS, future edition 2 of IEC 61557-2, prepared by IEC TC 85, Measuring equipment for electrical and electromagnetic quantities, was submitted to the IEC-CENELEC parallel vote and was approved
14、 by CENELEC as EN 61557-2 on 2007-03-01. This European Standard supersedes EN 61557-2:1997. The following changes were made with respect to EN 61557-2:1997: definitions complemented; revision of some requirements; addition of a warning pictogram; complete revision of the subclause on overload tests.
15、 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 identical national standard or by endorsement (dop) 2007-12-01 latest date by which the national standards conflicting
16、 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 61557-2:2007 was approved by CENELEC as a European Standard without any modification. _ EN 61557-2:2007 2 CONTENTS 1 Scope.4 2 Normative references4
17、3 Terms and definitions .4 4 Requirements .4 5 Marking and operating instructions6 5.1 Marking .6 5.2 Operating instructions6 6 Tests 6Annex ZA (normative) Normative references to international publications with theircorresponding European publications.9 Table 1 Calculation of operating uncertainty
18、.5EN 61557-2:2007 3 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 2: Insulation resistance 1 Scope This part of IEC 61557 specifies the requirements applicable to equipment for meas
19、uring the insulation resistance of equipment and installations in the de-energized state. 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
20、 of the referenced document (including any amendments) 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
21、.c. Equipment for testing, 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 and the following definitions apply. 3.1 rated output voltage UNvoltage output across the measuring e
22、quipment terminals when this equipment is loaded with the rated current 4 Requirements The following requirements as well as those given in IEC 61557-1 shall apply. 4.1 The output voltage shall be a d.c. voltage; the indication at the rated output voltage across a resistor of a value of UN (1 000 /V
23、) shall not differ by more than 10 % relative to the indicated value, as a result of possibly present a.c. voltage components in the output voltage, when a capacitor of 2 F is connected in parallel with the insulation resistance to be measured. 4.2 The open-circuit voltage shall not exceed 1,25 time
24、s the rated output voltage. 4.3 The rated current shall be at least 1 mA. EN 61557-2:2007 4 4.4 The measuring current shall not exceed 15 mA peak. Any a.c. component present shall not exceed 1,5 mA peak. 4.5 The maximum percentage operating uncertainty within the measurement range to be marked or st
25、ated shall not exceed 30 % with the measured value as fiducial value, as determined in accordance with Table 1. The operating uncertainty shall apply under the rated operating conditions in accordance with IEC 61557-1. Table 1 Calculation of operating uncertainty Intrinsic uncertainty or influence q
26、uantity Reference conditions or specified operating range Designationcode Requirements or tests in accordance with relevant parts of IEC 61557 Type of test Intrinsic uncertainty Reference conditions A Part 2, subclause 6.1 R Position Reference position 90 E1Part 1, subclause 4.2 R Supply voltage At
27、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 Operating uncertainty )151( 232221EEEAB += ,Part 2, subclause 4.5 R A = intrinsic uncertainty En= variations R = routine test T = type test B % = Bfiducial value100 % 4.6 The user
28、 shall not be subjected to danger, when extraneous d.c. or a.c. voltages up to 120 % of the highest rated ouput voltage are accidentally applied for a duration of 10 s to the measurement terminals of the measuring equipment. 4.6.1 When the measuring equipment bears one of the following markings, the
29、 applied extraneous a.c. overvoltage can be reduced to a voltage of 1,1 times the phase to phase voltage: a) DO NOT USE IN DISTRIBUTION SYSTEMS WITH VOLTAGES HIGHER THAN . V. The marking shall be written in the corresponding country language. The value of the voltage shown on the marking shall be 1,
30、1 times the maximum phase to phase voltage. or EN 61557-2:2007 5 b) Example of pictogram for a 500 V a.c. system The pictogram and outline shall contrast with the background. The value of the voltage shown on the marking shall be 1,1 times the maximum phase to phase voltage. After applying this redu
31、ced a.c. overvoltage, the equipment shall stay within the specification. 5 Marking and operating instructions 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 Rated output voltage. 5.1.2 Rated current
32、. 5.1.3 Measurement range in accordance with 4.5. 5.2 Operating instructions The operating instructions shall state the following information in addition to the statements specified in IEC 61557-1. 5.2.1 A warning stating that measurements shall be carried out only on parts of an installation or equ
33、ipment that are de-energized. 5.2.2 A statement on the correct operation when power is supplied by a hand-driven generator. 5.2.3 In accordance with 6.7, the possible number of measurements shall be stated for measuring equipment with power supplied by batteries/accumulators. 6 Tests In addition to
34、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. when power i
35、s supplied by a hand-driven generator; reference temperature 23 C 2 C; reference position in accordance with the manufacturers statement. EN 61557-2:2007 6 The operating uncertainty thus evaluated shall not exceed the limits specified in 4.5. 6.2 The open-circuit voltage shall be checked for complia
36、nce with the specification in 4.2 (routine test). 6.3 The rated current shall be tested through a test resistor of a value of UN (1 000 /V). Compliance with the requirements in 4.3 shall be checked (routine test). 6.4 The measuring current shall be tested and compliance with the requirements in 4.4
37、shall be checked (routine test). NOTE When an a.c. voltage is superimposed on the d.c., then measuring equipment for measuring the peak value of the current must be used. 6.5 Tests shall establish that the indication is stable and does not change by more than 10 % when a capacitor of 2 F 10% is conn
38、ected in parallel. In this condition, the measuring equipment is loaded by a resistor free from capacitance and inductance in such a manner that the rated output voltage and rated current will occur (type test). 6.6 Overload tests 6.6.1 Overload test with a.c. voltage The permissible overload in acc
39、ordance with 4.6 or 4.6.1 shall be tested. For this purpose an a.c. voltage according to 4.6. or 4.6.1 shall be applied for a duration of 10 s whilst the equipment is switched on and off. The a.c. test source shall have the capability to activate protective devices and to indicate weak points of cir
40、cuitry. If protective devices are activated or parts are damaged, the test shall be repeated with a test source having a capability according to 16.2 of IEC 61010-1:2001. After test with a.c. overvoltage according to 4.6, defects, if any, shall be clearly indicated, indications and displayed values
41、shall not lead to unsafe interpretations. After tests with a.c. overvoltages according to 4.6.1. the equipment shall stay within the specification. This includes reactivation of protective devices by the user without any repair. NOTE The replacement of fuses accessible to the user should be consider
42、ed as reactivation of a protective device. 6.6.2 Overload tests with d.c. voltage In addition a .d.c. voltage of 1.2 times the magnitude of the highest rated output voltage stored on a capacitor of 2 F shall be applied in both polarities whilst the equipment is switched on and off. After this the me
43、asuring equipment shall stay within the specification, without activation of protective devices. 6.7 The number of measurements that it is possible to make, until the limit of the voltage range determined by the battery check facility is reached, shall be determined. EN 61557-2:2007 7 In this proces
44、s, the measuring equipment shall be loaded with a test resistance of UN (1 000 /V) alternating between 5 s loading and intervals of about 25 s prior to each new loading (type test). 6.8 Compliance with the tests in this clause shall be recorded. _ EN 61557-2:2007 8 Annex ZA (normative) Normative ref
45、erences to 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
46、(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 Title EN/HD Year IEC 61010-1 2001 Safety requirements for electrical equipment for measurement, control, and laborato
47、ry use - Part 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)U
48、ndated reference. 2)Valid edition at date of issue. EN 61557-2:2007 9 BS EN 61557-2:2007BSI389 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 in
49、ternational level. It is incorporated by Royal Charter.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 or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible,
