1、BRITISH STANDARD BS89-8:1990 EN60051-8: 1989 IEC51-8:1984 Direct acting indicating analogue electrical measuring instruments and their accessories Part 8: Specification for special requirements for accessories This European Standard EN60051-8has the status of a British Standard UDC: 621.317.799.037.
2、33BS89-8:1990 This British Standard was published under the authorityofthe Board of BSI andcomes intoeffect on 31August1990 BSI08-1999 First published as BS89 October1919 Second edition August1926 Third edition September1937 Fourth edition February1954 Fifth edition March1977 Published as BS89-8 Aug
3、ust1990 The following BSI references relate to the work on this standard: Committee referencePEL/13 Draft for comment88/33513DC ISBN 0 580 18469 2 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepa
4、red, comprises the National Committees of the following countries. Austria Italy Belgium Luxemburg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland UnitedKingdom Amendments issued since publication Amd. No. Date of issue CommentsBS89-8:1990 B
5、SI 08-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief history 2 Foreword 2 Text of EN 60051-8 5 National appendix W Inside back coverBS89-8:1990 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Power Elec
6、trical Engineering Standards Policy Committee and is the English language version of EN60051-8 “Direct acting indicating analogue electrical measuring instruments and their accessories Part8: Special requirements for accessories”, published by the European Committee for Electrotechnical Standardizat
7、ion (CENELEC). It is identical with IEC publication51-8published by the International Electrotechnical Commission (IEC). This Part of BS89 together with Parts1, 2,3, 4,5,6,7 and9 of this standard supersedes BS89:1977, which is withdrawn. BS89comprises the following Parts, which will be the English l
8、anguage version of the listed EuropeanStandards. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal oblig
9、ations. European Standard Corresponding Part of BS89 EN60051-1 Part1 Specification for definitions and general requirements common to all Parts EN60051-2 Part2 Specification for special requirements for ammeters and voltmeters EN60051-3 Part3 Specification for special requirements for wattmeters and
10、 varmeters EN60051-4 Part4 Specification for special requirements for frequency meters EN60051-5 Part5 Specification for special requirements for phase meters, power faction meters and synchroscopes EN60051-6 Part6 Specification for special requirements for ohmmeters (impedance meters) and conductan
11、ce meters EN60051-7 Part7 Specifications for special requirements for multi-function instruments EN60051-8 Part8 Specification for special requirements for accessories EN60051-9 Part9 Recommended test methods Summary of pages This document comprises a front cover, an inside front cover, pagesi andii
12、, theEN title page, pages2to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60051-8 Nove
13、mber1989 UDC: 621.317.799.037.33 Key words: Electrical measuring instruments; analogue indicating instruments; direct acting measuring instruments; accessories for electrical measuring instruments English version Direct acting indicating analogue electrical measuringinstruments and their accessories
14、 Part8:Specialrequirements for accessories (IEC51-8(1984)edition4) Appareils mesureurs lectriques indicateurs analogiques action directe et leurs accessoires Huitime partie: Prescriptions particulires pour les accessoires (CEI51-8(1984)dition4) Direkt wirkende anzeigende elektrische Megerte und ihr
15、Zubehr Megerte mit Skalenanzeige Teil 8: Spezielle Anforderungen fr Zebehr (IEC51-8(1984) Ausgabe4) This European Standard was ratified by CENELEC on11September1989. CENELEC members are bound to comply with the requirements of the CENELEC Internal Regulations which stipulate the conditions for givin
16、g 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 CENELEC Central Secretariat or to any CENELEC member. This European Standard exists in three off
17、icial versions (English, French and German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to CENELEC Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechni
18、cal committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechni
19、que Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels CENELEC1989Copyright reserved to all CENELEC members Ref. No. EN60051-8:1989 EEN60051-8:1989 BSI 08-1999 2 Brief history The text of IEC-Publication51-8 (4th edition 1984) was submitted to t
20、he CENELEC members for unique acceptance. Technical text The text of the International Standard IEC51-8 (4th edition 1984) was approved by CENELEC on11 September1989 as a European Standard. The following dates are applicable: Foreword 1) The formal decisions or agreements of the IEC on technical mat
21、ters, prepared by Technical Committees on which all the National Committees having a special interest therein are represented, express, as nearly as possible, an international consensus of opinion on the subjects dealt with. 2) They have the form of recommendations for international use and they are
22、 accepted by the National Committees in that sense. 3) In order to promote international unification, the IEC expresses the wish that all National Committees should adopt the text of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence between
23、the IEC recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter. Preface This standard has been prepared by IEC Technical Committee No.85: Measuring Equipment for Basic Electrical Quantities (formerSub-Committee13B:Electrical Measuring Instr
24、uments). This fourth edition replaces the third edition of IECPublication51. This standard constitutes Part8. The general layout for the revised Publication51 is as follows: Part 1: Definitions and General Requirements Common to all Parts; Part 2: Special Requirements for Ammeters and Voltmeters; Pa
25、rt 3: Special Requirements for Wattmeters and Varmeters; Part 4: Special Requirements for Frequency Meters; Part 5: Special Requirements for Phase Meters, Power Factor Meters and Synchroscopes; Part 6: Special Requirements for Ohmmeters (Impedance Meters) and Conductance Meters; Part 7: Special Requ
26、irements for Multi-function Instruments; Part 8: Special Requirements for Accessories; Part 9: Recommended Test Methods. Parts2 to9 are not complete in themselves and shall be read in conjunction with Part1. All of these parts are arranged in the same format and a standard relationship between subje
27、ct and clause number is maintained throughout. In addition, tables, figures and appendices add a suffix to the part number in order to differentiate the parts. This re-arrangement will assist the reader of IEC Publication51 to distinguish information relating to the different types of instruments. T
28、he text of this standard is based upon the following documents: Further information can be found in the Report on Voting indicated in the table above. latest date of announcement of the EN atnational level (doa): 1990-03-01 date of latest publication ofa new harmonized standard (dop): 1990-09-01 dat
29、e of withdrawal of conflicting national standards (dow): 1990-09-01 Six Months Rule Report on Voting 13B(CO)91 13B(CO)100EN60051-8:1989 BSI 08-1999 3 Contents Page Brief history 2 Foreword 2 1 Scope 5 2 Definitions 5 3 Description, classification and compliance 5 4 Reference conditions and intrinsic
30、 errors 5 5 Nominal range of use and variations 6 6 Further electrical and mechanical requirements 6 7 Constructional requirements 7 8 Information, general markings and symbols 7 9 Markings and symbols for terminals 7 10 Tests to prove compliance with this standard 7 Table II-8 Limits of the nominal
31、 range of use and permissible variations additional to those given in Table II-1 6 Table IV-8 Overloads of short duration 74 blankEN60051-8:1989 BSI 08-1999 5 1 Scope 1.1 This sub-clause of Part1 does not apply to accessories. 1.2 Part8 of the standard applies to accessories as defined in Sub-clause
32、 2.1.15 of Part1. 1.3 This sub-clause of Part1 does not apply to accessories. 1.4 to 1.8 See Part1. 2 Definitions See Part1. 3 Description, classification and compliance 3.1 Description Accessories shall be described: 3.1.1 According to their nature as: 3.1.1.1 Shunts as defined in Sub-clause 2.1.16
33、 of Part1. 3.1.1.2 Series resistors (impedances) as defined in Sub-clause 2.1.17 of Part1. 3.1.1.3 Special-to-type accessories, for example reactor boxes for frequency meters. 3.1.2 According to their interchangeability as: 3.1.2.1 Interchangeable accessories as defined in Sub-clause 2.1.15.1 of Par
34、t1. 3.1.2.2 Accessories of limited interchangeability as defined in Sub-clause 2.1.15.2 of Part1. 3.1.2.3 Non-interchangeable accessories as defined in Sub-clause 2.1.15.3 of Part1. 3.2 Classification 3.2.1 Interchangeable accessories and accessories of limited interchangeability shall be classified
35、 in one of the accuracy classes denoted by the following class indices: NOTEThe class indices marked with an asterisk (*) are only for use with high-voltage series resistors and impedances. 3.2.2 A non-interchangeable accessory has no accuracy class of its own: the accuracy class of the associated i
36、nstrument applies to the combination of the instrument and accessory. 3.3 Compliance with the requirements of this standard See Part1. 3.3.1 and 3.3.2 See Part1. 3.3.3 Interchangeable accessories and accessories of limited interchangeability 3.3.3.1 The error shall not exceed the amount specified by
37、 Sub-clause4.2 at all values of the measured quantity up to and including the rated value. 3.3.3.2 Shunts and series resistors shall be tested using direct current unless a frequency is stated. 3.3.3.3 Interchangeable shunts When the current taken by the associated measuring instrument is smaller th
38、an the rated current multiplied by the class index of the shunt and divided by300, the current taken by the associated measuring instrument may be neglected. 3.3.4 Accessories of limited interchangeability 3.3.4.1 The accessory is connected to an instrument of the associated type and the errors of t
39、he combination are determined. 3.3.4.2 The instrument alone is tested under the same conditions as used in the test of Sub-clause3.3.4.1 and its errors are determined for the same indicated values that were obtained in that test. 3.3.4.3 The error of the accessory for each pair of indicated values i
40、s taken to be the difference obtained by subtracting the error determined in Sub-clause3.3.4.2 from the error determined in Sub-clause3.3.4.1, taking account of the signs of the errors (see Part1, Sub-clause 2.7.1). 3.3.4.4 Instruments intended to be used with accessories of limited interchangeabili
41、ty may necessitate special values of certain circuit elements. Where this is necessary, the relevant information shall be given by the manufacturer and shall be complied with when carrying out the tests. 3.3.4.5 When an instrument cannot be tested without an accessory, the accuracy class applies to
42、the combination only and the class index is marked on the instrument. The errors are determined in accordance with Sub-clause3.3.4.1. 3.3.5 Non-interchangeable accessories The accessory is tested in combination with its own instrument. There are no requirements relating to limits of error for either
43、 component alone and the class index relates to the combination. 4 Reference conditions and intrinsic errors 4.1 Reference conditions See Part1. 0.02, 0.05, 0.1, 0.2, 0.3, 0.5, 1, 2*, 5*, 10*,EN60051-8:1989 6 BSI 08-1999 4.2 Limits of intrinsic error, fiducial value See Part1. 4.2.1 Correspondence b
44、etween intrinsic error and accuracy class See Part1. 4.2.2 Fiducial value The fiducial value for an interchangeable accessory or an accessory of limited interchangeability corresponds to the rated value. The class index is marked using Symbol E-1 given in Table III-1 (see Part1, Clause 8). 5 Nominal
45、 range of use and variations 5.1 Nominal range of use See Part1 and Table II-8. 5.2 Limits of variations See Part1. 5.2.1 and 5.2.2 See Part1. These sub-clauses apply when relevant (e.g.to reactor boxes). 5.2.3 This sub-clause of Part1 does not apply to accessories. 5.2.4 See Part1. However, this su
46、b-clause does not apply to an accessory which is intended to be supported by its associated wiring or supported by a bus bar. 5.3 Conditions for the determination of variations See Part1. 6 Further electrical and mechanical requirements 6.1 Voltage tests, insulation tests and other safety requiremen
47、ts See Part1. 6.2 Damping The requirements of Part1 do not apply to accessories. 6.3 Self-heating See Part1. 6.4 Permissible overloads 6.4.1 Continuous overload For the recommended test, see Part9, Sub-clause 4.7. Accessories, except those provided with a non-locking switch, shall be subjected to a
48、continuous overload of120% of the rated value for a period of2h. After having cooled to the reference temperature, the accessory shall comply with the requirements relating to its accuracy class. This test shall be carried out under reference conditions. 6.4.2 Overloads of short duration For the rec
49、ommended tests, see Part9, Sub-clause 4.5. Accessories, except those provided with a non-locking switch, shall be subjected to overloads of short duration. 6.4.2.1 The currents and voltages for the overloads of short duration shall be the product of the relevant factor given in Table IV-8 and the rated value of the shunt or the series resistor (impedance), unless other values are stated by the manufacturer. 6.4.2.2 The full duration of each overload shall be applied except when an automatic cut-out (fuse) fitted to the acces
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