1、BRITISH STANDARD BS EN 61270-1:1998 IEC 61270-1: 1996 Capacitors for microwave ovens Part 1: General The European Standard EN 61270-1:1996 has the status of a British Standard ICS 31.060.01; 97.040.20BSEN61270-1:1998 This British Standard, having been prepared under the directionof the Electrotechni
2、cal Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 May 1998 BSI 05-1999 ISBN 0 580 29825 6 National foreword This British Standard is the English language version of EN 61270-1:1996. It is identical with IEC61270-1:1996. The UK participation in its p
3、reparation was entrusted to Technical Committee PEL/33, Power capacitors, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informe
4、d; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From1January 1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has
5、 been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative r
6、eferences to international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspond
7、ence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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
8、itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorp
9、orated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN61270-1:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61270-1 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPI
10、SCHE NORM EN 61270-1 November 1996 ICS 31.060.00; 97.040.20 Descriptors: Power capacitors, microwave ovens, definitions, use conditions, safety, construction characteristics, creepage distances, clearance distances, tests, voltage tests, mechanical tests, climatic tests, capacitance measurement, tes
11、ting conditions, marking English version Capacitors for microwave ovens Part 1: General (IEC 1270-1:1996) Condensateurs pour les fours micro-ondes Partie 1: Gnralits (CEI 1270-1:1996) Kondensatoren fr Mikrowellenkochgerte Teil 1: Allgemeines (IEC 1270-1:1996) This European Standard was approved by C
12、ENELEC on 1996-10-01. 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 stan
13、dards 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 not
14、ified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland a
15、nd United Kingdom. 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 1996 Copyright reserved to CENELEC members Ref. No. EN 61270-1:
16、1996 EEN61270-1:1996 2 BSI 05-1999 Foreword The text of document 33/228/FDIS, future edition 1 of IEC 1270-1, prepared by IEC TC 33, Power capacitors, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61270-1 on 1996-10-01. The following dates were fixed: For products w
17、hich have complied with the relevant national standard before1997-07-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 2002-07-01. Annexes designated “normative” are part of the body of the standard. Annexes designated “inf
18、ormative” are given for information only. In this standard, Annex ZA is normative and Annex A is informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC1270-1:1996 was approved by CENELEC as a European Standard without any modification. In the o
19、fficial version, in clause A.4, the following notes have to be added after the reference to IEC309-1: NOTE 1IEC 309-1:1988 + corrigendum March 1992 is harmonized as EN 60309-1:1992 (modified). NOTE 2IEC 695-2-1/0 to 1/3:1994 are being harmonized by CENELEC. Contents Page Foreword 2 1 General 3 1.1 S
20、cope and object 3 1.2 Normative references 3 2 Definitions 3 3 Service conditions 4 3.1 Altitude 4 Page 3.2 Pollution 4 3.3 Operating temperature 5 3.4 Damp heat severity 5 4 Safety and construction 5 4.1 Safety 5 4.2 Terminations 5 4.3 Creepage distances and clearances 5 4.4 Temperature dependance
21、of the capacitance 6 4.5 Capacitance tolerance 7 4.6 Voltage 7 4.7 Load capacity 7 4.8 Marking 7 5 Tests 7 5.1 General 7 5.2 Test conditions 7 5.3 Nature of tests 8 5.4 Type tests 8 5.5 Routine tests 9 5.6 Visual examination 9 5.7 Capacitance measurement 10 5.8 Voltage tests 10 5.9 Voltage test betw
22、een the terminals 10 5.10 Voltage test between terminals and case 11 5.11 Voltage test between capacitor elements 11 5.12 Test of internal discharge device 11 5.13 Endurance test 11 5.14 Mechanical and climatic tests 12 6 Environmental protection 12 Annex A (informative) Information on tests on comp
23、onents made of insulating material (i.e.insulators) Inside back cover Annex ZA (normative) Normative references to international publications with their corresponding European publications Inside back cover Figure 1Electric circuit for d.c. voltage test 10 Table 1 Minimum creepage distances and clea
24、rances 6 Table 2Surface distances as a function of insulating materials 6 Table 3 Maximum capacitance deviations atthetemperature limits 6 Table 4 Type tests schedule 9 Table 5 Test voltages and durations 11 Table 6 Test group 1: mechanical and climatictests 13 Table 7 Test group 2:climatic tests 14
25、 latest date by which the ENhas to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1997-07-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow)1997-07-01EN61270-1:1996 BSI 05-1999 3 1 General 1.1 Sc
26、ope and object This part of IEC1270 applies to capacitors for microwave ovens operating at rated a.c. voltages of upto3000V and a superimposed d.c. voltage of up totimes the value of rated a.c. voltage. This standard relates specifically to capacitors with a metal case and an upper rated maximum tem
27、perature of upto100C, non-self-healing, with metal foil electrodes and dielectrics of paper and/or plastic, impregnated with a suitable oil. The object of this standard is: a) to formulate uniform rules regarding performance, testing and rating; b) to formulate specific safety rules. 1.2 Normative r
28、eferences The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC1270. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this
29、 part of IEC1270 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 68-1:1988, Environmental testing Part1:General and guidance. IEC 6
30、8-2, Environmental testing Part2:Tests. IEC 68-2-1:1990, Environmental testing Part2:Tests Tests A: Cold. IEC 68-2-3:1969, Environmental testing Part2:Tests Test Ca: Damp heat, steady state. IEC 68-2-14:1984, Environmental testing Part2:Tests Test N: Change of temperature. IEC 68-2-20:1979, Environm
31、ental testing Part2:Tests Test T: Soldering. IEC 68-2-21:1983, Environmental testing Part2:Tests Test U: Robustness of terminations and integral mounting devices. IEC 112:1979, Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions.
32、 IEC 335-2-25:1993, Safety of household and similar electric appliances Part2:Particular requirements for microwave ovens. 2 Definitions For the purposes of this part of IEC1270, the following definitions apply. 2.1 capacitor for microwave ovens power capacitor which is connected in the main power s
33、upply circuit of the magnetron of a microwave oven operated from a50Hz or60Hz power line, the capacitor being a component of the circuit for stabilizing the magnetron current 2.2 capacitor element device which consists of two electrodes separated by a dielectric. The capacitor is constructed by asse
34、mbling together one or more capacitor elements inside the same case and connecting the electrodes to external terminals 2.3 rated voltage (U N ) the r.m.s. value of the alternating voltage for which the capacitor has been designed. A superimposed d.c. voltage of up totimes the value of the rated a.c
35、. voltage is permitted. 0,8. 2 0,8. 2EN61270-1:1996 4 BSI 05-1999 2.4 highest rated voltage (U m ) highest r.m.s. value of the alternating voltage(s) at which the capacitor has been designed to operate: it can be of interest particularly when two or more capacitors are structurally combined together
36、 inside the same case. Then U m is the highest rated voltage of the combined capacitors U mis used as the reference for measuring the insulation between the terminals and the case unless otherwise specified, U m = U N , but in any case U m $ U N . Any difference between the highest rated voltage (U
37、m ) and the rated voltage (U N ) should be indicated on the capacitor 2.5 minimum permissible capacitor operating temperature minimum permissible temperature on the outside of the case at the moment of switching on the capacitor 2.6 maximum permissible operating temperature(t C ) maximum permissible
38、 operating temperature of the hottest area of the outside of the capacitor case during operation 2.7 rated frequency (f N ) highest mains frequency for which the capacitor has been designed to operate, i.e.50Hz or60Hz 2.8 rated capacitance of the capacitor (C N ) capacitance value for which the capa
39、citor has been designed 2.9 rated current (I N ) the r.m.s. value of the alternating current at the rated voltage and frequency 2.10 type of capacitor capacitors are considered to be of the same type when of similar constructional form, the same constructional technology, the same rated voltage, the
40、 same climatic category and the same kind of operation. Capacitors of the same type can differ only in rated capacitance and size. Minor differences between terminations and mounting devices are permitted 2.11 model of capacitor capacitors are considered to be of the same model when they are of the
41、same construction and have the same functional and dimensional characteristics within the tolerance limits and are consequently interchangeable 2.12 application class of capacitor two application classes of capacitors are considered: standard class: capacitors for standard applications (household mi
42、crowave ovens); professional class: capacitors for commercial microwave ovens (microwave ovens for communities, refectories, canteens, hospitals, restaurants, etc.). 3 Service conditions This standard gives the requirements for capacitors intended for use under the following conditions: 3.1 Altitude
43、 Not exceeding 2000m. 3.2 Pollution Capacitors included in the scope of this standard are designed for operation in lightly polluted atmospheres.EN61270-1:1996 BSI 05-1999 5 NOTEThe IEC has not yet established a definition for “lightly polluted”. When this definition is established, it will be incor
44、porated in this standard. 3.3 Operating temperature Between 10C and+100C (see2.5 and2.6). The preferred minimum and maximum permissible capacitor operating temperatures are as follows: Capacitors shall be suitable for transport and storage at temperatures down to 25C, without adverse effect on their
45、 quality. 3.4 Damp heat severity The preferred severity is21days, according toIEC68-2-3. No lower severity is allowed. 4 Safety and construction 4.1 Safety 4.1.1 Capacitors shall be constructed in such a way that no external damage is caused in normal conditions of transport. 4.1.2 Where the individ
46、ual capacitor elements are protected by fuses, these fuses shall be so dimensioned and so arranged within the circuitry of the capacitor unit that they will not disconnect in the event of a short circuit occurring outside the capacitor unit when it is being operated at the rated voltages. The approp
47、riate fuse shall, however, operate in the event of the breakdown of one of the capacitor elements. 4.1.3 Resistors or diodes inside the capacitor case shall not reduce substantially the operational reliability of the capacitor, for instance due to the breakdown of the resistor or as a result of the
48、action of chemical substances. In any case these components shall meet the relevant IEC standards. 4.1.4 Discharge resistors structurally combined with capacitors shall be so dimensioned that the voltage at the capacitors terminals,1min after the operating voltage is switched off, shall have fallen
49、to below50V. They shall also withstand the voltage test in accordance with5.9. The effect of the superimposed d.c. voltage shall also be taken into account in the dimensioning of discharge resistors. 4.1.5 Capacitors for microwave ovens generally do not contain internal fuses. In case of internal breakdown, normally a low-resistance short circuit will result. In case of short circuit of the capacitor, if the fuse of the appliance is able to disconnect the electric circuit within3s, case rupture or fire will be
