1、BRITISH STANDARD BS IEC 1000-2-6:1995 Implementation of IEC1000-2-6:1995 Electromagnetic compatibility (EMC) Part 2: Environment Section 6: Assessment of the emission levels in the power supply of industrial plants as regards low-frequency conducted disturbances ICS 29.020BSIEC1000-2-6:1995 This Bri
2、tish Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comesintoeffect on 15 August1996 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference GEL/210 Draft fo
3、r comment 92/29707 DC ISBN 0 580 26019 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee GEL/210, Electromagnetic compatibility, upon which the following bodies were represented: Association of Control Manufacturers TACMA
4、 (BEAMA Ltd.) Association of Consulting Engineers Association of Manufacturers of Domestic Electrical Appliances Association of Manufacturers of Power Generating Systems BEAMA Ltd. BEAMA Metering Association British Industrial Truck Association British Lighting Association for the Preparation of Sta
5、ndards (BRITLAPS) British Telecommunications plc Building Automation and Mains Signalling Association (BAMSA) Department of Health Department of Trade and Industry Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Association ERA Technology Ltd. Federation of the E
6、lectronics Industry GAMBICA (BEAMA Ltd.) Health and Safety Executive Induction and Dielectric Heating Manufacturers Association Institution of Electrical Engineers International Association of Broadcasting Manufacturers Lighting Industry Federation Ltd. Ministry of Defence Motor Industry Research As
7、sociation National Air Traffic Services Power Supply Manufacturers Association PSMA (BEAMA Ltd.) Professional Lighting and Sound Association Radiocommunications Agency Rotating Electrical Machines Association (BEAMA Ltd.) Society of British Gas Industries Society of Motor Manufacturers and Traders L
8、td. Transmission and Distribution Association (BEAMA Ltd.) The following bodies were also represented in the drafting of the standard through subcommittee GEL/210/8, EMC Low frequency disturbances. Electrical Contractors Association Heating, Ventilating and Air Conditioning Association British Radio
9、 and Electronic Equipment Manufacturers Association Amendments issued since publication Amd. No. Date CommentsBSIEC1000-2-6:1995 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword v Text of IEC 1000-2-6 1BSIEC1000-2-6:1995 ii BSI 08-1999 National fore
10、word This British Standard reproduces verbatim IEC1000-2-6:1995 and implements it as the UK national standard. This British Standard is published under the direction of the Electrotechnical Sector Board whose Technical Committee GEL/210 has the responsibility to: aid enquirers to understand the text
11、; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standard
12、s, are available from Customer Services, BSI,389 Chiswick High Road, London W44AL. 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 itsel
13、f confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard IEC50(161):1990 BS4727 Glossary of electrotechnical, power, telecommunications, electronics, lighting and colour terms Part1 Terms common to power, telecommunications and electronics Gro
14、up09:1991: Electromagnetic compatibilty IEC146:1991 BS EN60146 Semiconductor converters. General requirements and line commutated converters Part1.1:1993 Specifications of basic requirements Part1.3:1993 Transformers and reactors IEC1000-3-3:1994 BS EN61000 Electromagnetic compatibility (EMC) Part3
15、Limits Section3:1995 Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated current less than or equal to16A IEC1000-3-5:1994 BS IEC1000 Electromagnetic compatibility (EMC) Part3 Limits Section 5:1994 Limitation of voltage fluctuations and flicker
16、 in low-voltage power supply systems for equipment with rated current greater than16A Summary of pages This document comprises a front cover, an inside front cover, pagesi and ii, theIEC title page, pages ii to vi, pages1 to50, an inside back cover and abackcover. This standard has been updated (see
17、 copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSIEC1000-2-6:1995 ii BSI 08-1999 Contents Page Foreword v Introduction 1 1 Scope 1 2 Normative references 1 3 General 2 4 Co-ordination of the emission limits with the
18、compatibility levels 3 5 Definitions 3 6 Survey of conducted emission of industrial equipment 4 7 Harmonics 4 8 Interharmonics 9 9 Three-phase unbalance 11 10 Voltage changes, flicker and voltage dips 13 Annex A (informative) Harmonic emission 25 Annex B (informative) Network impedances for calculat
19、ion of harmonic propagation and evaluation of harmonic voltage components 37 Annex C (informative) Interharmonic line current of indirect convertors 46 Annex D (informative) Three phase unbalance 49 Annex E (informative) Bibliographic references Inside back cover Figure 1 Examples of convertors or l
20、oads producing harmonic or interharmonic a.c. currents 15 Figure 2a Assessment of the resulting supply side impedance Z Leffective for an harmonic source I h 16 Figure 2b Assessment of the resulting harmonic voltage U hat the inplant point of coupling IPC regarding several harmonic current sources I
21、 h1 . I hn , the harmonic level U h0of the supply, the harmonic impedances Z A of the load side, and Z Lof the supply side 16 Figure 3 Diagrams of the interharmonic frequencies in the line current I hhof the a.c. supply produced by harmonic current I ihin the d.c. link. The parameter G is the ratio
22、between I hhand I ih 17 Figure 4 Interharmonic frequencies generated by a direct convertor 18 Figure 5 Measurement of harmonic and interharmonic voltages at the point of common coupling of a5,5MW cycloconvertor drive 19 Figure 6 Measurement of harmonic and interharmonic voltages and currents at the
23、point of common coupling and the6kV terminals of the transformer 20 Figure 7 Subsynchronous cascade 21 Figure 8 Harmonic and interharmonic currents measured on a super/sub-synchronous cascade drive 22 Figure 9 Example of line and continous spectra for arc furnace (amplitude I h /I LNwith respect to
24、the nominal furnace current as a function of harmonic of50Hz, bandwidth1Hz) 23 Figure 10 Steady state and dynamic voltage changes 23 Figure 11 Steady state and dynamic voltage changes 24BSIEC1000-2-6:1995 BSI 08-1999 iii Page Figure A.1 AC supply side thyristor convertor with inductive smoothing and
25、 a) d.c. drive and static compensation b) current source inverter c) additional capacitive smoothing and voltage source inverter 32 Figure A.2 Equivalent circuit for convertors producing harmonic and interharmonics current in the a.c. supply side 33 Figure A.3 AC supply side diode rectifier with cap
26、acitive smoothing and voltage source inverter 33 Figure A.4 Relative harmonic line current of order h=5 and7 depending on the trigger delay angle ! 34 Figure A.5 Primary voltage and current for a convertor linked to the mains via a transformer 35 Figure A.6 Relative harmonic a.c. supply side current
27、 of a diode rectifier in B6-connection feeding a ripple-free d.c. voltage 36 Figure A.7 Direct convertor with: a) single-phase output b) three-phase output (cycloconverter) 36 Figure A.8 AC controller connections 37 Figure B.1 Example of calculation of the impedance seen from convertor1 and converto
28、r2 42 Figure B.2 Harmonic impedance for a simple network. HV resonance 43 Figure B.3 Example of resonance in a low voltage network 44 Figure B.4 Harmonic impedance of complex network. Impedance p.u. based on100MVA 45 Figure C.1 Harmonic components of the d.c. voltage from a load-commutated convertor
29、 connected at the load side of a d.c. link 48 Figure C.2 Evaluation of the interharmonic frequency in the a.c. supply current as caused by a605Hz current in the d.c. link 49 Figure D.1 Single-phase load between phase R and neutral 50 Figure D.2 Load connected between phases S and T 50 Figure D.3 Neg
30、ative sequence recorded on a22kV arc furnace feeder with rated current of944A 50 Table 1 Sources of low-frequency conducted disturbances 4 Table 2 Diversity factor K ifor various values x and harmonic orders, x being the ratio between the load of the device being considered and the total disturbing
31、load of the plant 7 Table 3 Values a and b applicable to uniform statistical distribution of amplitudes and phase angles. Maximum amplitudes are all equal 8 Table 4 Overview of interharmonic current generation by convertors 9 Table A.1 Relative harmonic current at low d.c. ripple. R sc =20 27BSIEC10
32、00-2-6:1995 iv BSI 08-1999 Page Table A.2 Relative harmonic current at medium d.c. ripple. R sc =20 28 Table A.3 Relative harmonic component at high d.c. ripple. R sc =20 28 Table A.4 Relative harmonic current of a diode rectifier (B6) feeding a high capacitance 29 Table A.5 Values I hmax /I 1maxof
33、a single-phase a.c. controller for several harmonic orders depending on the load ratio R/Z 30BSIEC1000-2-6:1995 BSI 08-1999 v Foreword 1) The IEC (International Electrotechnical Commission) is a world-wide organization for standardization comprising all national electrotechnical committees (IEC Nati
34、onal Committees). The object of the IEC is to promote international cooperation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical
35、 committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Standa
36、rdization Organization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on which all the National Committees having a special interest therein are represe
37、nted, express, as nearly as possible, an international consensus of opinion on the subject dealt with. 3) They have the form of recommendations for international use published in the form of standards, technical reports or guides and they are accepted by the National Committees in that sense. 4) In
38、order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall
39、be clearly indicated in the latter. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical report of one of the following types: type1, when the required support cannot be obtaine
40、d for the publication of an International Standard, despite repeated efforts; type2, when the subject is still under technical development or where for any other reason there is the future but not immediate possibility of an agreement on an International Standard; type3, when a technical committee h
41、as collected data of a different kind from that which is normally published as an International Standard, for example “state of the art”. Technical reports of types1 and2 are subject to review within three years of publication to decide whether they can be transformed into International Standards. T
42、echnical reports of type3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid or useful. IEC1000-2-6, which is a technical report of type3, has been prepared by subcommittee77A: Low frequency phenomena, of IEC technical committee77:Electromagnetic
43、compatibility. The text of this technical report is based upon the following documents: Full information on the voting for the approval of this part can be found in the report on voting indicated in the above table. Annex A, Annex B, Annex C, Annex D and Annex E are for information only. Committee d
44、raft Survey of comments Report on voting 77A(Secretariat)94 77A(Secretariat)103 77A/130vi blankBSIEC1000-2-6:1995 BSI 08-1999 1 Introduction IEC1000 is published in separate parts according to the following structure: Part1: General General considerations (introduction, fundamental principles) Defin
45、itions, terminology Part2: Environment Description of the environment Classification of the environment Compatibility levels Part3: Limits Emission limits Immunity limits (in so far as they do not fall under responsibility of product committees) Part4: Testing and measurement techniques Measurement
46、techniques Testing techniques Part5: Installation and mitigation guidelines Installation guidelines Mitigation methods and devices Part9: Miscellaneous Each part is further subdivided into sections which are to be published either as International Standards, or as Technical Reports. These standards
47、and reports will be published in chronological order and numbered accordingly. This section is a technical report. 1 Scope This technical report recommends the procedures to assess the disturbance levels produced by the emission of the devices, equipment and systems installed in non-public networks
48、in industrial environment as far as the low-frequency conducted disturbances in the power supply are concerned; on this basis, the relevant emission limits can be derived. It applies to low and medium voltage a.c. non-public supply at50/60Hz. Networks for ships, aircraft, off-shore platforms, and ra
49、ilways are out of the scope of this report. This technical report deals with the low-frequency conducted disturbances emitted by equipment connected to the power supply. The disturbances considered are: harmonics and interharmonics; unbalances; voltage changes; voltage dips. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this technical report. At the time of publication, the ed
