1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA ICS 61800-6 TR-2015 Adjustable Speed Electrical Power Drive Systems Part 6: Guide for Determination of Types of Load Duty and Corresponding Current RatingsNEMA Standards Publication ICS 61800-6 TR-2015 Adjustable Speed Elect
2、rical Power Drive Systems Part 6: Guide for Determination of Types of Load Duty and Corresponding Current Ratings Published by: National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2015 National Electrical Manufacturers Association. All
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13、 to NEMA and is solely the responsibility of the certifier or maker of the statement. NEMA ICS 61800-6 TR-2015 Page i 2015 National Electrical Manufacturers Association Foreword 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all nati
14、onal electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation 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.
15、Their preparation is entrusted to technical 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 collabo
16、rates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion
17、 on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and
18、they are accepted by the National Committees in that sense. 4) In 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 S
19、tandard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn t
20、o the possibility that some of the elements of this technical report may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committ
21、ee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art”. IEC 61800-6, which is a technical report, has been prepared by subcommittee 22G: Semiconductor power
22、 converters for adjustable speed electric drive systems, of IEC technical committee 22: Power electronics systems and equipment. This first edition cancels and replaces IEC 61136-1, issued in 1992, and constitutes a technical revision. The text of this technical report is based on the following docu
23、ments: Enquiry draft Report on voting 22G/85/DTR 22G/100/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee
24、has decided that the contents of this publication will remain unchanged until 2008. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. NEMA ICS 61800-6 TR-2015 Page ii 2015 National Electrical Manufacturers Association Contents Foreword i 1 Scope
25、 and Object 1 1.1 DV (US DEVIATION) 1 1.2 NORMATIVE REFERENCES . 1 1.3 DV . 1 2 Terms, Definitions, and Symbols 1 2.1 TERMS AND DEFINITIONS . 1 2.2 SYMBOLS . 5 3 Rated Values . 6 3.1 GENERAL . 6 3.2 SYSTEM OF ESTABLISHING RATED CURRENT-TIME VALUES FOR SEMICONDUCTOR ASSEMBLIES AND EQUIPMENTS 7 3.2.1
26、General 7 3.2.2 Rated Current of a Common Converter Transformer . 7 3.2.3 Rated Values of a Double Converter . 7 3.2.4 Determination of Type of Load Duty 7 3.3 RATED CURRENTS FOR EQUIPMENTS AND SECTIONS . 7 3.3.1 General 7 3.3.2 Rated Currents for Uniform Load Duty 8 3.3.3 Rated Currents for Intermi
27、ttent Peak Load Duty . 8 3.3.4 Rated Currents for Intermittent Load Duty 8 3.3.5 Rated Currents for Intermittent Load Duty with No-Load Intervals 8 3.3.6 Rated Currents for Repetitive Load Duty . 8 3.3.7 Rated Currents for Non-Repetitive Load Duty . 9 3.4 OVERLOAD AND SURGE CURRENT CAPABILITY . 11 4
28、 Duty Classes for Non-Repetitive Load Duty 11 Figures Figure 1 Typical Current-Time Chart for Uniform Load Duty . 2 Figure 2 Typical Current-Time Chart for Intermittent Peak Load Duty . 2 Figure 3 Typical Current-Time Chart for Intermittent Load Duty 3 Figure 4 Typical Time Chart for Intermittent Lo
29、ad Duty with No-Load Intervals 3 Figure 5 Example of Current-Time Chart for Repetitive Load Duty . 4 Figure 6 Typical Current-Time Chart for Non-Repetitive Load Duty 4 Figure 7 Equivalent Repetitive Load Duty Load-Time Chart 9 Figure 8 Typical Rating Curves for Non-Repetitive Load Duty . 10 Tables T
30、able 1 List of Symbols 5 Table 2 Duty Classes for Non-Repetitive Industrial Applications . 11 NEMA ICS 61800-6 TR-2015 Page 1 2015 National Electrical Manufacturers Association 1 Scope and Object This technical report provides alternative methods for specifying ratings for adjustable speed electrica
31、l power drive systems (PDS) and, in particular, their basic drive modules (BDM). It is not intended to cover adjustable speed drives for traction purposes. General rules for rating specification for low voltage adjustable speed d.c. power drive systems are contained in IEC 61800-1, and for low volta
32、ge adjustable frequency a.c. power drive systems in IEC 61800-2. 1.1 DV (US DEVIATION) Other than the definition of load profiles, this document is primarily suitable for use with drives covered under the scope of NEMA ICS 61800-1. 1.2 NORMATIVE REFERENCES The following referenced documents are indi
33、spensable for the application 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 60146-1-1, Semiconductor convertors General requirements and line commutated convertors
34、Part 1-1: Specifications of basic requirements IEC 61800-1, Adjustable speed electrical power drive systems Part 1: General requirements Rating specifications for low voltage adjustable speed d.c. power drive systems IEC 61800-2, Adjustable speed electrical power drive systems Part 2: General requir
35、ements Rating specifications for low voltage adjustable frequency a.c. power drive systems 1.3 DV NEMA/ICS 61800-1, Adjustable Speed Electrical Power Drive Systems Part 1: General Requirements Rating Specifications for Low Voltage Adjustable Speed d.c. Power Drive Systems NEMA/ICS 61800-2, Adjustabl
36、e Speed Electrical Power Drive Systems Part 2: General Requirements Rating Specifications for Low Voltage Adjustable Frequency a.c. Power Drive Systems 2 Terms, Definitions, and Symbols 2.1 TERMS AND DEFINITIONS For the purpose of this technical report, the definitions given in IEC 61800-1, IEC 6180
37、0-2, and IEC 60146-1-1, as well as the following, apply. 2.1.1 equilibrium temperature: steady-state temperature reached by a component of a converter under specified conditions of load and cooling. NOTESteady-state temperatures are, in general, different for different components. The times necessar
38、y to establish the steady state are also different and proportional to thermal time constants. 2.1.2 current-time load chart: record of load current with respect to time. NEMA ICS 61800-6 TR-2015 Page 2 2015 National Electrical Manufacturers Association 2.1.3 uniform load duty: duty for which a conv
39、erter equipment carries a current of fixed value for an interval sufficiently long for the components of the converter to reach equilibrium temperatures corresponding to the said value of current. Figure 1 illustrates this type of load duty (see Table 1 for symbols). IbjjIatIEC 884/03Figure 1 Typica
40、l Current-Time Chart for Uniform Load Duty 2.1.4 intermittent peak load duty: type of duty for which loads of high magnitude and short duration are applied following no-load periods, such that thermal equilibrium is reached between successive applications of the load. Figure 2 illustrates this type
41、of load duty. The intermittent loads need not be equidistant, but the minimum value of t0 to achieve no-load semiconductor temperature before the next intermittent load should be specified by the manufacturer. t0IpjjIattpIEC 885/03Figure 2 Typical Current-Time Chart for Intermittent Peak Load Duty N
42、EMA ICS 61800-6 TR-2015 Page 3 2015 National Electrical Manufacturers Association 2.1.5 intermittent load duty: type of duty for which intermittent loads are superimposed onto a constant base load, such that thermal equilibrium is reached between successive applications of the intermittent load. Fig
43、ure 3 illustrates this type of load duty. The intermittent loads need not be equidistant, but the minimum value of tb to achieve steady-state semiconductor temperature before the next intermittent load is applied should be specified by the manufacturer. tbIbIpjjIattpIEC 886/03Figure 3 Typical Curren
44、t-Time Chart for Intermittent Load Duty 2.1.6 intermittent load duty with no-load intervals: type of duty for which intermittent no-load intervals followed by high-load intervals are superimposed onto a constant base load, such that thermal equilibrium is reached between successive applications of t
45、he intermittent load. Figure 4 illustrates this type of load duty. The intermittent loads need not be equidistant, but the minimum value of tb to achieve steady-state semiconductor temperature before the next intermittent load is applied should be specified by the manufacturer. tbIpjjIatIbt0tpIEC 88
46、7/03Figure 4 Typical Time Chart for Intermittent Load Duty with No-Load Intervals NEMA ICS 61800-6 TR-2015 Page 4 2015 National Electrical Manufacturers Association 2.1.7 repetitive load duty: type of duty for which loads are cyclically variable, such that steady-state temperature is not reached wit
47、hin the cycle period, and hence no base load can be given. Thermal equilibrium is reached when the average j does not vary from load cycle to load cycle. Figure 5 illustrates this type of load duty. tsIvIpjjIatImIsIEC 888/03Figure 5 Example of Current-Time Chart for Repetitive Load Duty 2.1.8 non-re
48、petitive load duty: type of duty for which a peak load is applied at the end of a constant load period during which thermal equilibrium is reached. Figure 6 illustrates this kind of load duty. IbIpjjIattpIEC 889/03Figure 6 Typical Current-Time Chart for Non-Repetitive Load Duty 2.1.9 reversible conv
49、erter: line-side converter in which the flow of dc power is reversible. 2.1.10 double converter: current stiff reversible ac/dc converter with direct current in both directions. NEMA ICS 61800-6 TR-2015 Page 5 2015 National Electrical Manufacturers Association A double converter usually consists of two sections, one for each direction of current flow. NOTEThe converter sections may be supplied from common windings, from separate windings on a common transformer, or from separate transformers. 2.1.10 DV “Double converter” is al
