BS PD IEC TR 61857-2-2015 Electrical insulation systems Procedures for thermal evaluation Selection of the appropriate test method for evaluation and classification of electrical i.pdf

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1、BSI Standards PublicationElectrical insulation systems Procedures for thermal evaluationPart 2: Selection of the appropriate test method for evaluation and classification of electrical insulation systemsPD IEC/TR 61857-2:2015National forewordThis Published Document is the UK implementation of IEC/TR

2、 61857-2:2015.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/112, Evaluation and qualification of electrical insulatingmaterials and systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not pur

3、port to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 87292 1ICS 29.080.30Compliance with a British Standard cannot confer immunity fromlegal obligatio

4、ns.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 30 April 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDPD IEC/TR 61857-2:2015IEC TR 61857-2 Edition 1.0 2015-04 TECHNICAL REPORT Electrical insulation

5、systems Procedures for thermal evaluation Part 2: Selection of the appropriate test method for evaluation and classification of electrical insulation systems INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.080.30 ISBN 978-2-8322-2594-3 Registered trademark of the International Electrotechnical Comm

6、ission Warning! Make sure that you obtained this publication from an authorized distributor. PD IEC/TR 61857-2:2015 2 IEC TR 61857-2:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Terms and definitions 6 4 General information . 6 4.1 Purpose of the evaluation . 6 4.2 Test o

7、bjects 7 4.3 Test stresses 7 5 Design and development of the scope of work for the EIS evaluation. 7 6 Test methods for the evaluation and classification of EIS 7 Table 1 Evaluation for thermal stresses in air . 9 Table 2 Standards for the modification of an established EIS . 10 Table 3 Standards fo

8、r special environmental applications 10 Table 4 For evaluation prior to the start of long-term thermal ageing 10 PD IEC/TR 61857-2:2015IEC TR 61857-2:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 2: Selection of the a

9、ppropriate test method for evaluation and classification of electrical insulation systems FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC i

10、s 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, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) an

11、d Guides (hereafter referred to as “IEC Publication(s)”). 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

12、 IEC also participate in this preparation. IEC collaborates 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 IEC on technical matters express, as nearly

13、as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that se

14、nse. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees un

15、dertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any a

16、ttestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest editi

17、on of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether dire

18、ct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensa

19、ble for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committ

20、ees is to prepare International Standards. However, a technical committee 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 TR 61857-2, which is a te

21、chnical report, has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems. PD IEC/TR 61857-2:2015 4 IEC TR 61857-2:2015 IEC 2015 The text of this technical report is based on the following documents: Enquiry draft Report on voting 1

22、12/312/DTR 112/318/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. A list of all parts in the IEC 61857 series, publish

23、ed under the general title Electrical insulation systems Procedures for thermal evaluation, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in th

24、e data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. PD IEC/TR 61857-2:2015IEC TR 61857-2:2015 IEC 2015 5 ELECTRICAL INSULATION SYSTE

25、MS PROCEDURES FOR THERMAL EVALUATION Part 2: Selection of the appropriate test method for evaluation and classification of electrical insulation systems 1 Scope This part of IEC 61857 gives guidelines to identify the appropriate test method to be used for the evaluation of a proposed Electrical Insu

26、lation System (EIS). Some of the standards are for evaluation and classification of the EIS, while other standards identify the appropriate method to evaluate single or multi-factor stresses of a proposed or of an established EIS. This Technical Report is applicable to existing or proposed EIS used

27、in electrotechnical products across a wide range of operating voltages of IEC Standards. The report takes care to select the appropriate standard based on construction and intended operating conditions. 2 Normative references The following documents, in whole or in part, are normatively referenced i

28、n this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60034-18-21, Rotating electrical machines Part 18-21: Functional evaluation o

29、f insulation systems Test procedures for wire-wound windings Thermal evaluation and classification IEC 60034-18-31, Rotating electrical machines Part 18-31: Functional evaluation of insulation systems Test procedures for form-wound windings Thermal evaluation and classification of insulation systems

30、 used in rotating machines IEC 60505, Evaluation and qualification of electrical insulation systems IEC 61857-1, Electrical insulation systems Procedures for thermal evaluation Part 1: General requirements Low-voltage IEC 61857-21, Electrical insulation systems Procedures for thermal evaluation Part

31、 21: Specific requirements for general-purpose models Wire-wound applications IEC 61857-22, Electrical insulation systems Procedures for thermal evaluation Part 22: Specific requirements for encapsulated-coil model Wire-wound electrical insulation system (EIS) IEC 61858-1, Electrical insulation syst

32、ems Thermal evaluation of modifications to an established electrical insulation system (EIS) Part 1: Wire-wound winding EIS IEC 61858-2, Electrical insulation systems Thermal evaluation of modifications to an established electrical insulation system (EIS) Part 2: Form-wound EIS IEC TS 61934, Electri

33、cal insulating materials and systems Electrical measurement of partial discharges (PD) under short rise time and repetitive voltage impulses PD IEC/TR 61857-2:2015 6 IEC TR 61857-2:2015 IEC 2015 IEC 62068, Electrical insulating materials and systems General method of evaluation of electrical enduran

34、ce under repetitive voltage impulses IEC TS 62101, Electrical insulation systems Short-time evaluation of combined thermal and electrical stresses IEC TS 62332-1, Electrical insulation systems (EIS) Thermal evaluation of combined liquid and solid components Part 1: General requirements IEC TS 62332-

35、2, Electrical insulation systems (EIS) Thermal evaluation of combined liquid and solid components Part 2: Simplified test 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 completed product production unit or prototype EXAMPLE Such as the stato

36、r or rotor section of a rotating machine, a coil for a transformer or solenoid or similar design which is a usable product. 3.2 test/lab model test object constructed with all essential electrical insulating materials and processing expected to be used in manufacturing of a completed product 3.3 rot

37、ating machinery motor or generator 3.4 encapsulated device electrotechnical device embedded in resin in order to ensure its safe operation EXAMPLE Resin: as an integral component needed to provide safe operation of the electrotechnical device; and/or fills the void between the coil windings and meta

38、l parts which can be at earth (ground) potential; and/or in designs where the resin provides the outer electrical insulation barrier once the moulding shell or moulding housing is removed. 4 General information 4.1 Purpose of the evaluation The most essential aspect to be used in the design and deve

39、lopment of the project is to define the purpose of the evaluation. If the purpose is to establish the thermal classification of the EIS to be used in the manufacturing of products, the selected test method shall be one which evaluates the thermal decomposition characteristic of the EIS. If the purpo

40、se of the project is to evaluate more than the thermal classification, which can also include expected stresses related to the application such as: processing, PD IEC/TR 61857-2:2015IEC TR 61857-2:2015 IEC 2015 7 design, construction, the selected test method shall include the specific multi-factor

41、evaluation characteristics. Tables 1 to 4 present the list of test methods. 4.2 Test objects There are two levels or types of test objects which can be used in the design and development of a project to evaluate the performance of the EIS used in a completed product. The evaluation can be conducted

42、with test objects being: a) completed products The completed product can be a rotating machine covering motors and generators. The completed product can be a solenoid coil or transformer with no moving components. b) lab models: models can be pre-production units or lab sized models. In addition to

43、the basic information, the intended operating voltage shall be included in the selection process. Low-voltage: the most common value for the operating supply voltage is 600 VAC or below. Medium or High voltage: operating voltage above 600 VAC except for the form-wound designs which are not separated

44、 by operating voltage. 4.3 Test stresses As presented in IEC 60505, there are four main areas of possible concern in the design and development of an EIS evaluation: thermal electrical environmental mechanical The selection of the appropriate test method shall include the specific aspects needed. 5

45、Design and development of the scope of work for the EIS evaluation Evaluation and thermal classification of an EIS for use in a completed product should be focused on thermal decomposition as the single or most dominant cause of decomposition and breakdown of the EIS. This type of project is not int

46、ended to evaluate other factors of possible product failure which may be part of the real world application. Evaluation and classification of an EIS project for use in the evaluation of a completed product with the inclusion of processing, design and/or construction is expected to have more than the

47、rmal decomposition as a measurable factor. This can also be described as multi-factor testing. 6 Test methods for the evaluation and classification of EIS Type of test objects: for each test method in Table 1 test objects shall be: a) completed products or b) lab models. PD IEC/TR 61857-2:2015 8 IEC

48、 TR 61857-2:2015 IEC 2015 Unless stated, the specific test method is limited to one category of test object. Table 1 provides IEC Standards (test methods) for the evaluation of thermal stresses in air, type of property being evaluated, test parameters and examples of common applications for the test

49、 method. Table 2 provides IEC Standards (test methods) for the modification of an established EIS. Table 3 provides IEC Standards (test methods) for special environment applications. Table 4 provides IEC Standards (test methods) for the evaluation of new materials, new processes, alternate designs and other aspects, the evaluation of which is beneficial, prior to the start of long-term thermal ageing. PD IEC/TR 61857-2:2

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