1、BSI Standards Publication Electrical insulation systems Procedures for thermal evaluation Part 2: Selection of the appropriate test method for evaluation and classification of electrical insulation systems PD IEC/TR 61857-2:2015National foreword This Published Document is the UK implementation of IE
2、C/TR 61857-2:2015. The UK participation in its preparation was entrusted to Technical Committee GEL/112, Evaluation and qualification of electrical insulating materials and systems. A list of organizations represented on this committee can be obtained on request to its secretary. This publication do
3、es not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 87292 1 ICS 29.080.30 Compliance with a British Standard cannot confer immunity from
4、 legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 April 2015. Amendments/corrigenda issued since publication Date Text affected BRITISH STANDARD PD IEC/TR 61857-2:2015 IEC TR 61857-2 Edition 1.0 2015-04 TECHNICAL REPORT
5、 Electrical insulation 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 Internationa
6、l Electrotechnical Commission 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 ev
7、aluation . 6 4.2 Test objects 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 .
8、10 Table 3 Standards for 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 Par
9、t 2: Selection of the appropriate 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 Committee
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19、blications is indispensable 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
20、of IEC technical committees 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 T
21、R 61857-2, which is a technical 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
22、draft Report on voting 112/312/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 I
23、EC 61857 series, published 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
24、:/webstore.iec.ch“ in the 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 ELE
25、CTRICAL INSULATION SYSTEMS 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
26、proposed Electrical Insulation 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 existi
27、ng or proposed EIS used 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
28、normatively referenced in 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:
29、 Functional evaluation of 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 classificati
30、on of insulation systems 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
31、 thermal evaluation Part 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, El
32、ectrical insulation systems 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 E
33、IS IEC TS 61934, Electrical 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 evaluati
34、on of electrical endurance 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 re
35、quirements IEC TS 62332-2, 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 E
36、XAMPLE Such as the stator 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 c
37、ompleted product 3.3 rotating 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 th
38、e coil windings and metal 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 use
39、d in the design and development 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
40、of the EIS. If the purpose 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 th
41、e specific multi-factor 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 eval
42、uation can be conducted 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
43、 models. In addition to 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
44、 which are not separated 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 spe
45、cific aspects needed. 5 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 ty
46、pe of project is not intended 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 expect
47、ed to have more than thermal 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
48、IEC/TR 61857-2:2015 8 IEC 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
49、applications for the test 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 a
