1、 IEC 61857-31 Edition 1.0 2017-01 INTERNATIONAL STANDARD Electrical insulation systems Procedures for thermal evaluation Part 31: Applications with a designed life of 5 000 h or less IEC 61857-31:2017-01(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights r
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9、Glossary - std.iec.ch/glossary 65 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002. Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR. IEC Customer Service Cent
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11、ations with a designed life of 5 000 h or less INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.080.30 ISBN 978-2-8322-3843-1 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 61857-31:201
12、7 IEC 2017 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms and definitions 6 4 EIS evaluation . 7 5 Test objects . 7 6 Test procedures 7 6.1 Procedure A: Establishing a TE for applications with a designed life of 1 500 h or less: one-temperature ageing . 7 6.2 Proce
13、dure B: Establishing a TE rating for applications with a designed life of 5 000 h or less: one-temperature ageing . 8 6.3 Procedure C: Establishing a TE rating for applications with a designed life of 5 000 h or less: two-temperature ageing . 8 7 Data analysis . 8 7.1 Analysis Test Procedures A and
14、B (See 6.1 and 6.2) . 8 7.2 Analysis Test Procedure C (See 6.3) . 9 8 Test report . 9 Bibliography 10 IEC 61857-31:2017 IEC 2017 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 31: Applications with a designed life of 5 000 h or less
15、 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 is to promote international co-operation on all questions concerning standardization in th
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24、ication, 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 indispensable for the correct application of this publication. 9) Attention is drawn to the possib
25、ility 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. International Standard IEC 61857-31 has been prepared by IEC technical committee 112: Evaluation and qualification of electric
26、al insulating materials and systems. The text of this International Standard is based on the following documents: CDV Report on voting 112/356/CDV 112/375/RVC Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above ta
27、ble. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 IEC 61857-31:2017 IEC 2017 A list of all parts in the IEC 61857 series, published under the general title Electrical insulation systems Procedures for thermal evaluation, can be found on the IEC website. The com
28、mittee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced by a revised edition, or a
29、mended. A bilingual version of this publication may be issued at a later date. IEC 61857-31:2017 IEC 2017 5 INTRODUCTION IEC 61857-1 provides the general structure to be followed for an electrical insulation system (EIS) evaluation and classification. IEC TR 61857-2 provides guidelines to identify t
30、he application and to select the preferred test method based on the application. This part of IEC 61857 provides a test method for EIS applications, such as the automotive industry, when the designed life is 5 000 h or less. The selection of this test method can be decided by the end product applica
31、tion. 6 IEC 61857-31:2017 IEC 2017 ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 31: Applications with a designed life of 5 000 h or less 1 Scope This part of IEC 61857 establishes an EIS evaluation for applications with a designed life of 5 000 h or less. This test method fol
32、lows the procedures of IEC 60505 and is modified based on the range of designed life. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited app
33、lies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60505, Evaluation and qualification of electrical insulation systems IEC 61857-1, Electrical insulation systems Procedures for thermal evaluation Part 1: General requirements Low-volta
34、ge IEC TR 61857-2, Electrical insulation systems Procedures for thermal evaluation Part 2: Selection of the appropriate test method for evaluation and classification of electrical insulation systems IEC 61857-21, Electrical insulation systems Procedures for thermal evaluation Part 21: Specific requi
35、rements 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) 3 Terms and definitions For the purposes of this document,
36、 the terms and definitions given in IEC 61857-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.
37、1 designed life expected application time which is proposed or decided by an end user, an industrial manufacturer, etc., regardless of the duty cycle, continual or intermittent IEC 61857-31:2017 IEC 2017 7 3.2 thermal endurance TE maximum designed temperature for the selected time coordinate 3.3 ave
38、rage life AL mean value of life 4 EIS evaluation Procedure A (see Clause 6) is intended for EIS with a designed life of 1 500 h or less, subjecting one set of test objects to one-temperature ageing at 10 K above the maximum design temperature. The average life of the set under evaluation shall be at
39、 least 1 500 h. Procedure B (see Clause 6) is intended for EIS with a designed life of 5 000 h or less, subjecting one set of test objects to one-temperature ageing at 10 K above the maximum design temperature. The ageing time in Procedure A may be increased up to 5 000 h to correspond to the design
40、ed life of the EIS. The average life of the set under evaluation shall be at least 1 500 h. Procedure C (see Clause 6) is intended for EIS with a designed life of 5 000 h or less, subjecting two sets of test objects to two-temperature ageing at 20 K to 30 K and 30 K to 35 K above the maximum design
41、temperature. The test results determined by either Procedure A, Procedure B or Procedure C described in Clause 6 can be expanded to larger full thermal evaluations in accordance with IEC 61857 (all parts), if the additional thermal ageing is started prior to the completion of the thermal ageing acco
42、rding to this document. When expanded to a full thermal ageing, the work undertaken according to this document is referred to as a screening test portion of the full thermal ageing. Also, IEC 61857-1 and IEC TR 61857-2 may require a reference EIS to be included in the evaluation for establishing a r
43、elative thermal endurance (RTE) rating. When expansion is needed, an evaluation with regard to other applications shall require the addition of a reference EIS in accordance with an EIS method selected from IEC TR 61857-2. 5 Test objects The test objects and test equipment shall be in accordance wit
44、h the appropriate test method selected from IEC TR 61857-2. 6 Test procedures 6.1 Procedure A: Establishing a TE for applications with a designed life of 1 500 h or less: one-temperature ageing Follow the procedures of the selected test method. For the selected test method, one test cycle consists o
45、f: thermal ageing subcycle according to IEC 60505, conditioning subcycle according to IEC TR 61857-2, for example IEC 61857-21 or IEC 61857-22, and diagnostic testing in accordance with the procedures of the test method selected from IEC TR 61857-2. The selected ageing temperature shall be 10 K abov
46、e the maximum design temperature. 8 IEC 61857-31:2017 IEC 2017 The average life of the set under evaluation shall be at least 1 500 h. To accumulate at least 1 500 h prior to the breakdown of the EIS the ageing cycle shall be 168 h. NOTE 168 hours (one week) is used for accumulating more than 1 500
47、ageing hours in nine ageing cycles. If the set of test objects exceeds the original test time of 1 500 h the test may be terminated as the target was achieved or the thermal ageing may be continued to achieve an expanded goal. 6.2 Procedure B: Establishing a TE rating for applications with a designe
48、d life of 5 000 h or less: one-temperature ageing The one-temperature ageing described in Procedure A can be extended to accumulate additional hours. The set undergoing thermal evaluation under Procedure A can be extended to a time coordinate of up to 5 000 h. 6.3 Procedure C: Establishing a TE rati
49、ng for applications with a designed life of 5 000 h or less: two-temperature ageing For these two-temperature ageing applications, the recommendation is for two sets of the candidate EIS test objects to undergo test cycles at each of two elevated ageing temperatures. One test cycle consists of thermal ageing subcycle according to IEC 60505, conditioning subcycle, and diagnostic testing in accordance with the procedures of the test method selected from IEC TR
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