1、 IEC TS 61463 Edition 2.0 2016-07 TECHNICAL SPECIFICATION Bushings Seismic qualification IEC TS 61463:2016-07(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized
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10、her assistance, please contact the Customer Service Centre: csciec.ch. IEC TS 61463 Edition 2.0 2016-07 TECHNICAL SPECIFICATION Bushings Seismic qualification INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.080.20 ISBN 978-2-8322-3518-8 Registered trademark of the International Electrotechnical Com
11、mission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC TS 61463:2016 IEC 2016 CONTENTS FOREWORD 4 INTRODUCTION 6 1 Scope .7 2 Normative references 7 3 Terms and definitions 7 4 Symbols and abbreviated terms .8 5 Methods of seismic qualification 9 6 Severi
12、ties 10 6.1 At the ground 10 6.2 At the bushing flange 10 7 Qualification by static calculation . 11 8 Qualification by dynamic analysis 13 8.1 General 13 8.2 Modal analysis using the time-history method 14 8.3 Modal analysis using the RRS . 14 9 Qualification by vibration test . 14 9.1 General 14 9
13、.1.1 General . 14 9.1.2 Mounting . 15 9.1.3 External load . 15 9.1.4 Measurements . 15 9.1.5 Standard frequency range 15 9.1.6 Test methods . 15 9.1.7 Testing 17 9.2 Test on complete apparatus 18 9.3 Test on the bushing mounted on a simulating support 18 9.4 Test on the bushing alone . 18 10 Evaluat
14、ion of the seismic qualification 18 10.1 Combination of stresses 18 10.2 Cantilever test 19 10.3 Acceptance criteria . 19 11 Necessary exchange of information . 20 11.1 Information supplied by the apparatus manufacturer 20 11.2 Information supplied by the bushing manufacturer . 20 Annex A (informati
15、ve) Flow chart for seismic qualification 23 Annex B (informative) Natural frequency and damping determination: Free oscillation test . 24 B.1 Free oscillation test . 24 B.2 Sine sweep frequency search 25 Annex C (informative) Static calculation method Additional considerations 26 C.1 General 26 C.2
16、Effect of the first bending mode . 26 C.3 Determination of S c26 C.4 Value of a bg26 C.5 Typical seismic response of cantilever type structures . 27 IEC TS 61463:2016 IEC 2016 3 C.6 Superelevation factor K . 29 Annex D (informative) Qualification by static calculation Example on transformer bushing
17、33 D.1 Seismic ground motion 33 D.2 Critical part of the bushing 33 D.3 Static calculation . 33 D.3.1 General . 33 D.3.2 Seismic load 34 D.3.3 Wind load 35 D.3.4 Terminal load . 35 D.4 Guaranteed bending strength 36 Annex E (informative) Center clamped bushings 37 Bibliography . 40 Figure 1 Example
18、of model of the transformer system 14 Figure 2 RRS for ground mounted equipment ZPA = 0,5 g 1 2 . 17 Figure 3 Response factor R 21 Figure 4 Test with simulating support according to 9.3 . 22 Figure 5 Determination of the severity 22 Figure A.1 Flow chart for seismic qualification 23 Figure B.1 Typic
19、al case of free oscillations. 24 Figure B.2 Case of free oscillations with beats . 25 Figure C.1 Single degree of freedom system 27 Figure C.2 Structure at the flange of a bushing with cemented porcelain 5 7 . 28 Figure C.3 Spring stiffness C in function of cemented part geometry 5 7 . 29 Figure C.4
20、 Superelevation factor due to the existence of transformer body and foundation 5 . 30 Figure D.1 Critical part of the bushing 33 Figure D.2 Forces affecting the bushing . 34 Figure D.3 Porcelain diameters 35 Figure E.1 Failure process 6 37 Figure E.2 Failure process, flow chart 5 6 38 Figure E.3 Str
21、ess profile during the opening process 6 . 38 Figure E.4 Relation between compression and tensile stress in the bottom edge of the porcelain due to the opening process 6 . 39 Table 1 Ground acceleration levels 10 Table 2 Dynamic parameters obtained from experience on bushings with porcelain insulato
22、rs (f 0= natural frequency, d = damping) 12 Table 3 Dynamic parameters obtained from experience on bushings with composite insulators (f 0 = natural frequency, d = damping) . 12 Table 4 Example of qualification level: AG5: ZPA = 0,5 g 17 Table 5 Response factor R . 21 Table C.1 Examples of typical s
23、eismic responses . 31 4 IEC TS 61463:2016 IEC 2016 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ BUSHINGS SEISMIC QUALIFICATION FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC Natio
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36、transformed into International Standards. IEC 61463, which is a Technical Specification, has been prepared by subcommittee 36A: Insulated bushings, of IEC technical committee 36: Insulators. IEC TS 61463:2016 IEC 2016 5 The text of this document is based on the following documents: Enquiry draft Rep
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40、ore print this document using a colour printer. 6 IEC TS 61463:2016 IEC 2016 INTRODUCTION As it is not always possible to define accurately the seismic severity at the bushing flange level, IEC TS 61463, which is a Technical Specification, presents three alternative methods of qualification. The thr
41、ee methods are equally acceptable. If the required response spectrum (RRS) at the bushing flange is not known, a severity (in terms of acceleration values) based on standard response spectra at the ground level may be used to carry out qualification through one of the three methods described in this
42、 document. When the environmental characteristics are not sufficiently known, qualification by static calculation is acceptable. Where high safety reliability of equipment is required for a specific environment, precise data are used, therefore qualification by dynamic analysis or vibration test is
43、recommended. The choice between vibration testing and dynamic analysis depends mainly on the capacity of the test facility for the mass and volume of the specimen, and, also if non-linearities are expected. When qualification by dynamic analysis is foreseen, it is recommended that the numerical mode
44、l be adjusted by using vibration data (see Clause 5). This document was prepared with the intention of being applicable to bushings whatever their construction material and their internal configuration.The information contained, originally directed to porcelain bushings, has been partially updated t
45、o include also composite bushings. IEC TS 61463:2016 IEC 2016 7 BUSHINGS SEISMIC QUALIFICATION 1 Scope IEC TS 61463, which is a Technical Specification, is applicable to alternating current and direct current bushings for highest voltages above 52 kV (or with resonance frequencies placed inside the
46、seismic response spectrum), mounted on transformers, other apparatus or buildings. For bushings with highest voltages less than or equal to 52 kV (or with resonance frequencies placed outside from the seismic response spectrum), due to their characteristics, seismic qualification is not used as far
47、as construction practice and seismic construction practice comply with the state of the art. This document presents acceptable seismic qualification methods and requirements to demonstrate that a bushing can maintain its mechanical properties, insulate and carry current during and after an earthquak
48、e. The seismic qualification of a bushing is only performed upon request. 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 applies. For un
49、dated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-2-47, Environmental testing Part 2-47: Test Mounting of specimens for vibration, impact and similar dynamic tests IEC 60068-2-57, Environmental testing Part 2-57: Tests Test Ff: Vibration Time-history and sine-beat method IEC 60068-3-3:1991, Environmental testing Part 3-3: Guidance Seismic test methods for e
