1、 IEC 60076-3 Edition 3.0 2013-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Power transformers Part 3: Insulation levels, dielectric tests and external clearances in air Transformateurs de puissance Partie 3: Niveaux disolement, essais dilectriques et distances disolement dans lair IEC60076-3:2013
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16、ORME INTERNATIONALE Power transformers Part 3: Insulation levels, dielectric tests and external clearances in air Transformateurs de puissance Partie 3: Niveaux disolement, essais dilectriques et distances disolement dans lair INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INT
17、ERNATIONALE XA ICS 29.180 PRICE CODE CODE PRIX ISBN 978-2-83220-830-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! V
18、euillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 60076-3 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references 7 3 Terms and definitions . 7 4 General 8 5 Highest voltage for equipment and rated insulation level 10 6 Transformers wit
19、h re-connectable windings . 11 7 Dielectric tests 12 7.1 Overview . 12 7.2 Test requirements 13 7.2.1 General . 13 7.2.2 Test voltage levels . 14 7.2.3 Test sequence . 17 7.3 Test requirements for specific transformers . 17 7.3.1 Tests for transformers with Um 72,5 kV . 17 7.3.2 Tests on transformer
20、s with 72,5 kV 170 kV . 19 7.4 Assigning Umand test voltages to the neutral terminal of a winding . 20 7.4.1 Transformers with Um 72,5 kV 20 7.4.2 Transformers with Um 72,5 kV 20 8 Dielectric tests on transformers that have been in service . 20 9 Insulation of auxiliary wiring (AuxW) 21 10 Applied v
21、oltage test (AV) . 21 11 Induced voltage tests (IVW and IVPD) 22 11.1 General . 22 11.2 Induced voltage withstand test (IVW) . 22 11.3 Induced voltage test with partial discharge measurement (IVPD) 23 11.3.1 General . 23 11.3.2 Test duration and frequency . 23 11.3.3 Test sequence . 23 11.3.4 Partia
22、l discharge (PD) measurement 24 11.3.5 Test acceptance criteria . 25 12 Line terminal AC withstand test (LTAC) . 25 13 Lightning impulse tests (LI, LIC, LIN, LIMT) . 26 13.1 Requirements for all lightning impulse tests . 26 13.1.1 General . 26 13.1.2 Tap positions . 26 13.1.3 Records of tests . 26 1
23、3.1.4 Test connections 27 13.2 Full wave lightning impulse test (LI) . 28 13.2.1 Wave shape, determination of test voltage value and tolerances 28 13.2.2 Tests on transformers without non-linear elements . 29 13.2.3 Tests on transformers with non-linear elements 30 13.3 Chopped wave lightning impuls
24、e test (LIC) . 31 60076-3 IEC:2013 3 13.3.1 Wave shape. 31 13.3.2 Tests on transformers without non-linear elements . 31 13.3.3 Tests on transformers with non-linear elements 32 13.4 Lightning impulse test on a neutral terminal (LIN) . 33 13.4.1 General . 33 13.4.2 Waveshape 33 13.4.3 Test sequence
25、. 34 13.4.4 Test criteria . 34 14 Switching impulse test (SI) 34 14.1 General . 34 14.2 Test connections . 34 14.3 Waveshape . 35 14.4 Test sequence . 35 14.5 Test criteria . 35 15 Action following test failure . 36 16 External clearances in air 36 16.1 General . 36 16.2 Clearance requirements . 37
26、Annex A (informative) Application guide for partial discharge measurements on transformers . 40 Annex B (informative) Overvoltage transferred from the high-voltage winding to a low-voltage winding . 45 Annex C (informative) Information on transformer insulation and dielectric tests to be supplied wi
27、th an enquiry and with an order 47 Annex D (informative) Neutral insulation voltage level calculation . 50 Annex E (informative) Basis for dielectric tests, insulation levels and clearances 53 Bibliography 56 Figure 1 Time sequence for the application of test voltage for induced voltage test with pa
28、rtial discharge measurement (IVPD) 24 Figure A.1 Calibration circuit for partial discharge measurement using the test tap of condenser type bushing. 41 Figure A.2 Circuit for partial discharge measurement using a high-voltage coupling capacitor . 42 Figure B.1 Equivalent circuit for capacitive trans
29、fer of overvoltage 46 Table 1 Requirements and tests for different categories of windings 14 Table 2 Test voltage levels (1 of 2) . 15 Table 3 Test voltage levels used in special cases . 16 Table 4 Minimum clearances in air (1 of 2) . 38 4 60076-3 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _
30、 POWER TRANSFORMERS Part 3: Insulation levels, dielectric tests and external clearances in air FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of
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40、pensable 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. International Standard IEC 60076-
41、3 has been prepared by IEC technical committee 14: Power transformers. This third edition of IEC 60076-3 cancels and replaces the second edition published in 2000, and constitutes a technical revision. The main changes from the previous edition are as follows: Three categories of transformer are cle
42、arly identified together with the relevant test requirements, these are summarised in Table 1. Switching impulse levels are defined for all Um 72,5kV. The procedure for Induced voltage tests with PD has been revised to ensure adequate phase to phase test voltages. The AC withstand test has been rede
43、fined (LTAC instead of ACSD). Induced voltage tests are now based on Urrather than Um. New requirements for impulse waveshape (k factor) have been introduced. 60076-3 IEC:2013 5 Tables of test levels have been merged and aligned with IEC 60071-1:2010. Additional test levels have been introduced for
44、Um 800kV. A new Annex E has been introduced, which sets out the principles used in assigning the tests, test levels and clearances in air. The text of this standard is based on the following documents: FDIS Report on voting 14/745/FDIS 14/749/RVD Full information on the voting for the approval of th
45、is standard 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 the parts in the IEC 60076 series, under the general title Power transformers, can be found on the IEC website. The commit
46、tee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised editio
47、n, or amended. 6 60076-3 IEC:2013 INTRODUCTION This part of IEC 60076 specifies the insulation requirements and the corresponding insulation tests with reference to specific windings and their terminals. It also recommends external clearances in air (Clause 16). The insulation levels and dielectric
48、tests which are specified in this standard apply to the internal insulation only. Whilst it is reasonable that the rated withstand voltage values which are specified for the internal insulation of the transformer should also be taken as a reference for its external insulation, this may not be true i
49、n all cases. A failure of the non-self-restoring internal insulation is catastrophic and normally leads to the transformer being out of service for a long period, while an external flashover may involve only a short interruption of service without causing lasting damage. Therefore, it may be that, for increased safety, higher test voltages are specified by the purchaser for the internal insulation of the transformer t
