英文原版 IEC 60076-11:2018 电力变压器第11部分:干式变压器.pdf

IEC IEC60076-11
Edition 2.02018-08 INTERNATIONAL STANDARD NuRME INTERNATIONALE
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Powertransformers- Part 11: Dry-type transformers Transformateurs depuissance- Partie 11:Transformateursde typesec
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-5910-8 Warming! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agree.
IEC 60076-11:2018/ISH1:2020 @ IEC 2020 INTERNATIONAL ELECTROTECHNICALCOMMISSION
IEC 60076-11 Edition 2.0 2018-08
POWERTRANSFORMERS- Part 11:Dry-type transformers
INTERPRETATIONSHEET
This interpretation sheet has been prepared by IEC technical mittee 14:Power transformers. The text of this interpretation sheet is based on the following documents: DISH Report on voting 14/1052/DISH14/1054/RVDISH
report on voting indicated in the above table.
14.3.2 Temperature-rise test Question
transformers or its inspectors witness this testing at the manufacturers’ premises. The between a manufacturer and the inspector on where exactly the resistance should be measured. The inspector requested that the resistance be measured on “winding lead exits* *winding terminals" which in its opinion were the bushings on the enclosure cover.
ICS 29.180
IEC 60076-11:2018/ISH1:2020 @IEC2020 Subclause 14.3.2.1 General, states:
by superposition method. For the determination of the average winding temperature rise the measured temperatures of the cooling air or of the water intake of the cooling equipment shall be used. For three-phase transformers, the resistance measurements shall be made between the central and an outer phase line terminals. windings. NOTE When the temperature rise is perfomed it is advisable to measure the windings resistance close to the Where should the measurements be made? Interpretation Testing of the winding resistance at transformer terminals (bushings) includes leadwork or
could be lower than if the winding resistance were tested directly on the winding lead exits. That is why the standard suggests (in the NOTE) that measurement of the windings resistance be carried out close to the windings. That way, the accuracy of the indirect winding temperature measurement by resistance is higher. In the case of dry-type transformers without enclosures, it is possible to have access close to measurements shall normally be made at such locations. On the other hand, if the dry-type transformer is equipped with an enclosure, the resistance to carry out the test (hence, affecting the normal cooling efficiency of the unit). Nevertheless. the advice to measure the resistance normally close to the winding lead exits holds. Limiting the enclosure opening by using special through elements for the cabling and/or by closing the required opening by temporary means as well as possible will minimize the impact on the normal cooling efficiency.
-2-IEC 60076-11:2018 IEC 2018 CONTENTS FOREWORD.6 1Scope...8 2Normative references.. 3Terms and definitions..... 4Service conditions .......10 4.1General.10 4.2Normal service conditions...10 4.3Electromagnetic patibility (EMC)..11 5Rating and general requirements..12 5.1General..12 5.2Rated power ..12 5.2.1General..12 5.2.2Definition of the rated power with fans cooling or heat exchangers.12 5.2.3Transformer IPoo (without enclosure) ...... 12 5.2.4Transformer with enclosure...12 5.2.5Preferred values of rated power....13 5.2.6Loading beyond rated power....13 5.3Provision for unusual service conditions.....13 5.4Transportation and storage. .14 5.4.1Transport limitation.14 5.4.2Transport acceleration..14 5.4.3Temperature and environment conditions for transport and storag....14 5.5Rated voltage and rated frequency...15 5.5.1Rated voltage..15 5.5.2Rated frequency....15 5.6Operation at higher than rated voltage..15 5.7Highest voltage for equipment Up and dielectric tests levels..15 5.8Identification according to cooling method .15 5.8.1General.15 5.8.2Identification symbols...15 5.8.3Arrangement of symbols..16 5.9Guaranteed temperature rise at rated conditions...16 5.10Additional information required for enquiry. 5.11Sound level...16 5.12Components and materials.16 6Tappings.16 7Connections 8Ability to withstand short circuit ..17 9Rating plate....7 9.1Rating plate fitted to the transformer..17 9.2Rating plate fitted to the transformer enclosure ....18 10Temperature-rise limits......18 10.1Normal temperature-rise limits.-..18 10.2Reduced temperature rises for transformers designed for high cooling medium temperatures or special cooling medium conditions ..19
IEC 60076-11:2018 IEC 2018 10.3High altitude temperature rise correction..19 11Insulation levels..19 11.1General..19 11.2Transformers for use at high alitudes...0 12 Climatic, environmental and fire behaviour classes..21 12.1Climatic classes..21 12.2Environmental classes.21 12.2.1Transformers for indoor application with or without enclos...