IEEE Guid for the evaluation and reconditioning of liquid immersed power transfomers.pdf
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1、IEEE Std C57.140-2006 IEEE Guide for the Evaluation and Reconditioning of Liquid Immersed Power Transformers I E E E 3 Park Avenue New York, NY 10016-5997, USA 27 April 2007 IEEE Power Engineering Society Sponsored by the Transformers Committee Copyright The Institute of Electrical and Electronics E
2、ngineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Gearhard, Marcus Not for Resale, 06/01/2007 01:51:05 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided
3、by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Gearhard, Marcus Not for Resale, 06/01/2007 01:51:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C57.140-2006 IEEE Guide for the Evaluation and Reconditioning of Liquid Immersed Power Transfo
4、rmers Sponsor Transformers Committee of the IEEE Power Engineering Society Approved 16 November 2006 IEEE-SA Standards Board Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Gearhard, Marcus Not for R
5、esale, 06/01/2007 01:51:05 MDTNo reproduction or networking permitted without license from IHS -,-,- Abstract: This guide includes guidelines for the following: insulating oil maintenance and diagnostics, oil reclamation, testing methods for the determination of remaining insulation (paper) life, an
6、d upgrades of auxiliary equipment such as bushings, gauges, deenergized tap changers (DETCs), load tap changers (LTCs) (where applicable), and coil reclamping. The goal of this guide is to assist the user in extending the useful life of a transformer. Keywords: evaluation, life extension, reconditio
7、ning, risk assessment _ The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2007 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 27 April 2007. Printed in the United States of America. IEEE is
8、 a registered trademark in the U.S. Patent +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS und
9、er license with IEEELicensee=IHS Employees/1111111001, User=Gearhard, Marcus Not for Resale, 06/01/2007 01:51:05 MDTNo reproduction or networking permitted without license from IHS -,-,- Introduction This introduction is not part of IEEE Std C57.140-2006, IEEE Guide for the Evaluation and Reconditio
10、ning of Liquid Immersed Power Transformers. At the turn of the century, approximately one half of all transformers used in the electric utility industry reached their 30 yr design life. Because of todays economics, many of these transformers will be called upon to supply reliable service for an addi
11、tional 20 yr to 30 yr. Any transformer owner intending to significantly extend the life should address three key areas: economics, inspection and diagnostics, and materials and design. A comprehensive economic study should be carried out before the investment of significant resources. This study inv
12、olves load forecasts, reserve margins, new capacity plans, cost-benefit analyses, operating costs, capital costs, and continued reliability and availability. Once a financial decision to extend the transformer life is made, an inspection and diagnostic strategy should be determined. This evaluation
13、should include the following: manufacturer, size, age, operating history, thermal load, electrical tests, maintenance history, and failure history. New materials, major component replacement, and other design changes may also affect the life extension decision. The development of better core steel a
14、nd better solid insulation has been ongoing for a number of years. The better operating efficiency of new materials may make life extension uneconomical. Notice to users Errata Errata, if any, for this and all other standards can be accessed at the following URL: http:/ standards.ieee.org/reading/ie
15、ee/updates/errata/index.html. Users are encouraged to check this URL for errata periodically. Interpretations Current interpretations can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/ index.html. Patents Attention is called to the possibility that implementation of
16、this guide may require use of subject matter covered by patent rights. By publication of this guide, no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying patents or patent applications for which
17、 a license may be required to implement an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. iv Copyright 2007 IEEE All rights reserved Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS u
18、nder license with IEEELicensee=IHS Employees/1111111001, User=Gearhard, Marcus Not for Resale, 06/01/2007 01:51:05 MDTNo reproduction or networking permitted without license from IHS -,-,- Participants This guide was prepared by the Guide for the Evaluation and Reconditioning of Liquid Immersed Powe
19、r Transformers Working Group, with guidance from the Power Transformer Subcommittee. At the time this guide was completed, the working group had the following membership: Rowland James, Chair William Bartley, Co-Chair however, copies can be obtained from Global Engineering, 15 Inverness Way East, En
20、glewood, CO 80112-5704, USA (http:/ 7 Numbers in brackets correspond to the numbers in the bibliography in Annex A. 2 Copyright 2007 IEEE All rights reserved Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001
21、, User=Gearhard, Marcus Not for Resale, 06/01/2007 01:51:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C57.140-2006 IEEE Guide for the Evaluation and Reconditioning of Liquid Immersed Power Transformers 3.1.2 furanic compound: A family of molecules created by
22、the thermal degradation of cellulose. Furanic compounds are derived from a heterocyclic five-member hydrocarbon that includes oxygen and two double bonds. 3.1.3 gas chromatography: A process in which the material sample is vaporized and injected into a stream of carrier gas (as nitrogen or helium) m
23、oving through a column containing a stationary phase composed of a liquid or particulate solid. The material is then separated into its component compounds according to their affinity for the stationary phase. 3.1.4 static electrification (oil-immersed transformers): A surface charge imbalance cause
24、d by solid insulation in contact with flowing oil. This imbalance results in a charge accumulation in oil that increases potential-producing electrical discharge. 3.2. Acronyms and abbreviations BIL basic impulse level DETC deenergized tap changer DGA dissolved gas analysis DP degree of polymerizati
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