IEEE-502-1985-R1998.pdf

IEEE Std 502-1985 IEEE Guide for Protection, Interlocking, and Control of Fossil-Fueled Unit- Connected Steam Stations Sponsor Power Generation Committee of the IEEE Power Engineering Society Approved 22 September 1983 IEEE Standards Board © Copyright 1985 by The Institute of Electrical and Electronics Engineers, Inc 345 East 47th Street, New York NY 10017, USA No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Standards documents are developed within the Technical Committees of the IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Board. 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Since IEEE Standards represent a consensus of all concerned interests, it is important to ensure that any interpretation has also received the concurrence of a balance of interests. For this reason IEEE and the members of its technical committees are not able to provide an instant response to interpretation requests except in those cases where the matter has previously received formal consideration. Comments on standards and requests for interpretations should be addressed to: Secretary, IEEE Standards Board 345 East 47th Street New York, NY 10017 USA Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Foreword (This Foreword is not a part of IEEE Std 502-1985, IEEE Guide for Protection, Interlocking, and Control of Fossil-Fueled Unit- Connected Steam Stations.) The introduction to protection, interlocking, and control for a fossil-fueled plant is written to furnish information which will help Þll a need that exists within the industry to promote the use of sound engineering practices to provide a coordinated design for the protection, interlocking, and control of unit-connected boiler-turbine generators power plants. It covers what is good practice at the time of publication, but it is not intended to be a handbook of design practices. It is impractical to cover in detail all of the varied aspects of protection, interlocking, and control since there are a great number of different types of plants and equipment. It should be remembered that the information presented here is typical of that available to provide protection to personnel and safeguard equipment against catastrophic damage which may result from equipment failure, inadvertent errors, or misoperations. The system diagrams and logic diagrams are only representative and do not depict all of the system design features or protective features required for any speciÞc application. The diagrams are intended to suggest the design areas to be covered by the speciÞc unit design and cannot replace a competently prepared design which meets the unique requirements of the speciÞc generating unit. The material presented shall not be used by inexperienced personnel as a substitute for engineering competence. The IEEE Standards Manual describes a guide as follows: documents in which alternative approaches to good practice are suggested, but no clear recommendations are made. The information in this guide was Þrst developed by the working group and paper presented as a Þve-part series and published in IEEE Transactions on Power Apparatus and Systems , vol PAS-92, no 1, pp 314Ð401. The furnace air and fuel comments are in accordance with the National Fire Protection Association recommendations on gas, oil, and coal boiler operation. This publication is intended to be in accordance with NFPA recommendations, NFPA 85 Series. Members of the working group responsible for this guide are as follows: K. L. West , Chair R. S. Bilski R. E. Drake L. E. Ettlinger M. E. Jackowski R. G. Livingston G. L. Luri P. L. McGaha B. J. Stables R. E. Strasser A. J. Zadiraka Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- iv At the time this guide was approved, the members of the Power Plant Control, Protection and Automation Subcommittee were: T. D. Younkins , Chair A. T. Baker R. S. Bilski G. C. Boyle R. L. Castleberry E. F. Chelotti C. H. Clarridge D. Damsker R. S. Darke P. M. Davidson A. C. Dolbec V. F. Estcourt M. Ewer A. H. Ferber R. J. Fleming D. C. Garvey A. Gross M. E. Jackowski H. M. Jimenez C. Kneeburg G. Luri R. E. Mattson T. J. McGrath W. S. Morgan E. B. Nobile M. I. Olken W. S. Pearce N. Petroro R. J. Reiman T. Russell W. J. Spengel A. J. Spurgin R. B. Squires V. D. Thomas D. Tondi W. H. von Kleinsmid K. L. West J. P. Whooley At the time this guide was approved, the members of Power Generation Committee of the IEEE Power Engineering Society were: R. Zweigler , Chair D. Diamant , Vice Chair R. W. Cantrell , Secretary J. C. Appiarius W. W. Avril M. S. Baldwin J. H. Bellack I. B. Berezowsky G. Berman F. L. Brennan G. C. Boyle P. G. Brown E. F. Chelotti H. E. Church, Jr C. H. Clarridge R. S. Colemen R. E. Cotta M. L. Crenshaw R. S. Darke P. Davidson A. C. Dolbec G. R. Engman W. H. Esselman V. F. Estcourt T. F. Faulkner W. M. Fenner A. H. Ferber D. I. Gorden R. D. Handel J. J. Heagerty M. E. Jackowski E. F. Kaprielian F. Keay P. R. Landrieu S. Law P. Lewis H. E. Lokay G. L. Luri J. T. Madill J. D. Mather O. S. Mazzoni A. J. McElroy T. M. McMahon J. L. Mills W. S. Morgan P. A. Nevins S. Nikolakakos J. T. Nikolas R. E. Penn J. D. Plaxco R. J. Reiman D. E. Roberts W. J. Rom R. G. Scott J. J. Seibert M. N. Sprouse A. J. Spurgin R. B. Squires J. V. Stephens G. I. Stillman J. E. Stoner, Jr V. C. Sulzberger S. Tjepkema R. H. Waltman E. J. Warchol M. Warren K. L. West J. P. Whooley R. F. Willett C. J. Wylie T. D. Younkins Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- v When the IEEE Standards Board approved this standard on September 22, 1983, it had the following membership: James H. Beall , Chair Edward Chelotti , Vice Chair Sava I. Sherr , Secretary J. J. Archambault John T. Boettger J. V. Bonucchi Rene Castenschiold Edward J. Cohen Len S. Corey Donald C. Fleckenstein Jay Forster Donald N. Heirman Irvin N. Howell, Jr. Joseph L. Koepfinger* Irving Kolodny George Konomos R. F. Lawrence John E. May Donald T. Michael* John P. Riganati Frank L. Rose Robert W. Seelbach Jay A. Stewart Clifford O. Swanson Robert E. Weiler W. B. Wilkens Charles J. Wylie *Member emeritus Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- vi CLAUSEPAGE 1. Scope and References .1 1.1 Scope 1 1.2 References 1 2. Introduction.2 3. Plant Auxiliaries in Service.4 4. Circulating Water Cycle5 5. Service Water Cycle7 6. Condensate and Feedwater System.8 7. Boiler Water11 7.1 Drum Boiler . 12 7.2 Once-Through Boiler. 14 8. Furnace Air and Fuel System19 8.1 19 8.2 20 8.3 22 8.4 22 9. Turbine-Generator.23 9.1 Turning Gear Operation. 24 9.2 Steam Seal System. 25 9.3 Vacuum Operation. 26 9.4 Oil and Hydraulic Fluid Systems. 27 9.5 Turbine Rotor Prewarming 28 9.6 Valve Trip Testing. 28 9.7 Turbine Preroll. 29 9.8 Turbine Roll. 29 10. Overall Protection.33 10.1 Boiler Protection 34 10.2 Turbine Protection 36 10.3 Generator Protection 38 10.4 Main and Auxiliary Transformers 39 10.5 Auxiliary System 40 10.6 Emergency Power 40 11. Summary of Unit Overall Protection41 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright © 1985 IEEE All Rights Reserved 1 IEEE Guide for Protection, Interlocking, and Control of Fossil-Fueled Unit- Connected Steam Stations 1. Scope and References 1.1 Scope This guide presents information regarding the essential subsystems that make up a fossil-fueled unit-connected boiler-turbine-generator (BTG) station and describes typical interlocking, control, and protection for operating them in a coordinated order to ensure proper start-up and safe shutdown. The primary purpose of this guide is to provide a basis for 1)Qualitative evaluating of overall design of a unit-connected fossil fuel plant 2)Writing general operating guides of an educational nature, thereby serving to aid in acquainting personnel with boiler-turbine-generator systems. Every new fossil plant will have its own special operating sequence due to the type of equipment installed and its operating companyÕs practices. However, this guide purports to include in one document a description of various cycles in a power plant, their sequence of operation, and protection procedures. The information contained in this guide should be coordinated with manufacturersÕ recommendations to establish individual plant designs. 1.2 References 1 ANSI/NFPA 85A-1982, Furnace Explosions in Fuel Oil- and Natural Gas-Fired Single-Burner Boiler-Furnaces. 1 2 ANSI/NFPA 85B-1978, Gas-Fired Multiple Burner Boiler-Furnaces, Explosion Prevention. 3 ANSI/NFPA 85D-1978, Fuel Oil-Fired Multiple Burner Boiler-Furnaces, Explosion Prevention. 4 ANSI/NFPA 85E-1980, Pulverized Coal-Fired Multiple Burner Boiler-Furnaces, Explosion Prevention. 1 NFPA documents are published by the National Fire Protection Association, Publications Sales Division, Batterymarch Park, Quincy, MA 02269. Copies are also available from the Sales Department of American National Standards Institute, 1430 Broadway, New York, NY 10018. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 Copyright © 1985 IEEE All Rights Reserved IEEE Std 502-1985IEEE GUIDE FOR PROTECTION, INTERLOCKING, AND CONTROL 5 ANSI/NFPA 85G-1982, Prevention of Furnace Implosions in Multiple Burner Boiler-Furnaces. 6 ASME Boiler and Pressure Vessel Code. 2 7 NFPA 85F-1982, Pulverized Fuel Systems, Installation and Operation. 2. Introduction The text material, simpliÞed ßow diagrams, and logic diagrams are presented in the proper sequence for start-up of a fossil-fueled boiler-turbine-generator unit. Section 10. describes overall protection of the systems, and Section 11. is a table which summarizes and supplements the guide material. Figure 1 shows a simpliÞed combined systems diagram in logic form. Figure 1ÑCombined Systems Diagrams 2 ASME documents are available from the American Society of Mechanical Engineers, 345 East 47th Street, New York, NY 10017. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright © 1985 IEEE All Rights Reserved 3 OF FOSSIL-FUELED UNIT-CONNECTED STEAM STATIONSIEEE Std 502-1985 Figure 2 shows a simpliÞed arrangement of the major elements of a boiler-turbine-generator unit. Figure 2ÑSimplified Arrangement: Boiler-Turbine-Generator Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:51:27 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 Copyright © 1985 IEEE All Rights Reserved IEEE Std 502-1985IEEE GUIDE FOR PROTECTION, INTERLOCKING, AND CONTROL The logic symbols used are as follows: The NOTES following the ßow diagrams and the logic diagrams supplement the diagrams and differentiate between them. Corresponding reference numbers appear on the diagrams only where required for clarity. 3. Plant Auxiliaries in Service Plant auxiliaries in service refers to the many plant subloops which shall be started and run prior to starting the main systems. These include electrical control (direct and alternating current), auxi