1、 1ANSI/IEEE C37.18-1979(R2003)An American National StandardIEEE Standard Enclosed Field Discharge Circuit Breakers for Rotating Electric MachinerySponsorSwitchgear Committeeof theIEEE Power Engineering SocietySecretariatInstitute of Electrical and Electronics EngineersNationalElectrical Manufacturer
2、s AssociationApproved December 9, 1976Reaffirmed March 22, 1984Reaffirmed March 21, 1991Reaffirmed June 12, 2003IEEE Standards BoardApproved February 15, 1979Reaffirmed June 30, 1986Reaffirmed August 6, 1991American National Standards InstitutePublished byInstitute of Electrical and Electronics Engi
3、neers, Inc345 East 47th Street, New York, NY 10017iiAmerican National StandardAn American National Standard implies a consensus of those substantially concerned with its scope and provisions.An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general p
4、ublic.The existence of an American National Standard does not in any respect preclude anyone, whether he has approved thestandard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures notconforming to the standard. American National Standards are subject to p
5、eriodic review and users are cautioned toobtain the latest editions.CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures ofthe American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard nolater
6、than five years from the date of publication. Purchasers of American National Standards may receive currentinformation on all standards by calling or writing the American National Standards Institute.Copyright 1980 byThe Institute of Electrical and Electronics Engineers, IncNo part of this publicati
7、on may be reproduced in any form, in an electronic retrieval system or otherwise, without theprior written permission of the publisher.iiiForeword(This Foreword is not a part of ANSI/IEEE C37.18-1979, American National Standard Enclosed Field Discharge Circuit Breakersfor Rotating Electric Machinery
8、)This standard was first published in 1962 as IEEE Publication No 90 for trial use. It was also published as NEMAStdSG3-1965, Low-Voltage Power. After a period of industry use the material was reviewed and revised andpublished as USA Std 37.18-1968 (R1975), Requirements for Field Discharge Circuit
9、Breakers for Rotating ElectricMachinery, and USA Std C37.16a-1968, Supplement to USA Std C37.16-1963, Preferred Ratings and RelatedRequirements for Low-Voltage Power Circuit Breakers. This revision of the material, ANSI/IEEE C37.18-1979,which replaces ANSI C37.18-1968, was developed by the IEEE Work
10、ing Group of the Low-Voltage SwitchgearDevices Subcommittee.The major revisions which have been made in updating this standard to reflect the changing state of the art are theaddition of material concerned with solid-state sources of excitation and additional ratings. The preferred ratings andrelate
11、d requirements are still contained in Tables 7, 7A, and 14 of ANSI C37.16-1979, Preferred Ratings, RelatedRequirements, and Application Recommendations for Low-Voltage Power Circuit Breakers and AC Power CircuitProtectors (revision and consolidation of C37.15-1954 and C37.16-1970); although Section
12、7, Test Procedures, andSection 9, Application have been extensively revised to reflect present day requirements.This publication represents standard practice in the United States relating to field discharge circuit breakers for use infield circuits of rotating electric machinery such as generators,
13、motors, synchronous condensers, or exciters. AmericanNational Standards covering additional requirements are: ANSI C37.16-1979; Switchgear Assemblies, IncludingMetal-Enclosed Bus, ANSI/IEEE C37.20-1969, Definitions for Power Switchgear, ANSI C37.100-1972 (IEC 50-16)(IEC 277); Standard Techniques for
14、 High-Voltage Testing, IEEE Std 4-1978, (IEC 52).Molded-case circuit breakers are covered by other standards but in some instances may be able to meet therequirements of this standard.The Standards Committee on Power Switchgear, C37, which reviewed and approved this standard, had the followingperson
15、nel at the time of approval:C. L. Wagner, Chair J. P. Lucas, Secretary J. E. Beehler (Executive Vice-Chairman of High Voltage Switchgear Standards)W. E. Laubach (Executive Vice-Chairman of Low Voltage Switchgear Standards)S. H. Telander (Executive Vice-Chairman of IEC Activities)Organization Represe
16、nted Name of RepresentativeAssociation of American Railroads VacantAssociation of Iron and Steel Engineers J. M. TillmanElectric Light and Power Group. K. G. AdgateJ. E. BeehlerR. L. Capra (Alt)H. G. DarronH. F. FrusK. D. HendrixR. L. Lindsey (Alt)E. E. Ramm (Alt)F. R. SolisivThe Working Group of th
17、e IEEE Low-Voltage Switchgear Devices Subcommittee responsible for the current revivsionare:M. B. Fornwalt, Chair H. H. Connelley, Secretary R. J. AltonL. L. BairdJ. M. ClarkM. L. CrenshawR. E. GormanW. J. LordeonR. A. McMasterThe members of the IEEE Low-Voltage Switchgear Devices Subcommittee who r
18、eviewed and approved this standardare:R. N. Bell, Chair H. H. Connelley, Secretary R. J. AltonL. L. BairdA. N. EliasenW. H. FergusonE. J. HuberJ. J. KomiskyR. A. McMasterW. A. MathewsV. A. MortensonF. J. ShieldsJ. StewartJ. R. TruittJ. P. WernerInstitute of Electrical and Electronics Engineers . M.
19、J. Beachy (Alt)R. N. Bell (Alt)H. H. FahnoeR. E. FriedrichM. J. MaierC. A. Mathews (Alt)D. C. Musgrave (Alt)G. W. WalshH. F. WhiteNational Electrical Manufacturers Association A. P. ColaiacoR. W. DunhamD. G. PortmanG. A. WilsonW. R. WilsonTennessee Valley Authority . Robert C. St. ClairTesting Labor
20、atory Group L. FrierE. J. HuberR. W. Seelbach (Alt)U.S. Department of the Army Robert H. BruckU.S. Department of the Interior Bureau of Reclamation Edward M. TomsicU.S. Department of Defense, Defense Communications Agency VacantU.S. Department of the Navy, Naval Facilities Engineering Command D. M.
21、HannemannOrganization Represented Name of RepresentativevWhen this standard was approved December 9, 1976, the IEEE Standards Board had the following membership:William R. Kruesi, Chair Irvin N. Howell, Jr, Vice Chair Ivan G. Easton, Secretary William E. AndrusJean Jacques ArchambaultDale R. Cochran
22、Warren H. CookLouis CostrellJay ForsterJoseph L. KoepfingerIrving KolodnyBenjamin J. LeonAnthony C. LordiJohn P. MarkeyThomas J. MartinDonald T. MichaelVoss A. MooreWilliam S. MorganWilliam J. NeiswenderGustave ShapiroRalph M. ShowersRobert A. SodermanLeonard W. Thomas, SrCharles L. WagnerWilliam T.
23、 WintringhamDeceasedviCLAUSE PAGE1. Scope.12. Definitions.23. Service Conditions 24. Ratings 34.1 Rating Information. 34.2 Rated Nominal Voltage Class 44.3 Rated Short-Time Voltage . 44.4 Rated Maximum Interrupting Voltage. 44.5 Rated Continuous Current 44.6 Short-Time Current Ratings. 54.7 Interrup
24、ting Current Ratings 54.8 Rated Making Current of the Discharge Contacts . 64.9 Rated Control Voltage . 65. Functional Components 65.1 Nameplate(s) 75.2 Contact Position Indicator 75.3 Stored Energy Indicator . 76. Temperature Limitations and Classification of Insulating Materials76.1 Temperature Li
25、mits 76.2 Limits of Observable Temperature Rise 86.3 Classification of Insulating Materials 87. Insulation (Dielectric) Withstand Voltage Requirements.97.1 Field Discharge Circuit Breakers. 97.2 Dielectric Test Procedures and Method of Voltage Measurement 98. Test Requirements.108.1 Classification o
26、f Tests 108.2 Design Tests. 108.3 Production Tests. 159. Application Guide .169.1 General. 169.2 Functions Performed by a Field Discharge Circuit Breaker 179.3 Selection of Field Discharge Resistor 199.4 Selection of Field Discharge Circuit Breaker 2010. Revision of American National Standards Refer
27、red to in this Standard.24Copyright 1980 IEEE All Rights Reserved1An American National StandardIEEE Standard Enclosed Field Discharge Circuit Breakers for Rotating Electric Machinery1. ScopeThis standard applies to all low-voltage power-circuit breakers that are intended for use in field circuits of
28、 apparatussuch as generators, motors, synchronous condensers, or exciters and embodying contacts for establishing fielddischarge circuits.NOTE In this standard, the use of the term “circuit breaker” shall be considered to mean “field discharge circuit breaker usedin enclosures for rotating electric
29、machinery.”In performing their function of interrupting field circuits of rotating electric machinery, field discharge circuit breakersare subject to the following conditions not met within the interruption of ordinary direct-current power circuits.1) In alternating-current machine field circuits, i
30、n addition to the problems usually encountered in switchinghighly inductive direct-current circuits, there is superimposed upon the voltage generated by the exciter, avoltage induced in the field windings by the transient current in the machine armature under alternating-currentshort-circuit conditi
31、ons. These result in large pulsating currents in the field circuit as illustrated in Fig 1.2) Due to the large amount of magnetic energy stored in the machine field circuit, the interruption of the circuitresults in an unusually high transient voltage under alternating-current short-circuit conditio
32、ns, unless specialmeans are provided for dissipating the energy.3) A discharge resistor must be connected across the terminals of the machine field by the discharge contacts ofthe circuit breaker just prior to disconnecting the field from its excitation source in order to provide fordissipation of t
33、he stored energy of the machine field and to minimize the transient voltage. The voltage acrossthe field discharge circuit breaker main contacts following interruption of the excitation source current isillustrated in Fig 2.4) In addition to the above conditions, there is the usual direct-current sh
34、ort-circuit condition wherein the fieldcircuit may become short-circuited.To cope with these unique conditions, this standard for field discharge breakers has been developed to establish therating structure and test requirements not encountered in other ANSI Standards1which apply to other low-voltag
35、ecircuit breakers.The dielectric test values given in Table 7A, ANSI C37.16-1979, Preferred Ratings, Related Requirements, andApplication Recommendations for Low-Voltage Power Circuit Breakers and AC Power Circuit Protectors, reflect thechange in dielectric test requirements in ANSI C50.13-1977 Requ
36、irements for Cylindrical Rotor SynchronousGenerators.1American National Standards are available front the American National Standards Institute, 1430 Broadway, New York, N.Y. 10018.2 Copyright 1980 IEEE All Rights ReservedANSI/IEEE C37.18-1979 IEEE STANDARD ENCLOSED FIELD DISCHARGE2. DefinitionsThe
37、definitions of terms in this standard, or in other ANSI Standards referred to in this document, are not intended toembrace all legitimate meanings of the terms. They are applicable only to the subject treated in this standard.For additional definitions, see ANSI C37.100-1972, Definitions for Power S
38、witchgear and IEEE Std 421-1972,Criteria and Definitions for Excitation Systems for Synchronous Machines.circuit breaker, field discharge: A circuit breaker having main contacts for energizing and deenergizing the field ofa generator, motor, synchronous condenser, or rotating exciter, and having dis
39、charge contacts for short-circuiting thefield through the discharge resistor at the instant preceding the opening of the circuit breaker main contacts. Thedischarge contacts also disconnect the field from the discharge resistor at the instant following the closing of the maincontacts. For direct-cur
40、rent generator operation, the discharge contacts may open before the main contacts close.2NOTE When used in the main field circuit of an alternating or direct-current generator, motor, or synchronous condenser, thecircuit breaker is designated as a main field discharge circuit breaker. When used in
41、the field circuit of the rotating exciterof the main machine, the circuit breaker is designated as an exciter field discharge circuit breaker.voltage class, rated nominal: The voltage to which operating and performance characteristics are referred.3voltage, exciter-ceiling: The maximum voltage that
42、may be attained by an exciter under specifield conditions.3voltage, rated maximum interrupting of main contacts: The maximum dc voltage, including voltage induced in themachine field by current in the machine armature, at which the field discharge circuit breaker main contacts arerequired to interru
43、pt the excitation source current. The magnitude of the dc component of the total voltage across themain contacts is equal to the displacement of the axis.3 (See Fig 2 for illustration of the direct component of voltageunder 3-phase fault conditions.)voltage, rated short-time of main contacts: The hi
44、ghest dc voltage at which the circuit breaker main contacts shallbe required to interrupt exciter short-circuit currents.33. Service ConditionsA circuit breaker conforming to this standard shall be suitable for operation up to and including all of its standardratings, providing that:1) The temperatu
45、re of the air surrounding the circuit breaker is not below 5C NOTE When properly applied in metal-enclosed power switchgear or individual enclosures, a circuit breaker willoperate within the limits of ambient temperature of the air surrounding the enclosure as specified in ANSI/IEEE C37.20-1969, Swi
46、tchgear Assemblies Including Metal-Enclosed Bus (1974 consolidated edition).2) The altitude does not exceed 2000 m (6600 ft)3) The relative humidity of the air surrounding the circuit breaker is such that there will be no condensation onthe circuit breaker parts at any time4) None of the service con
47、ditions listed in 9.4.8.2 prevail.Whenever the service conditions depart from those defined in this section, consultation between the user andmanufacturer is recommended. Some of the service conditions which may require additional attention are listed in9.4.8.2This definition differs from that appea
48、ring in ANSI C37.100-1972.3At the time this standard was approved, there was no corresponding definition in ANSI C37.100-1972.Copyright 1980 IEEE All Rights Reserved 3CIRCUIT BREAKERS FOR ROTATING ELECTRIC MACHINERY ANSI/IEEE C37.18-19794. Ratings4.1 Rating InformationThe rating of field discharge c
49、ircuit breakers is a designated limit of operating characteristics based upon serviceconditions in Section 3 and shall include the following as applicable:1) Rated nominal voltage class2) Rated short-time voltage of main contacts3) Rated maximum interrupting voltage of main contacts4) Rated continuous current of main contacts5) Rated interrupting current of main contacts at rated short-time voltage6) Rated interrupting current of main contacts at rated maximum interrupting voltage7) Rated interrupting current of the discharge contacts at rated nominal voltage8) Rated
