【ieee国际电工】ieee std 5221992 guide for testing turntoturn insulation on formwound stator coils for alternatingcurrent rotating electric machines.doc

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1、Recognized as an IEEE Std 522-1992American National Standard (ANSI) (Revision of IEEE Std 522-1977)IEEE Guide for Testing Turn-to-Turn Insulation on Form-Wound Stator Coils for Alternating-Current Rotating Electric MachinesSponsorElectric Machinery Committee of theIEEE Power Engineering SocietyAppro

2、ved June 18, 1992IEEE Standards BoardApproved January 4, 1993American National Standards InstituteAbstract: Suggestions are made for testing the dielectric strength of the insulation separat- ing the various turns from each other within multiturn form-wound coils to determine their acceptability. Ty

3、pical ratings of machines employing such coils normally lie within the range of 200 kW to 100 MW. The test voltage levels described do not evaluate the ability of the turn insulation to withstand abnormal voltage surges, as contrasted to surges associated with nor- mal operation. The suggestions app

4、ly to: (1) individual stator coils after manufacture; (2) coils in completely wound stators of original manufacture; (3) coils and windings for rewinds of used machinery; and (4) windings of machines in service to determine their suitability for fur- ther service (preventive-maintenance testing). Co

5、il service conditions, test devices, and test sequence are discussed. High-frequency test levels for new coils during winding, and for applying surge tests to complete windings, are given.Keywords: ac machines, power system transients, rotating-machine insulation testingThe Institute of Electrical a

6、nd Electronics Engineers, Inc.345 East 47th Street, New York, NY 10017-2394, USACopyright 1992 by theInstitute of Electrical and Electronics Engineers, Inc.All rights reserved. Published 1992Printed in the United States of AmericaISBN 1-55937-252-4No part of this publication may be reproduced in any

7、 form, in an electronic retrieval system or otherwise,without the prior written permission of the publisher.IEEE Standards documents are developed within the Technical Com- mittees of the IEEE Societies and the Standards Coordinating Commit- tees of the IEEE Standards Board. Members of the committee

8、s serve voluntarily and without compensation. They are not necessarily members of the Institute. The standards developed within IEEE represent a con- sensus of the broad expertise on the subject within the Institute as well as those activities outside of IEEE that have expressed an interest in parti

9、c- ipating in the development of the standard.Use of an IEEE Standard is wholly voluntary. The existence of an IEEE Standard does not imply that there are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE Standard. Further

10、more, the viewpoint expressed at the time a standard is approved and issued is subject to change brought about through developments in the state of the art and comments received from users of the standard. Every IEEE Standard is subjected to review at least every five years for revision or reaffirma

11、tion. When a docu- ment is more than five years old and has not been reaffirmed, it is reason- able to conclude that its contents, although still of some value, do not wholly reflect the present state of the art. Users are cautioned to check to determine that they have the latest edition of any IEEE

12、 Standard.Comments for revision of IEEE Standards are welcome from any inter- ested party, regardless of membership affiliation with IEEE. Suggestions for changes in documents should be in the form of a proposed change of text, together with appropriate supporting comments.Interpretations: Occasiona

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15、where the matter has previously received formal consideration.Comments on standards and requests for interpretations should be addressed to:Secretary, IEEE Standards Board445 Hoes LaneP.O. Box 1331Piscataway, NJ 08855-1331USAIEEE Standards documents are adopted by the Institute of Electrical and Ele

16、ctronics Engineers without regard to whether their adoption may involve patents on articles, materials, or processes. Such adoption does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the standards documents.Foreword(This foreword is not

17、a part of IEEE Std 522-1992, IEEE Guide for Testing Turn-to-Turn Insulation on Form- Wound Stator Coils for Alternating-Current Rotating Electric Machines.)This revision of IEEE Std 522-1977 was initiated by the Insulation Subcommittee (now Materials Subcommittee) of the Rotating Machinery Committee

18、 of the IEEE Power Engineer- ing Society. At the time that this standard was completed, the working group had the follow- ing membership:Bal K. Gupta, ChairD. ArndtT. KlukE. L. OwenN.K. GhaiA. KoutsoukosR. RehderC. HeisingS. LindholmD. E. SchumpK. HenryT. J. LorenzR. L. ShultzT. A. HigginsF. Lotte,

19、Jr.G. C. StoneD. W. JacksonJ. de MarcoT. R. WaiteL. F. KlataskeP. MlynarC. A. WilsonN. E. NilssonAt the time that it balloted and approved this standard for submission to the IEEE Stan- dards Board, the Materials Subcommittee had the following membership:E. J. AdolpsonF. H. GroomsG. H. MillerP. E. A

20、lexanderB. K. GuptaO. M. NassarD. ArndtR. A. HuberR. H. RehderR. L. BalkeA. M. IversenC. M. RoweW. H. BentleyT. B. JenkinsD. E. SchumpE. A. BoulterL. F. KlataskeR. F. SharrowL. E. Braswell, IIIT. M. KlukR. L. SchultzL. W. BuchananS. LindholmW. G. StifflerA. W. W. CameronT. J. LorenzG. C. StoneJ. L.

21、CohonC. Y. LuJ. E. TimperlyJ.L. EmeryB. MayschakR. F. WeddletonR. J. FlahertyR. J. McGrathC. A. WilsonN. K. GhaiM. ZgraggenWhen the IEEE Standards Board approved this standard on June 18, 1992, it had the fol- lowing membership:Marco W. Migliaro, ChairDonald C. Loughry, Vice ChairAndrew G. Salem, Se

22、cretaryDennis BodsonDonald N. HeirmanT. Don Michael*Paul L. BorrillBen C. JohnsonJohn L. RankineClyde CampWalter J. KarplusWallace S. ReadDonald C. FleckensteinIvor N. KnightRonald H. ReimerJay Forster*Joseph Koepfinger*Gary S. RobinsonDavid F. FranklinIrving KolodnyMartin SchneiderRamiro GarciaD. N

23、. “Jim” LogothetisTerrance R. WhittemoreThomas L. Hannan*Member EmeritusLawrence V. McCallDonald W. ZipseAlso included are the following nonvoting IEEE Standards Board liaisons:Satish K. AggarwalJames BeallRichard B. Engelman David E. Soffrin Stanley WarshawTheresa ArgiropoulosIEEE Standards Project

24、 EditorContentsSECTION PAGE1. Introduction . 12. Scope and Reference . 13. Service Conditions. 24. Suggested Test Devices. 25. Test Sequence. 36. High-Frequency Test Levels for New Coils . 37. Maintenance Tests or Tests After Installation of Machines. 48. Bibliography . 5FIGURESFig 1 Coil Electrical

25、 Impulse Voltage Withstand Envelope . 3Fig 2 Alternative Coil Impulse Voltage Withstand Envelope . 4APPENDIXESAppendix ATest Procedures and Methods . 9Appendix B Sample Test Form . 14APPENDIX FIGURESFig A1 Surge-Inducing Coil . 10Fig A2 Suggested Arrangement of Test Equipment . 10Fig A3 Voltage Wave

26、form for Short-Circuited and Normal Coils Using Induced-Voltage Test Method . 12Fig A4 Waveforms of Short-Circuited and Normal Coils Tested DirectlyConnected, in the Iron. 12Fig A5 Schematic Circuit for Marx Generator . 13IEEE Guide for Testing Turn-to-Turn Insulation on Form-Wound Stator Coils for

27、Alternating-Current Rotating Electric Machines1. Introduction1.1 Many alternating-current rotating electric machines are designed to have multiturn form- wound stator coils. In these cases, the winding has two separate but interrelated insulating barriers:(1) between the various turns (turn insulati

28、on)(2) between the turns and ground (ground insulation)Failure of either of these barriers will prematurely terminate the service life of the machine. A test level, twice rated voltage plus 1 kV, for the ground insulation has been in existence for many years. This guide suggests methods and test lev

29、els for the turn insulation. Experience has shown that turn-insulation failures can be precipitated by abnormal steep- front surges caused by factors such as lightning strokes, faulty breaker closures, or the mal- function of various types of switching devices. However, turn-insulation failures can

30、also be caused by surges during normal breaker operations when the circuit conditions are such that the rise time of the surge at the machine terminals is less than a few microseconds. A measure of protection from such surges may be provided by installation of devices such as wave-sloping capacitors

31、 at the machine terminals and surge arrestors, or by increasing turn-to-turn insula- tion. When used for this purpose, capacitor ratings are usually chosen to extend the rise time of voltage surges to 5 s or longer. References are given for determining surge environment and strength of electric mach

32、ines in the Bibliography (Section 8).2. Scope and Reference Scope. The purpose of this guide is to make suggestions on testing the dielectric strength of the insulation separating the various turns from each other within multiturn form-wound coils to determine the acceptability of the coils. Typical

33、 ratings of machines employing such coils normally lie within the range of 200 kW to 100 MW. Test voltage levels described herein do not evaluate the ability of the turn insulation to withstand abnormal voltage surges, as contrasted to surges associated with normal operation. These suggestions apply

34、 to:(1) Individual stator coils after manufacture(2) Coils in completely wound stators of original manufacture(3) Coils and windings for rewinds of used machinery(4) Windings of machines in service to determine their suitability for further service (pre- ventive-maintenance testing)IEEEStd 522-1992I

35、EEE GUIDE FOR TESTING TURN-TO-TURN INSULATION ON FORM-WOUND Reference. This guide shall be used in conjunction with the following publication:1 IEEE Std 43-1974 (1991), IEEE Recommended Practice for Testing Insulation Resistance of Rotating Machinery (ANSI).13. Service Conditions3.1. The maximum ope

36、rating (line frequency) voltage difference between turns in a coil depends upon the voltage between coil terminals and the internal construction of the coil.3.2. A second and less predictable voltage difference between turns can be caused by tran- sients. Additional information on the nature of such

37、 transients and the associated turn volt- age distribution may be found in a number of articles cited in the Bibliography. Steep-front waves due to arcing in the associated circuit can be damaging to turn insulation since a sub- stantial portion of the wave can appear across the turn insulation of t

38、he coils near the line ter- minals.The voltage difference that turn insulation must withstand, therefore, covers a broad range from less than 100 V in normal operation to as much as several thousand volts under tran- sient conditions. At the one end of this range, all that is needed is physical sepa

39、ration; whereas at the other, insulation having considerable dielectric strength is desirable.4. Suggested Test Devices4.1. Individual form-wound multiturn coils have a low series impedance at power frequencies, particularly so prior to insertion in the stator core. Because of this, connection acros

40、s the leads of any power-frequency test source of adequate voltage to test the insulation will result in high current. This, of course, will also be the case with dc and very-low frequency sources. Therefore, to apply a voltage of reasonable magnitude across the coil leads without excessive current,

41、 a test voltage having an equivalent frequency several orders of magnitude above power frequency would be desirable (examples are given in Appendix A, A1.2).4.2. A suitable testing device should provide voltage control, accurate indication of voltage level, and a means of detecting turn-to-turn insulation failure. A single-stage “Marx” genera- tor with a storage oscilloscope is an example of such a device. A schematic diagram of the gen- erator is given in the Appendix. Both conduction- and induction-type testing device