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1、CORRECTION American National Standard Requirements for Ventilated Dry-Type Distribution Transformers, 1 t o 500 kVA, Single-phase, and 15 t o 500 kVA, Three-phase, with High-Voltage 601 to 34 500 Volts, Low-Voltage 120 t o 600 Volts, ANSI C57.12.50-1981 In Table 4 on page 9, replace the f i r s t s
2、i x lines by the following: 2 400- 4 160Y* 4 160/ 7 200Y* 6 900 7 200 4 800/ 8 320Y* 6 930/12 OOOY* June 1982 30 30 30 30 45 60 12 12 12 12 19 31 o ANSI C57.12.50-1981 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9
3、972545001 Not for Resale, 04/19/2007 09:30:35 MDTNo reproduction or networking permitted without license from IHS -,-,- x A N S I C57*12-50 B L m 0724350 000477Ll B m . ANSI C57.12.50-1981 requirements for ventilated dry-type distribution transformers, 1 to 500 kVA, single-phase, and 15 to 500 kVA,
4、three-phase, with high-voltage 601 to 34 500 volts, low-voltage 120 to 600 volts Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 09:30:35 MDTNo reproduction or networking permitte
5、d without license from IHS -,-,- A N S I C57.12-50 81 m 0724150 0004975 T m ANSI C57.12.50-I 981 AmericaqN ational Standard Requirements for Ventilated Dry-Type Distribution Transformers, 1 to 500 kVA, Single-Phase, and 15 to 500 kVA, Three-phase, with High-Voltage 601 to 34 500 Volts, Low-Voltage 1
6、20 to 600 Volts Secretariat Institute of Electrical and Electronics Engineers National Electrical Manufacturers Association Approved August 15,1980 American National Standards Institute, Inc . Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NAS
7、A Technical Standards 1/9972545001 Not for Resale, 04/19/2007 09:30:35 MDTNo reproduction or networking permitted without license from IHS -,-,- American National Standard ANSI C57*L2*50 B L = 0724150 0004976 L An American National Standard implies a consensus of those substantially concerned with i
8、ts scope and provisions. An American National Standard is intended as a guide to aid the manu- facturer, the consumer, and the general public. The existence of an American National Stan- dard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, ma
9、rketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned to obtain the latest editions. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time.
10、The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or writ
11、ing the American National Standards Institute. Published by American National Standards Institute 1430 Broadway, New York, New York 10018 Copyright O 1981 by American National Standards Institute, Inc All rights reserved. No part of this publication may be reproduced in any form, in an electronic re
12、trieval system or otherwise, without the prior written permission of the publisher. Printed in the United States of America AlM48115 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/200
13、7 09:30:35 MDTNo reproduction or networking permitted without license from IHS -,-,- A N S I C57.12*50 81 = 0724150 0004777 3 Foreword (This Foreword is not a part of American National Standard Requkernents for Ventilated Dry-Type Distribu- tion Transformers, 1 to 500 kVA, Single-phase, and 15 to 50
14、0 kVA, Three-phase, with High-Voltage 601 to 34 500 Volts, Low-Voltage 120 to 600 Volts, ANSIC57.12.50-1981.) This new dry-type transformer standard describes ventilated dry-type transformers with self- cooled kVA ratings 1-500, and high voltages 2400-34 500 volts. (Forced-aircooled ratings for cert
15、ain sizes are listed in Part 11.) It is also applicable from 601-2400 volts, but not for high voltages 600 volts and below, since American National Standards Committee C89 on Specialty Transformers has responsibility for transformers with high voltages 600 volts and below. This standard is part of a
16、 new series of standards for dry-type transformers that also includes Amer- ican National Standard General Requirements for Dry-Type Distribution and Power Trans- formers, ANSI/IEEE (257.12.01-1979; American National Standard Test Code for Dry-Type Distribution and Power Transformers, ANSI/IEEE C57.
17、12.91-1979; American National Stan- dard Requirements for Ventilated Dry-Type Power Transformers, 501 kVA and Larger, Three- Phase, with Kigh Voltage 601-34 500 Volts, Low-Voltage 208Y1120 to 4160 Volts, ANSI (37.12.5 1-1981; and American National Standard Requirements for Sealed Dry-Type Power Tran
18、sformers, 501 kVA and Larger, Three-phase, with High-Voltage 601-34 500 Volts, Low- Voltage 208Y/120 to 4160 Volts, ANSI C57.12.52-1981. Dry-type transformers have been covered in the past by a variety of documents, including American National Standard General Requirements for Distribution, Power, a
19、nd Regulating Transformers, ANSI C57.12.00-1973 ; American National Standard Test Code for Distribu- tion, Power, and Regulating Transformers, ANSI C57.12.90-1973 ; American National Stan- dard Dry-Type Transformers for General Applications, ANSI/NEMA ST 20-1972; and Com- mercial, Institutional, and
20、 Industrial Dry-Type Transformers, NEMA TR 27-1965 (R1976). The new standards are the result of an effort encompassing the interests of users, manufac- turers, and others dedicated to developing voluntary consensus standards primarily for dry- type transformers. They have various significant changes
21、, including higher BILs (for most volt- ages), more stringent and meaningful short-circuit requirements, improved descriptions of usual? and ?unusual? service conditions, and numerous other improvements. The new stan- dards should be easier and more efficient to use, since they are arranged accordin
22、g to the sequence in which information is normally needed. ANSI C57.12.50-198 1 includes customary units and metric (SI) units, in accordance with ANSI policy. Sound levels were discussed in the preparation of this standard, but are not included at present. As a matter of information, NEMA TR 1-1974
23、, Transformers, Regulators, and Reactors, includes data concerning dry-type transformer sound levels. It should be noted that ANSI C57.12.50-1981 covers some of the scope of ANSI C89.2-1972 (NEMA ST 20-1972). It is understood from the chairman of American National Standards Committee on Specialty Tr
24、ansformers, C89, that the committee will delete that portion of the scope of C89.2 relating to transformers 601 volts and above to eliminate duplication. This standard is a voluntary consensus standard. Its use is mandatory only when required by a duly constituted legal authority or when specified i
25、n a contractual relationship. To meet specialized needs and to allow innovation, specific changes are permissible when mutually de- termined by the user and the producer, provided such changes do not violate existing laws and are considered technically adequate for the function intended. ? When this
26、 document is used on a mandatory basis, the word ?shall? indicates mandatory re- quirements, and words ?should? and ?may? refer to matters which are recommended and permitted, respectively, but not mandatory, The applicable ANSI rules and procedures for the preparation and approval of voluntary con-
27、 sensus standards have been followed. These specify procedures for voting, review and attempted reconciliation of dissenting viewpoints, a 60-day public review period, and final review and ap- proval by the ANSI Board of Standards Review, Copyright National Electrical Manufacturers Association Provi
28、ded by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 09:30:35 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI c57.12.50 81, m 0724150 O O O T M 5 rn Suggestions for improvement of this standard will be welcome. The
29、y should be sent to the American National Standards Institute, Inc, 1430 Broadway, New York, N.Y. 10018. This standard was processed and approved for submittal to ANSI by American National Stan- dards Committee on Transformers, Regulators, and Reactors, C57. Committee approval of the standard does n
30、ot necessarily imply that a l l committee members voted for its approval. At the time it approved this standard, the C57 Committee had the following members: I. H. Koponen, Chairman C. R. Willmore, Secretary Organization Represented Name of Representative Bonneville Power Administration. . G. W. Ili
31、ff Electric Light and Power Group. R. R. Bast R. L. Ensign I. H. Koponen J. P. Markey (Alt) B. F. Smith E. A. Villasuso, Jr S. Bennon J. C. Dutton D. C. Johnson L . W. Long D. E. Massey R. L. Simpson National Electrical Manufacturers Association L. C. Aicher W. R. Courtade J. W. Dix J. D. Douglass W
32、. C. Kendall K. Lindsley (Alt) W. J. McNutt N. M. Neagle (Alt) R. L. Schwab R. J. Stahara (Alt) R. E. Uptegraff, Jr Rural Electrification Administration J. C. Arnold, Ir Tennessee Valley Authority . L. R. Smith E. J. Huber US. Bureau of Reclamation. S. J. Baxter U.S. Department of Energy . M. Smith,
33、 Jr Institute of Electrical and Electronics Engineers . Naval Facilities Engineering Command. H. P. Stickley Underwriters Lpboratories W. A. Farquhar (Alt) Subcommittee C57.12.5 on Dry-Type Transformers, which developed this standard, had the following members: John C. Dutton, Chairman Charles H. Wh
34、ite, Secretary B. F. Allen (Alt) L. G. Ananian (Alt) R. Bancroft E. J. Huber F. J. Klecic (Alt) N. J. Melton J. A. Berseth D. R. Brown F. J. Brutt C. C. Dixon R. Endicott H. E. Gabel, Jr R. H. Hollister (Alt) P. Hopknson M. Mingoia (Alt) J. J. Nay (Alt) W. J. Neiswender R. E. Rothrock R. L. Simpson
35、S. G. Vargo E. Villasuso, Jr S. A. Wiencek Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 09:30:35 MDTNo reproduction or networking permitted without license from IHS -,-,- PAGE
36、1 . Scope . 7 2 . Related Standards and Guides . 7 2.1 General 7 2.3 Revision of American National Standards Referred to in This Document . 8 Part I . Basic Electrical and Mechanical Requirements . 8 3 . Usual Service Conditions . 8 Contents SE(TT1oN c 2.2 Terminology . 8 4 . Ratings and Characteris
37、tics . 8 4.1 Kilovolt-Ampere Ratings . 8 4.2 Kilovolt-Ampere and Voltage Ratings 8 4.3 Taps 8 4.4 Insulation Levels 8 4.5 Polarity, Angular Displacement, and Terminal Markings . 8 4.6 Impedancevoltage 8 5 . Construction 10 5.1 Insulation System . 10 5.2 Accessory Location 10 5.3 Nameplate 10 5.4 Tra
38、nsformer Connections 10 Lifting Facilities and Stability . 11 5.7 Grounding Facilities 11 5.8 Transformer Enclosure 11 6 . RoutineTests 12 5.5 Tap Changing 11 5.6 7 . Tolerances 12 Part II . Other Requirements or Alternatives That May Be Specified for Some Applications . . 12 e 8 . Other Ratings and
39、 Characteristics . 12 8.1 Other Kilovolt-Ampere Ratings 12 8.2 40C Average Ambient Temperature Conditions . 12 8.3 Other Winding Temperature Rises -12 8.4 Other Insulation Systems 13 8.5 Other High-Voltage Ratings and Connections . 13 8.6 Y-Y Connected Transformers . 13 8.7 Increased Neutral Insulat
40、ion 14 8.8 Other Basic Lightning Impulse Insulation Levels (BILs) . 14 9 . Other Construction 15 9.1 High-Voltage Connection Arrangements 15 Low-Voltage Connection Arrangements . 15 9.3 Surge Arresters . 15 Unit Substation Application 15 9.5 Temperature Devices . 15 9.6 Forced-Air Cooling 16 Provisi
41、on for Future Forced-Air Cooling 16 9.8 Space Heaters 16 9.10 Terminal Blocks 16 9.1 1 Contacts . 16 9.2 9.4 9.7 9.9 Current Transformers (or Provision for Their Addition in the Future) . 16 9.12 Jacking and Moving Facilities 16 O C Copyright National Electrical Manufacturers Association Provided by
42、 IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 09:30:35 MDTNo reproduction or networking permitted without license from IHS -,-,- r I ANSI C57-12.50 43 W 0724350 OOOLI980 3 W SECTION PAGE 10 . OtherTests . 16 Tables Table 1 Self-Cooled Kilovolt-
43、Ampere Sizes 8 Table 2 Table 3 Table 4 Range of Kilovolt-Ampere and Voltage Ratings for Single-phase (AA) Range of Kilovolt-Ampere and Voltage Ratings for Three-phase (AA) Step.DownTransformers . 9 Step-Down Transformers 9 High-Voltage Line-Terminal Insulation Levels (Single-phase) . 9 Table 5 High-
44、Voltage Line Terminal Insulation Levels (Three.Phase) 9 Table 6 Low-Voltage Line Terminal Insulation Levels . 9 Table 7 Cable Bending Space I l Table 8 Clearance . 12 Table 9 Self- and Forced-Air-Cooled Ratings . 12 Table 11 Range of Kilovolt-Ampere and Voltage Ratings for Three-phase (AA) Table 12
45、High-Voltage Line Terminal Insulation Levels Table 13 Other Basic Lightning Impulse Insulation Levels (BILs) Table 10 Range of Other High-Voltage Ratings . 13 . Transformers Connected Y-Y . 14 (Three.Phase. Y-Y Connected) 14 Applicable to Windings 15 Figures Fig . 1 Angular Displacement . 10 Fig . 2
46、 Top (Plan) View 10 Fig . 3 Y-A Connection 13 Fig . 4 Y-Y Connection 15 . . . - - o a Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 09:30:35 MDTNo reproduction or networking per
47、mitted without license from IHS -,-,- A N S I C 5 7 - 1 2 - 5 0 A3 W 0724350 00047B3 5 W American National Standard Requirements for Ventilated Dry-Type Distribution Transformers, 1 to 500 kVA, Single-phase, and 15 to 500 kVA, Three-phase, with High-Voltage 601 to 34 500 Volts, Low-Voltage 120 to 60
48、0 Volts 1. Scope 1.1 This standard is intended to set forth character- istics relating to performance, limited electrical and mechanical interchangeability, and safety of the equip- ment described, and to assist in the proper selection of such equipment. 1.2 This standard describes certain electrical and me- chanical characteristics and takes into consideration certain safety features of O-HZ, two-winding, venti- lated dry-type transformers with self-cooled ratings 1 to 500 kVA, single-phase, and 15 to 500 kVA, three- phase, incl