1、 ANSI C84.1-2011 Revision of ANSI C84.1-2006 American National Standard Electric Power Systems and Equipment Voltage Ratings (60 Hertz) ANSI C84.1-2011 Revision of ANSI C84.1-2006 American National Standard Electric Power Systems and Equipment Voltage Ratings (60 Hertz) Secretariat: National Electri
2、cal Manufacturers Association Approved January 17, 2012 American National Standards Institute, Inc. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was develo
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11、atement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. ANSI C84.1-2011 Copyright 2011 by National Electrical Manufacturers Association i AMERICAN NATIONAL STAND
12、ARD Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial ag
13、reement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of
14、 American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National S
15、tandards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Instit
16、ute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. Caution Notice: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that
17、 action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by National Electrical Manufacturers Association 1300 No
18、rth 17th Street, Rosslyn, VA 22209 g164 Copyright 2011 by National Electrical Manufacturers Association All rights reserved including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the I
19、nternational and Pan American Copyright Conventions. 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. Printed in the United States of America. ANSI C84.1-2011 ii Copyright 2011 by Nationa
20、l Electrical Manufacturers Association This page intentionally left blank. ANSI C84.1-2011 Copyright 2011 by National Electrical Manufacturers Association iii Contents Page Foreword iv 1 Scope and purpose . 1 1.1 Scope . 1 1.2 Purpose 1 2 Definitions . . 1 3 System voltage classes 2 4 Selection of n
21、ominal system voltages 2 5 Explanation of voltage ranges 3 5.1 Application of voltage ranges . 3 5.1.1 Range Aservice voltage 3 5.1.2 Range Autilization voltage 3 5.1.3 Range Bservice and utilization voltages . 3 5.1.4 Outside Range Bservice and utilization voltages . 3 6 Voltage ratings for 60-hert
22、z electric equipment 4 6.1 General . 4 6.2 Recommendation . 4 Table 1 . 5 Annex A Principal transformer connections to supply the system voltages of Table 1 7 Annex B Illustration of voltage ranges of Table 1 . 8 Annex C Polyphase voltage unbalance 9 Annex D Applicable standards 11 ANSI C84.1-2011 i
23、v Copyright 2011 by National Electrical Manufacturers Association Foreword (This Foreword is not part of American National Standard C84.1-2006) This standard supersedes American National Standard for Electric Power Systems and Equipment - Voltage Ratings (60 Hz), ANSI C84.1-2006. Standard nominal sy
24、stem voltages and voltage ranges shown in ANSI C84.1-2006 have been extended to include maximum system voltages of up to and including 1200 kV. In 1942, the Edison Electric Institute published the document Utilization Voltage Standardization Recommendations, EEI Pub. No. J-8. Based on that early doc
25、ument, a joint report was issued in 1949 by the Edison Electric Institute (EEI Pub. No. R6) and the National Electrical Manufacturers Association (NEMA Pub. No. 117). This 1949 publication was subsequently approved as American National Standard EEI-NEMA Preferred Voltage Ratings for AC Systems and E
26、quipment, ANSI C84.1-1954. American National Standard C84.1-1954 was a pioneering effort in its field. It not only made carefully considered recommendations on voltage ratings for electric systems and equipment, but also contained a considerable amount of much-needed educational material. After ANSI
27、 C84.1-1954 was prepared, the capacities of power supply systems and customers wiring systems increased and their unit voltage drops decreased. New utilization equipment was introduced and power requirements of individual equipment were increased. These developments exerted an important influence bo
28、th on power systems and equipment design and on operating characteristics. In accordance with American National Standards Institute policy requiring periodic review of its standards, American National Standards Committee C84 was activated in 1962 to review and revise American National Standard C84.1
29、-1954, the Edison Electric Institute and National Electrical Manufacturers Association being named cosponsors for the project. Membership on the C84 Committee represented a wide diversity of experience in the electrical industry. To this invaluable pool of experience were added the findings of the f
30、ollowing surveys conducted by the committee: (1) A comprehensive questionnaire on power system design and operating practices, including measurement of actual service voltages. (Approximately 65,000 readings were recorded, coming from all parts of the United States and from systems of all sizes, whe
31、ther measured by number of customers or by extent of service areas.) (2) A sampling of single-phase distribution transformer production by kilovolt-amperes and primary voltage ratings to determine relative uses of medium voltages. (3) A survey of utilization voltages at motor terminals at approximat
32、ely twenty industrial locations The worth of any standard is measured by the degree of its acceptance and use. After careful consideration, and in view of the state of the art and the generally better understanding of the factors involved, the C84 Committee concluded that a successor standard to ANS
33、I C84.1-1954 should be developed and published in a much simplified form, thereby promoting ease of understanding and hence its acceptance and use. This resulted in the approval and publication of American National Standard C84.1-1970, followed by its supplement, ANSI C84.1a-1973, which provides vol
34、tage limits established for the 600-volt nominal system voltage. The 1977 revision of the standard incorporated an expanded Foreword that provided a more complete history of this standards development. The 1970 revision included a significantly more useful Table 1 (by designating “preferred” system
35、voltages), the 1977 revision provided further clarity, and the 1982 revision segmented the system voltages into the various voltage classes. ANSI C84.1-2011 Copyright 2011 by National Electrical Manufacturers Association v With the 2006 revision, the scope expanded to include voltages above 230 kV.
36、This increased voltage range was previously covered by IEEE Std 1312-1993 (R2004), IEEE Standard Preferred Voltage Ratings for Alternating-Current Electrical Systems and Equipment Operating at Voltages Above 230 kV Nominal, and its predecessor, ANSI C92.2-1987. With the 2011 revision, Table 1 was mo
37、dified to reflect changes in lighting characteristics. Note 1 allowed lower utilization voltages for non-lighting circuits. Modern lighting equipment does not need this special treatment. Note 1 was dropped and the table was updated with the lower voltages. This treats lighting equipment like all ot
38、her utilization equipment. Suggestions for improvement of the standard will be welcome. They should be sent to the National Electrical Manufacturers Association, 1300 North 17th Street, Rosslyn, VA 22209. This standard was processed and approved for submittal to ANSI by Accredited Standards Committe
39、e on Preferred Voltage Ratings for AC Systems and Equipment, C84. Committee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the C84 Committee had the following members: Daniel Ward, Chairman Ryan Franks (Na
40、tional Electrical Manufacturers Association), Secretary Organizations Represented Name of Representative Alabama Power Company Reuben Burch Quanta Technology James Burke NorthWestern Energy James Cole Conrad Technical Services LLC Larry Conrad Baldor Electric Company Roger Daugherty Connecticut Ligh
41、t and Power Company Lauren Gaunt PacifiCorp Dennis Hansen T. David Mills Associates T. David Mills Edison Electric Institue Gregory Obenchain Siemens Energy, Inc. T. W. Olsen National Rural Electric Cooperative Association Michael Pehosh Peter Philips Harman Consulting Group National Rural Electric
42、Cooperative Association Robert Saint Smullin Engineering, Inc. Gary Smullin ANSI C84.1-2011 vi Copyright 2011 by National Electrical Manufacturers Association General Electric Reigh Walling Dominion Virginia Power Daniel Ward ANSI C84.1-2011 Copyright 2011 by National Electrical Manufacturers Associ
43、ation 1 AMERICAN NATIONAL STANDARD ANSI C84.1-2011 For Electric Power Systems and Equipment Voltage Ratings (60 Hertz) 1 Scope and purpose 1.1 Scope This standard establishes nominal voltage ratings and operating tolerances for 60-hertz electric power systems above 100 volts. It also makes recommend
44、ations to other standardizing groups with respect to voltage ratings for equipment used on power systems and for utilization devices connected to such systems. This standard includes preferred voltage ratings up to and including 1200 kV maximum system voltage, as defined in the standard. In defining
45、 maximum system voltage, voltage transients and temporary overvoltages caused by abnormal system conditions such as faults, load rejection, and the like are excluded. However, voltage transients and temporary overvoltages may affect equipment operating performance and are considered in equipment app
46、lication. 1.2 Purpose The purposes of this standard are to: (1) Promote a better understanding of the voltages associated with power systems and utilization equipment to achieve overall practical and economical design and operation (2) Establish uniform nomenclature in the field of voltages (3) Prom
47、ote standardization of nominal system voltages and ranges of voltage variations for operating systems (4) Promote standardization of equipment voltage ratings and tolerances (5) Promote coordination of relationships between system and equipment voltage ratings and tolerances (6) Provide a guide for
48、future development and design of equipment to achieve the best possible conformance with the needs of the users (7) Provide a guide, with respect to choice of voltages, for new power system undertakings and for changes in older ones 2 Definitions 2.1 system or power system: The connected system of p
49、ower apparatus used to deliver electric power from the source to the utilization device. Portions of the system may be under different ownership, such as that of a supplier or a user. 2.2 system voltage terms. As used in this document, all voltages are rms phase-to-phase, except that the voltage following a slant-line is an rms phase-to-neutral voltage. 2.2.1 system voltage: The root-mean-square (rms) phase-to-phase voltage of a portion of an alternating-current electric
