1、CAN3-C235-83(reaffirmed 2015)Preferred voltage levels for AC systems, 0 to 50 000 VThe Canadian Standards Association (CSA), under whose auspices this National Standard has been pro- duced, was chartered in 1919 and accredited by the Standards Council of Canada to the National Standards system in 1
2、973. It is a not-for-profit, nonstatutory, voluntary membership association engaged in stand- ards development and certification activities. CSA standards reflect a national consensus of produc- ers and users including manufacturers, consumers, retailers, unions and professional organizations, and g
3、overnmental agencies. The standards are used widely by industry and commerce and often adopted by mu- nicipal, provincial, and federal governments in their regulations, particularly in the fields of health, safety, building and construction, and the environment. Individuals, companies, and associati
4、ons across Can- ada indicate their support for CSAs standards develop- ment by volunteering their time and skills to CSA Committee work and supporting the Associations ob- jectives through sustaining memberships. The more than 7000 committee volunteers and the 2000 sustain- ing memberships together
5、form CSA s total membership from which its Directors are chosen. Sustaining mem- berships represent a major source of income for CSAs standards development activities. The Association offers certification and testing seivices in sup port of and as an extension to its standards development activities
6、. To ensure the integrity of its certification process, the Association regularly and con- tinually audits and inspects products that bear the CSA Mark. In addition to its head office and laboratory complex in Rexdale (Toronto), CSA has regional branch offices in major centres across Canada and insp
7、ection and testing agencies in eight countries. Since 1919, the Association has developed the necessary expertise to meet its cor- porate mission: CSA is an independent service organi- zation whose mission is to provide an open and effective forum for activities facilitating the exchange of goods an
8、d services through the use of standards, certification and related services to meet national and international needs. For further information on CSA services, write to Canadian Standards Association 178 Rexdale Boulevard Rexdale (Toronto), Ontario, Canada M9W 1R3 The Standards Council of Canada is t
9、he coordinat- ing body of the National Standards system, a federation of independent, autonomous organizations working to- wards the further development and improvement of voluntary standardization in the national interest. The principal objects of the Council are to foster and promote voluntary sta
10、ndardization as a means of ad- vancing the national economy, benefiting the health, safety, and welfare of the public, assisting and pro tect- ing the consumer, facilitating domestic and interna- tional trade, and furthering international cooperation in the field of standards. A National Standard of
11、 Canada is a standard which has been approved by the Standards Council of Canada and one which reflects a reasonable agreement among the views of a number of capable individuals whose collective interests provide to the greatest practicable extent a balance of representation of producers, users, con
12、sumers, and others with relevant interests, as may be appropriate to the subject in hand. It normally is a standard which is capable of making a significant and timely contribution to the national interest. Approval of a standard as a National Standard of Canada indicates that a standard conforms to
13、 the cri- teria and procedures established by the Standards Council of Canada. Approval does not refer to the technical content of the standard; this remains the continuing responsibility of the accredited standards- writing organization. Those who have a need to apply standards are encour- aged to
14、use National Standards of Canada whenever practicable. These standards are subject to periodic review; therefore, users are cautioned to obtain the latest edition from the organization preparing the standard. The responsibility for approving National Standards of Canada rests with the Standards Coun
15、cil of Canada 45 OConnor Street Suite 1200 Ottawa, Ontario K1P 6N7 Les normes nationales du Canada sont publies en versions fran aise et anglaise. General Instruction No. 1CAN3-C235-83September 1983Title: Preferred voltage levels for AC systems, 0 to 50 000 VPagination: 11 pages, each dated Septembe
16、r 1983To register for e-mail notification about any updates to this publicationgo on-line to shop.csa.caclick on E-mail Services under MY ACCOUNTclick on CSA Standards Update ServiceThe List ID that you will need to register for updates to this publication is 2000693.If you require assistance, pleas
17、e e-mail techsupportcsa.ca or call 416-747-2233.Visit CSAs policy on privacy at csagroup.org/legal to find out how we protect your personal information.Blank pageNATIONAL STANDARD OF CANADA CAN3-C235-83 Preferred Voltage Levels for AC Systems, o to 50 000 V Prepared by CANADIAN STANDARDS ASSOCIATION
18、 Approved by STANDARDS COUNCIL OF CANADA ISSN 031 7-5669 PUBLISHED IN SEPTEMBER, 1983 BY CANADIAN STANDARDS ASSOCIATION, 178 REXDALE BOULEVARD, REXDALE (TORONTO), ONTARIO, CANADA M9W 1R3 COPYRIGHT CANADIAN STANDARDS ASSOCIATION1983 ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY BE REPRODUCED I
19、N ANY FORM, IN AN ELECTRONIC RETRIEVAL SYSTEM OR OTHERWISE, WITHOUT THE PRIOR PERMISSION OF THE PUBLISHER. Blank pagePreferred Voltage Levels for AC Systems, 0 to 50 000 V 3 Contents Page 4 Technical Committee on Preferred Voltage Levels for AC Systems 5 Preface Standard 7 1. Scope 7 2. ExplanatIon
20、of Terms 8 3. Nominal System Voltages 8 4. Recommended Voltage Variation Limits for Circuits up to 1000 V, at Utilization Points 8 5. Recommended Voltage Variation Limits for Circuits up to 1000 V, at Service Entrances 8 6. Recommended Voltage Variation Limits at Point of Sale and Purchase for Circu
21、its Above 1000 V But Not Over 50 000 V 9 Tables September, 1983 4 GSA Standard GAN3-C235-83 Technical Committee on Preferred Voltage Levels for AC Systems W.H. Prevey (Chairman) Prevey Consulting Services Ltd., Willowdale, Ontario H.P. Aubin Hyd ro-Quebec, Montreal Representing Canadian Electrical A
22、ssociation R.R. Cowell Domtar Inc., Montreal, Quebec R.S. Gray H.H. Angus and Associates Limited, Don Mills, Ontario R.L. Hicks Toronto Hydro, Ontario Representing Association of Municipal Electrical Utilities of Ontario R.M. Howchln Sylvania Electrical Equipment, Scarborough, Ontario Representing E
23、lectrical and Electronic Manufacturers Association of Canada F. hey Ontario Hydro, Toronto Representing Canadian Electrical Association G.C. King Nova Scotia Power Corp., Halifax Representing Canadian Electrical Association F.J. Otte British Columbia Hydro and Power Authority, Vancouver Representing
24、 Canadian Electrical Association D. Wiegand Westinghouse Canada Inc., London, Ontario Representing Electrical and Electronic Manufacturers Association of Canada H.Z. Rogers (Standards Administrator, Non-voting) Canadian Standards Association, Rexdale, Ontario September, 1983 Preferred Voltage Levels
25、 for AC Systems, 0 to 50 000 V 5 Preface This is the second edition of CSA Standard C235 (now CAN3-C235) and it supersedes the first edition, which was published in 1969. Priorto 1969 the need for a recognized set of voltage standards in Canada had been the concern of the electrical industry through
26、out its history. In preparation forthefirst edition many studies, questionnaire surveys, and discussions of national scope were conducted. Since its initial publication in 1969 this Standard has served well as a guide to those who are involved in the problems of applying a great variety of electrica
27、l devices and equipment to an equally great variety of voltage levels across the country. Improved equipment design ratings and controlled system design levels have both resulted. This second edition calls for closer control of voltage variation for circuits between the 1000 and 50 000 V levels. Oth
28、erwise, it is essentially the same as the first edition. This Standard was prepared by the Technical Committee on Preferred Voltage Levels for AC Systems under the jurisdiction of the Standards Steering Committee for Electrical Engineering Standards. It has been approved as a National Standard of Ca
29、nada by the Standards Council of Canada. September, 1983 Note: Although the intended primary application of this Standard is stated in its Scope, It is important to note that it remains the responsibility of the user of the Standard to judge its suitability for his or her particular purpose. CSA Sta
30、ndards are subject to periodical review and suggestions for their improvement will be referred to the appropriate committee. All enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association, Standards Division, 178 Rexdalo Boulevard,
31、 Rexdale (Toronto), Ontario M9W 1R3. Requests for interpretation should: (a) Define the problem, making reference to a specific Clause, and, where appropriate, include an illustrative sketch; (b) Provide an explanation of circumstances surrounding the actual field condition; and (c) Be phrased, wher
32、e possible, to permit a specific “yes“ or “no“ answer. Interpretations are published in “GSA Information Update“. For subscription details and a free sample copy, write to CSA In formation Centre or telephone (416) 747-4058. September, 1983 6 GSA Standard GAN3-G235-83 September, 1983 CAN3-C235-83 Pr
33、eferred Voltage Levels for AC Systems, 0 to 50 000 V 7 1. Scope 1.1 This Standard establishes voltage standards for AC Systems in Canada to provide a guide: (a) To national committees on utilization and control equipment or devices for establishing standard ratings of such equipment or devices on a
34、basis coordinated with standard systems; (b) To system designers so that new systems will be designed to accommodate standard ratings of equipment and devices; (c) To system operators and to electrical energy users for determining the need for corrective measures, with respect to existing systems, t
35、o accommodate current designs of equipment and devices; and (d) Towards a uniform system of voltage selections in the country without any suggestion that each utility will supply every voltage listed. The establishment of standards on this basis is aimed at future development towards more uniformity
36、 on a national basis. 2. Explanation of Terms 2.1 It is to be noted that this Standard includes nominal voltages and recommended limits to voltage variations under both normal and extreme operating conditions. It should further be pointed out that the voltage listings are not intended as limits of v
37、oltage levels which may be experienced during abnormal (or fault) conditions, nor during starting conditions where heavy starting loads are involved. 2.2 Nominal voltage is the voltage by which a system is designated. 2.3 In the interpretation of this Standard it is important to bear in mind the sen
38、se of usage for the terms Normal Operating Conditions and Extreme Operating Conditions: (a) Normal Operating Conditions. Where voltages lie within the indicated limits under this heading no improvement or corrective action is required. It is recognized that special situations may call for closer vol
39、tage control, but such cases are considered to be outside the application scope of this Standard; and (b) Extreme Operating Conditions. Where voltages lie outside the indicated limits for normal operating conditions but within the indicated limits for extreme operating conditions improvement or corr
40、ective action should be taken on a planned and programmed basis but not necessarily on an emergency basis. Where voltages lie outside the indicated limits for extreme operating conditions, improvement or corrective action should be taken on an emergency basis. The urgencyforsuch action will depend o
41、n many factors such as location and nature of load or circuit involved, extent to which limits are exceeded with respectto voltage levels and duration, etc. 2.4 It is also to be noted that a distinction is made in this Standard between the terms subtransmission circuits and distribution circuits. Th
42、esetermsare used inthefollowing sense: (a) Subtransmission circuits are generally of the three-phase variety for carrying bulk power: (i) From a utility main station to a substation of the same utility; (ii) From a main station of one utility to a substation of a second utility; (iii) From a utility
43、 station to a large user who purchases three-phase power and distributes from his own substation; and (b) Distribution circuits generally consistof three-phase mains with single-phase branches for distributing power from utility substations (or the equivalent) to a mixture of three-phase and single-
44、phase loads. Generally the distribution circuit terminates at the distribution transformers which step the voltage down to utilization level. These transformers may be single- or three-phase and may be located either at the power users service entrance or dispersed along the length of the distributi
45、on circuit. September, 1983 8 GSA Standard GAN3-G235-83 3. Nominal System Voltages 3.1 Nominal system voltages are shown in Table 1. 4. Recommended Voltage Variation Limits for Circuits up to 1000 V, at Utilization Points 4.1 The recommended voltage variation limits for circuits up to 1000 V, at uti
46、lization points, are shown in Table 2. 4.2 Caution re: Application of Motors and Other Equipment. These recommended standards are for circuit or system voltages, and not for ratings of utilization equipment such as motors. Nevertheless, it is considered advisable to add a word of caution in the appl
47、ication of such electrical equipmentto utilization circuits, asfollows: MOTORS AND OTHER EQUIPMENT DESIGNED FOR APPLICATION TO MORE THAN ONE NOMINAL SYSTEM VOLTAGE LEVEL (SUCH AS 120/208Y AND 240 V SYSTEMS) MUST RECOGNIZE THE MINIMUM RECOMMENDED VOLTAGE LIMITS OF THE ONEAND MAXIMUM RECOMMENDED VOLTA
48、GE LIMITS OFTHE OTHER NOMINAL SYSTEM VOLTAGE LEVEL. 5. Recommended Voltage Variation Limits for Circuits up to 1000 V, at Service Entrances 5.1 The recommended voltage variation limits for circuits up to 1000 V, at service entrances, are shown in Table 3. 5.2 Table 3 is intended for general applicat
49、ion and takes into account secondary voltage drop on the utility system. Forthree-phase serviceto large buildings where the utility transformer installation is on the customers property, and the service entrance is immediately adjacent to the transformer installation so that the utility has very little secondary voltage drop, the service entrance voltages should not fall below nominal voltage by more than: (a) 5% for normal operating conditions; nor (b) B/a for extreme operating conditions. 6. Recommended Voltage Variation Limits at Point of Sale and Purchase for Circuits Abo
