CSA C227 5-2008 Three-phase live-front pad-mounted distribution transformers (First Edition).pdf

1、C227.5-08(reaffirmed 2013)Three-phase live-front pad-mounted distribution transformersLegal Notice for StandardsCanadian Standards Association (CSA) standards are developed through a consensus standards development process approved by the Standards Council of Canada. This process brings together vol

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17、ents hereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutes your acceptance of the terms and conditions of this Legal Notice.Standards Update ServiceC227.5-08April 2008Title: Three-phase live-front pad-mounted distribution transformersP

18、agination: 41 pages (x preliminary and 31 text), each dated April 2008To register for e-mail notification about any updates to this publicationgo to shop.csa.caclick on CSA Update ServiceThe List ID that you will need to register for updates to this publication is 2419053.If you require assistance,

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20、Mississauga, Ontario, Canada L4W 5N61-800-463-6727 416-747-4044Visit our Online Store at www.ShopCSA.caC227.5-08Three-phase live-front pad-mounted distribution transformersCSA Standard100%ISBN 978-1-55436-692-7Technical Editor: John ONeill Canadian Standards Association 2008All rights reserved. No p

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22、s its publications on Rolland Enviro100, which contains 100% recycled post-consumer fibre, is EcoLogo and Processed Chlorine Free certified, and was manufactured using biogas energy.April 2008 iiiContents Canadian Standards Association Three-phase live-front pad-mounted distribution transformersTech

23、nical Committee on Distribution Transformers viSubcommittee on Overhead and Pad-Mounted Distribution Transformers viiiPreface x1Scope 12 Reference publications 13 Definitions 24 Electrical characteristics 34.1 kV A ratings 34.2 Electrical connection and designation 34.2.1 Basic construction 34.2.2 A

24、ngular displacement 34.2.3 Core grounding 34.2.4 Standard high-voltage winding connection 34.2.5 GrdY-GrdY-connected transformers 34.3 Temperature rise 34.4 Loading capabilities 34.5 Off-circuit voltage taps 44.6 Insulation class and preferred voltages 44.6.1 Preferred high-voltage ratings and requi

25、red BIL ratings 44.6.2 Preferred low-voltage ratings and required BIL ratings 44.6.3 BIL of the high-voltage cable entrance compartment 44.7 Operating voltage range 44.8 Radio interference 44.9 Audible sound 44.10 Short-circuit capability 44.10.1 General 44.10.2 Transformers with impedances greater

26、than 4% 54.11 Impedance 54.12 Energy efficiency 54.13 Clearances 54.14 Insulating barriers 55 Mechanical features 55.1 General 55.1.1 Dimensions 55.1.2 Transformer tank 55.1.3 Lifting and jacking 65.1.4 Transformer base 65.1.5 Drain valves, pressure-relief devices, and liquid level indicators 65.1.6

27、 Accessibility of internal components 65.1.7 Transformer assembly 65.1.8 Off-circuit tap changer and voltage selector switches 65.1.9 Transformer accessories 65.1.10 Liquid insulant 65.2 Cable entrance compartment 6C227.5-08 Canadian Standards Associationiv April 20085.2.1 Arrangement 65.2.2 Metal b

28、arrier 75.2.3 Doors 75.2.4 Compartment integrity and locking provisions 75.2.5 Hinges 75.2.6 Condensation inhibitor 75.2.7 Sill 75.2.8 Internal flange 75.2.9 Sides, sill, doors, and roof 76 Bushings, terminals, and grounding 86.1 General 86.2 High-voltage bushings 86.3 Low-voltage bushings 86.4 Grou

29、nding 86.4.1 Grounding spade terminals 86.4.2 Grounding assembly 96.4.3 Neutral terminal 96.4.4 Bonding of bolted tank cover 97 Tests 98 Quality of work and finish 98.1 General 98.2 Exterior finish 98.3 Colour 98.4 Welding 98.5 Tolerances 109Markings 109.1 Combined nameplate and connection diagram 1

30、09.2 Additional plates 109.3 Terminal connections 109.4 Warning labels 109.4.1 Welded cover 109.4.2 Off-circuit switch 109.4.3 Electrical hazard warning labels 109.5 Information on exterior of transformer 109.5.1 Information tag 109.5.2 Gross weight 119.5.3 Non-PCB sticker 119.5.4 Stock code number

31、1110 Optional items 11AnnexesA (normative) Warning labels 26Tables1 Designation of voltage ratings (schematic representation) 122 Preferred high-voltage ratings and required BIL ratings 133 Preferred low-voltage ratings and required BIL ratings 134 Limits for radio interference 145 Audible sound lev

32、el 14 Canadian Standards Association Three-phase live-front pad-mounted distribution transformersApril 2008 v6 Short-circuit capability 147 Minimum transformer impedance 158 Transformer dimensions 159 Low-voltage spade terminals 1510 Dielectric test values 16Figures1 Transformer dimensions (I) 172 T

33、ransformer dimensions (II) 183 Transformer dimensions (III) 194 Transformer dimensions (IV) 205 Transformer dimensions (V) 216 Captive pentahead bolt arrangements 227 Low-voltage spade terminals 238 Rear and side markings and other features 249 Cabinet door markings 2410 Non-PCB sticker 25C227.5-08

34、Canadian Standards Associationvi April 2008Technical Committee on Distribution TransformersF. Chan Fortis Alberta,Calgary, AlbertaChairA. Beattie Electrical (b) provide an explanation of circumstances surrounding the actual field condition; and(c) be phrased where possible to permit a specific “yes”

35、 or “no” answer.Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are published in CSAs periodical Info Update, which is available on the CSA Web site at www.csa.ca. Canadian Standards Association Three-phase live-front pad-mou

36、nted distribution transformersApril 2008 1C227.5-08Three-phase live-front pad-mounted distribution transformers1Scope1.1This Standard specifies requirements for three-phase live-front pad-mounted distribution transformer units that (a) consist of a transformer and a separable or integral cable entra

37、nce compartment;(b) are rated 75 to 3000 kV A and intended for operation on three-phase underground distribution systems having the preferred rated voltages specified in Tables 1 and 2; and(c) are intended for mounting outdoors on pads without additional protective enclosures. 1.2This Standard does

38、not apply to equipment involving enclosures for housing a separate three-phase transformer or a bank of single-phase transformers (see CAN/CSA-C2.1).Note: It is possible that transformers complying with this Standard will, if operated by a body other than an electrical utility, be subject to additio

39、nal requirements specified by the electrical inspection authority having jurisdiction.1.3This Standard allows for the replacement of a live-front pad-mounted unit by another unit of the same basic physical size from a different manufacturer without modification to cables or pad. This Standard covers

40、 terminal arrangements for both radial and loop-feed systems, including certain minimum and other dimensions.Note: This concept should not be understood to imply that the cable entrance compartment of one manufacturers transformer will be compatible with that of another manufacturers transformer.1.4

41、In CSA Standards, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; “may” is used to express an option or that which is permissi

42、ble within the limits of the standard; and “can” is used to express possibility or capability. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to ta

43、bles and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.2 Reference publicationsThis Standard refers to the following publications, and where such reference

44、 is made, it shall be to the edition listed below, including all amendments published thereto.CSA (Canadian Standards Association)CAN/CSA-C2.1-06Single-phase and three-phase liquid-filled distribution transformersC227.5-08 Canadian Standards Association2 April 2008CAN/CSA-C50-97 (R2006)Insulating oi

45、l, electrical for transformers and switchesCAN3-C108.3.1-M84 (R2005)Limits and measurement methods of electromagnetic noise from ac power systems, 0.1530 MHzCAN/CSA-C227.4-06Three-phase, pad-mounted distribution transformers with separable insulated high-voltage connectorsCAN/CSA-C802.1-00 (R2005)Mi

46、nimum efficiency values for liquid-filled distribution transformersW47.1-03Certification of companies for fusion welding of steelW59-03Welded steel construction (metal arc welding)IEEE (Institute of Electrical and Electronics Engineers)C57.12.28-2005IEEE Standard for Pad-Mounted Equipment-Enclosure

47、IntegrityC57.12.90-2006IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating TransformersC57.91-1995IEEE Guide for Loading Mineral-Oil-Immersed TransformersASTM International (American Society for Testing and Materials)D 1816-04Standard Test Method for Dielectric Breakdown

48、Voltage of Insulating Oils of Petroleum Origin Using VDE Electrodes3 DefinitionsThe following definitions apply in this Standard:Cable entrance compartment a metal enclosure that is open at the bottom for cable entry and divided into a high-voltage cable compartment and a low-voltage cable compartme

49、nt, each with its own door.KNAN insulating liquid with a fire point greater than 300 C.Live-front having both high-voltage and low-voltage terminals exposed and unshielded when the compartment doors are open.LNAN insulating liquid with no measurable fire point.Tamper resistant the state in which a completely assembled apparatus resists unauthorized entry when tested in accordance with IEEE C57.12.28. Canadian Standards Association Three-phase live-front pad-mounted distribution transformersApril 2008 3Weather res