CSA C301 1-2006 Single-Phase Submersible Distribution Transformers (Second Edition).pdf

1、C301.1-06(reaffirmed 2011)Single-phase submersible 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 volunteers re

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16、.CSA Standards Update ServiceC301.1-06March 2006Title: Single-phase submersible distribution transformersPagination: 15 pages (vii preliminary and 8 text), each dated March 2006To register for e-mail notification about any updates to this publicationgo to www.ShopCSA.caclick on E-mail Services under

17、 MY ACCOUNTclick on CSA Standards Update ServiceThe List ID that you will need to register for updates to this publication is 2019184.If you require assistance, please e-mail techsupportcsa.ca or call 416-747-2233.Visit CSAs policy on privacy at www.csagroup.org/legal to find out how we protect your

18、 personal information.Published in March 2006 by Canadian Standards AssociationA not-for-profit private sector organization5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N61-800-463-6727 416-747-4044Visit our Online Store at www.ShopCSA.caC301.1-06Single-phase submersible distributi

19、on transformersCSA StandardISBN 1-55436-169-9Technical Editor: John ONeill Canadian Standards Association 2006All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.March 2006 iiiContents Canadian Standards Association

20、Single-phase submersible distribution transformersTechnical Committee on Distribution Transformers ivSubcommittee on Network and Submersible Distribution Transformers viPreface vii1Scope 12 Reference publications and definitions 22.1 Reference publications 22.2 Definitions 23 Electrical features 23.

21、1 General 23.2 Voltage designation 33.3 Voltage and basic impulse insulation levels (BIL) 34 Mechanical features 34.1 General 34.2 Sealed construction 44.3 Lifting lugs 44.4 Tanks 44.5 Handhole 45 Bushings, terminals, and grounding 45.1 Bushings and terminals 45.2 Grounding 55.2.1 Tank grounding con

22、nector 55.2.2 Low-voltage grounding conductor 55.2.3 Electrical bonding of cover to tank 56 Finish 67Tests 68Marking 68.1 Nameplate and connection diagram 68.2 Nameplate material and marking 68.3 Terminal marking 69 Optional accessories and features 6Tables1 Preferred high-voltage and required BIL r

23、atings 72 Cable sizes 73 Electrical characteristics of completely assembled high-voltage terminals 7Figures1 Arrangement and location of terminals for submersible transformers 82 Spade terminal 8C301.1-06 Canadian Standards Associationiv March 2006Technical Committee on Distribution TransformersF. C

24、han Utilicorp Networks Canada,Calgary, AlbertaRepresenting Canadian Electricity AssociationChairG. Morrissette VA TECH Transformateurs Ferranti-Packard Inc.,Trois-Rivires, QubecRepresenting Canadian Electricity AssociationVice-ChairA. Beattie Electric and Utilities Safety Association,Mississauga, On

25、tarioM. Bell Hydro One Networks Inc.,Toronto, OntarioM. Culhane Cooper Power Systems Inc.,Waukesha, Wisconsin, USARepresenting NEMAAssociateR. de Lhorbe Schneider Canada Inc.,Mississauga, OntarioM. Fischer BC Hydro,Burnaby, British ColumbiaD. Galloway ABB Power T (b) provide an explanation of circum

26、stances surrounding the actual field condition; and(c) be phrased where possible to permit a specific “yes” or “no” answer.Committee interpretations are processed in accordance with the CSA Directives and guidelines governingstandardization and are published in CSAs periodical Info Update, which is

27、available on the CSA Web site atwww.csa.ca. Canadian Standards Association Single-phase submersible distribution transformersMarch 2006 1C301.1-06Single-phase submersible distribution transformers1Scope1.1This Standard covers the features of single-phase submersible transformers rated 25 to 333 kV A

28、.Note: For details not covered herein, reference should be made to CSA C2.1.1.2This Standard applies only to single-phase distribution transformer units intended for use in a ventilated vault or enclosure below grade level, with all terminations and accessories cover mounted, or nearly so, for opera

29、tion above grade. It does not apply to(a) directly buried transformers in contact with the earth;(b) permanently submerged transformers; or(c) network-type transformers.1.3The transformers covered by this Standard are intended only for operation by electrical utilities on effectively grounded underg

30、round distribution systems having primary voltages up to and including 16.0/27.6 kV grounded Y.Note: The operation of transformers complying with this Standard by other than an electric utility may be subject to additional requirements by the electrical inspection authority having jurisdiction.1.4Th

31、e equipment covered by this Standard typically has dual high-voltage bushings designed for circuit loop feed within the transformer tank. High-voltage fuse protection normally connected between this internal loop feed element and the transformer high-voltage winding is not covered by this Standard a

32、nd specified by the purchaser.1.5In 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

33、 option or that which is permissible 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

34、informative material. Notes to tables 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.C301.1-06 Canadian Standards Association2 March 20062 Reference pub

35、lications and definitions2.1 Reference publicationsThis Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below.CSA (Canadian Standards Association)C2.1-06Single-phase and three-phase liquid-filled distribution transformersC22.2 No. 38

36、-05Thermoset insulated wires and cablesANSI (American National Standards Institute)C57.12.28-2005Pad-Mounted Equipment Enclosure IntegrityIEEE (Institute of Electrical and Electronics Engineers)IEEE 386-1995Separable Insulated Connector Systems for Power Distribution Systems Above 600 V2.2 Definitio

37、nsThe following definitions apply in this Standard:Effectively grounded under line-to-ground fault conditions, the rms voltage-to-ground of the ungrounded phase cannot exceed 80% of the normal phase-to-phase voltage.Submersible transformer a transformer intended to operate for its design life instal

38、led in a vault and subjected to occasional total submersion and frequent wetting due to seepage of sewage and street orsalt water.3 Electrical features3.1 General3.1.1Each transformer shall comply with the electrical requirements of CSA C2.1, except as specified in this Standard.3.1.2The high-voltag

39、e winding shall be insulated for use on effectively grounded systems only, with H2 connected internally to the tank or cover at the location of one external grounding boss (marked H2).3.1.3The low-voltage winding shall normally be 240/120 V and shall not be reconnectable externally for 120 V. Other

40、secondary voltages in accordance with CSA C2.1, 1.2 kV class may be provided when specified by the purchaser.3.1.4The rated kV A capacities at rated voltage shall be 25, 50, 75, 100, 167, 250, or 333. Canadian Standards Association Single-phase submersible distribution transformersMarch 2006 33.1.5K

41、ilovolt-ampere ratings are continuous and based on the winding temperature rise not exceeding 55 C average and 70 C hottest-spot. The temperature rise of the insulating oil shall not exceed 55 C, when measured near the top of the tank.3.1.6The transformers shall have a 65 C temperature rise insulati

42、on system.3.2 Voltage designation3.2.1Voltage designations of the form E1GrdY/E (e.g., 12 470 GrdY/7 200) indicate that the high-voltage winding is wound for E volts with reduced insulation at the neutral end for grounding.3.2.2The voltage designation 240/120 indicates that the winding is for 240 V

43、with full kV A between X1 and X3 or for 120 V with one-half kV A from X2 to either X1 or X3.3.3 Voltage and basic impulse insulation levels (BIL)3.3.1Preferred high-voltage ratings and the required BIL for transformers are shown in Table 1.3.3.2The normal low-voltage rating is 240/120 V with an insu

44、lation class of 1.2 kV. The required BIL is 30 kV.4 Mechanical features4.1 General4.1.1All switch and fuse hardware, accessories, nameplates, and other fixtures exposed to the underground environment shall be corrosion-resistant.4.1.2The tank shall have a steel base welded thereto. The base shall su

45、pport the tank at a minimum distanceof 38 mm above the floor.4.1.3When external cooling devices are used, fixed mechanical protection shall be provided at the base of the transformer to prevent damage to the cooling devices when lowering the transformer into the vault.4.1.4Dimensional constraints ar

46、e as specified by the purchaser.C301.1-06 Canadian Standards Association4 March 20064.2 Sealed construction4.2.1The complete transformer assembly shall be of sealed construction and shall remain effectively sealed for a top oil temperature range of 40 to 105 C.4.2.2Provision shall be made on all uni

47、ts for the manual release of gas pressures, before servicing, by means of a valve or plug.4.3 Lifting lugsLifting lugs shall be provided.4.4 TanksTanks for transformers up to and including 100 kV A shall not have external cooling devices. External tank walls shall be smooth to minimize corrosion and

48、 to reduce the possibility of damage to the protective coating.4.5 HandholeIf a welded cover is supplied, a handhole shall be provided for tap changing or inspection purposes. The handhole shall be of adequate size and located in the cover.5 Bushings, terminals, and grounding5.1 Bushings and termina

49、ls5.1.1Each transformer shall be supplied with terminals and an accessory parking stand located as shown in Figure 1. The accessory parking stand shall be for load-break accessories unless otherwise specified.5.1.2Two high-voltage bushing wells shall be provided for connection to the distribution system through separable insulated connectors. The bushing wells shall be in accordance with IEEE 386. The minimum current-carrying capability of components for the looped primary cable system shall be 200 A continuous and 3500 A symmetrical (3 s).5.1.3The H2