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Revision 91M, 1991

Complete Document

Single-Phase and Three-Phase Distribution Transformers, Types ONAN and LNAN

Includes all amendments and changes through Reaffirmation Notice , 2003

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Superseded By: CSA C2.1

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Product Details:

  • Revision: Revision 91M, 1991
  • Published Date: January 2003
  • Status: Superseded By:
  • Superseded By: CSA C2.1
  • Document Language: English
  • Published By: CSA Group (CSA)
  • Page Count: 51
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This Standard specifies the requirements for distribution transformers intended primarily for operation by electric utilities.

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 under Part I of the Canadian Electrical Code.

This Standard applies to single- and three-phase, 60 Hz, liquid-filled, distribution transformers, Types ONAN and LNAN, rated at 1000 kV•A or below for single-phase and at or below 3000 kV•A for three-phase, insulation class 34.5 kV and less.

This Standard includes voltage ratings, kV•A ratings, certain mechanical characteristics, and test procedures. Also included are the following performance characteristics: temperature rise, loading capabilities, sound level, and radio influence voltage (RIV).

This Standard also applies to self-protected transformers, except for the protective equipment.

Except as specified by other CSA Standards this Standard does not apply to auto-, testing, dry-type, welding, furnace, rectifier, network, pad-mounted, subway-type, or special-purpose transformers, or to step-voltage regulators.

Transformers built in accordance with this Standard shall meet the quality requirements of CSA Standard CAN3-2299.3.