Standard: IEEE - ANSI C57.12.21

REQUIREMENTS FOR PAD-MOUNTED, COMPARTMENTAL-TYPE SELF-COOLED, SINGLE-PHASE DISTRIBUTION TRANSFORMERS WITH HIGH VOLTAGE BUSHINGS; HIGH-VOLTAGE, 34500 GRYD/19920 VOLTS AND BELOW; LOW-VOLTAGE, 240/120 VOLTS; 167 KVA AND SMALLER

This standard is available for individual purchase.

or unlock this standard with a subscription to IHS Standards Expert

IHS Standards Expert subscription, simplifies and expedites the process for finding and managing standards by giving you access to standards from over 370 standards developing organizations (SDOs).

FEATURES & BENEFITS
  • Maximize product development and R&D with direct access to over 1.6 million standards
  • Discover new markets: Identify unmet needs and discover next-generation technologies
  • Improve quality by leveraging consistent standards to meet customer and market requirements
  • Minimize risk: Mitigate liability and better understand compliance regulations
  • Boost efficiency: Speed up research, capture and reuse expertise
For additional product information, visit the IHS Standards Expert page.

HOW TO SUBSCRIBE
For more information or a custom quote, visit the IHS Contact Us page for regional contact information.
Scope:

Foreward

The Accredited Standards Committee on Transformers, Regulators, and Reactors, C57, has for a number of years been developing and correlating standards on transformers and regulators. The data used in this work have been gathered from many sources, including the standards of the Institute of Electrical and Electronics Engineers and the National Electrical Manufacturers Association, reports of committees of the Edison Electric Institute, and others.

This standard was prepared by the Working Group of the Subcommittee on Distribution Transformers, Overhead and Pad-Mounted, C57.12.2, and is a revision of the 1986 edition. Added to this revision are sections on storage and installation with emphasis being placed on the actual position when stored and the consideration of the angle of tilt when installed.

Scope

This standard is intended for use as a basis for determining performance, interchangeability, and safety of the equipment covered, and to assist in the proper selection of such equipment.

This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of single-phase, 60 Hz, mineral-oil-immersed, self-cooled, padmounted, compartmental-type distribution transformers with high-voltage bushings. These transformers are rated 167 kVA and smaller, with high-voltages of 34500 GRD/19900 volts and below for operation between one phase and grounded neutral, and low-voltage of 240/120 volts. These transformers are generally used for step-down purposes from an underground primary cable supply.

NOTEā€”Refer to latest federal regulations concerning polychlorinated biphenyl (PCB) contaminations in transformers.

This standard covers bushing and terminal arrangements for both radial and loop feed systems.

This standard does not cover the electrical and mechanical requirements of any accessory devices that may be supplied with the transformer.

Organization: The Institute of Electrical and Electronics Engineers, Inc.
Document Number: ansi c57.12.21
Publish Date: 1992-01-01
Page Count: 17
Available Languages: EN
DOD Adopted: NO
ANSI Approved: YES
Most Recent Revision: YES
Current Version: YES
Status: Active

Document History

Document # Change Type Update Date Revision Status
ANSI C57.12.21 Change Type: STCH Update Date: 1980-01-01 Revision: 80 Status: INAC

Standards That Reference This Standard

Showing 8 of 8.


Advertisement
Advertisement
Advertisement
Advertisement