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IEEE - ANSI C57.12.20

Standard for Overhead Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34500 Volts and Below; Low Voltage, 7970/13800Y Volts and Below

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Organization: IEEE
Publication Date: 9 June 2005
Status: inactive
Page Count: 48
scope:

This standard covers certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase, 60 Hz, mineral-oil-immersed, self-cooled, overhead-type distribution transformers 500 kVA and smaller, high voltages 34 500 V and below and low voltages 7970/13 800Y V and below.

Document History

C57.12.20
September 21, 2023
Overhead-Type Distribution Transformers 500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
This standard covers certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase, 60-Hz, liquid-immersed, self-cooled, overhead-type distribution...
ANSI C57.12.20
September 28, 2017
Overhead-Type Distribution Transformers 500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
This standard covers certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase. 60 Kz. liquid-immersed, self-cooled, overhead-type distribution...
ANSI C57.12.20
June 16, 2011
Overhead-Type Distribution Transformers 500 kVA and Smaller: High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
This standard covers certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase, 60-Hz, mineral-oil-immersed, self-cooled, overhead-type...
ANSI C57.12.20
April 1, 2008
Overhead-Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
This standard covers certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase, 60 Hz, mineral-oil-immersed, self-cooled, overhead-type...
ANSI C57.12.20
June 9, 2005
Standard for Overhead Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34500 Volts and Below; Low Voltage, 7970/13800Y Volts and Below
This standard covers certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase, 60 Hz, mineral-oil-immersed, self-cooled, overhead-type...
ANSI C57.12.20
January 1, 1997
Standard for Overhead Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34500 Volts and Below: Low Voltage, 7970/13800Y Volts and Below
This standard is intended for use as a basis for determining the performance, interchangeability, and safety of the equipment covered, and to assist in the proper selection of such equipment. This...
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References

This document references:
IEEE C57.91 - Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators
Published by IEEE on December 7, 2011
This guide provides recommendations for loading mineral-oil-immersed transformers and step-voltage regulators with insulation systems rated for a 65 °C average winding temperature rise at rated load....
This document references:
IEEE C37.40 - Errata to IEEE Standard Service Conditions and Definitions for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories
Published by IEEE on September 11, 2003
This standard applies to high-voltage (above 1000 V) fuses and equipment. This includes distribution class and power class fuses, distribution class enclosed single-pole air switches, distribution...
This document references:
IEEE C37.41 - Design Tests for High-Voltage (>1000 V) Fuses and Accessories
Published by IEEE on September 22, 2016
This standard specifies design test requirements for high-voltage (above 1000 V) fuses and accessories for use on ac electrical distribution systems. Devices with rated maximum voltages to 170 kV are...
This document references:
IEEE C57.12.00 - General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers
Published by IEEE on December 5, 2015
This standard describes electrical and mechanical requirements of liquid-immersed distribution and power transformers, and autotransformers and regulating transformers, single-phase and polyphase,...
This document references:
IEEE C57.12.31 - Pole-Mounted Equipment—Enclosure Integrity
Published by IEEE on December 3, 2020
This standard covers conformance tests and requirements for the enclosure integrity of pole-mounted electrical equipment containing apparatus energized in excess of 600 V. These enclosures contain...
This document references:
IEEE C57.12.70 - Standard Terminal Markings and Connections for Distribution and Power Transformers
Published by IEEE on September 24, 2020
This standard defines the terminal markings and connections for distribution, power, and regulating transformers covered in the IEEE C57™ series of standards, guides, and recommended practices....
This document references:
IEEE C57.12.90 - Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers
Published by IEEE on December 5, 2015
This standard describes methods for performing tests specified in IEEE Std C57.12.00™1 and other standards applicable to liquid-immersed distribution, power, and regulating transformers. It is...
This document references:
IEEE C57.91 - Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators
Published by IEEE on December 7, 2011
This guide provides recommendations for loading mineral-oil-immersed transformers and step-voltage regulators with insulation systems rated for a 65 °C average winding temperature rise at rated load....
View Less
View All

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