IEEE C57.12.50 : 1981

Withdrawn

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REQUIREMENTS FOR VENTILATED DRY-TYPE DISTRIBUTION TRANSFORMERS, 1 TO 500 KVA, SINGLE-PHASE, AND 15 TO 500 KVA, THREE-PHASE, WITH HIGH-VOLTAGE 601 TO 34500 VOLTS, LOW-VOLTAGE 120 TO 600 VOLTS

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Withdrawn date: 17-10-2023

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Published date: 01-01-1981

Publisher: Institute of Electrical & Electronics Engineers

Table of Contents - (Show below) - (Hide below)

1. Scope
    1.1
    1.2
    1.3
    1.4
    1.5
2. Related Standards and Guides
    2.1 General
    2.2 Terminology
    2.3 Revision of American National Standards Referred
         to in This Document
Part I: Basic Electrical and Mechanical Requirements
3. Usual Service Conditions
4. Ratings and Characteristics
    4.1 Kilovolt-Ampere Ratings
    4.2 Kilovolt-Ampere and Voltage Ratings
    4.3 Taps
    4.4 Insulation Levels
    4.5 Polarity, Angular Displacement, and Terminal
         Markings
    4.6 Impedance Voltage
5. Construction
    5.1 Insulation System
    5.2 Accessory Location
    5.3 Nameplate
    5.4 Transformer Connections
    5.5 Tap Changing
    5.6 Lifting Facilities and Stability
    5.7 Grounding Facilities
    5.8 Transformer Enclosure
6. Routine Tests
7. Tolerances
Part II: Other Requirements or Alternatives That May Be
         Specified for Some Applications
8. Other Ratings and Characteristics
    8.1 Other Kilovolt-Ampere Ratings
    8.2 40 degree C Average Ambient Temperature
         Conditions
    8.3 Other Winding Temperature Rises
    8.4 Other Insulation Systems
    8.5 Other High-Voltage Ratings and Connections
    8.6 Y-Y Connected Transformers
    8.7 Increased Neutral Insulation
    8.8 Other Basic Lightning impulse Insulation Levels
         (BILs)
9. Other Construction
    9.1 High-Voltage Connection Arrangements
    9.2 Low-Voltage Connection Arrangements
    9.3 Surge Arresters
    9.4 Unit Substation
    9.5 Temperature Devices
    9.6 Forced-Air Cooling
    9.7 Provision for Future Forced-Air Cooling
    9.8 Space Heaters
    9.9 Current Transformers (or Provision for Their
         Addition in the Future)
    9.10 Terminal Blocks
    9.11 Contacts
    9.12 Jacking and Moving Facilities
10. Other Tests

Abstract - (Show below) - (Hide below)

Defines characteristics relating to performance, limited mechanical and electrical interchangeability, and safety of the equipment described, and to assist in the proper selection of such equipment.

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Document Type	Standard
ISBN
Pages
Published
Publisher	Institute of Electrical & Electronics Engineers
Status	Withdrawn

Standards Referenced By This Book - (Show below) - (Hide below)

IEEE C57.94-1982	IEEE Recommended Practice for Installation, Application, Operation, and Maintenance of Dry-Type General Purpose Distribution and Power Transformers
IEEE C57.12.51-2008	IEEE Standard for Ventilated Dry- Type Power Transformers, 501 kVA and Larger, Three-Phase, with High- Voltage 601 V to 34 500 V; Low- Voltage 208Y/120 V to 4160 V- General Requirements
IEEE DRAFT C57.12.91 : D3 2000	DRAFT STANDARD TEST CODE FOR DRY-TYPE DISTRIBUTION AND POWER TRANSFORMERS
ANSI C57.12.52 : 2012	Sealed Dry-Type Power Transformers, 501 kVA and Higher, Three-Phase, with High-Voltage 601 to 34500 Volts, Low-Voltage 208Y/120 to 4160 Volts—General Requirements
NEMA TR1 : 2013	TRANSFORMERS, STEP VOLTAGE REGULATORS AND REACTORS
IEEE DRAFT C57.12.01 : D6 2005	GENERAL REQUIREMENTS FOR DRY-TYPE DISTRIBUTION AND POWER TRANSFORMERS INCLUDING THOSE WITH SOLID-CAST AND/OR RESIN ENCAPSULATED WINDINGS
ANSI C57.12.57 : 1987	AMERICAN NATIONAL STANDARD FOR TRANSFORMERS - VENTILATED DRY-TYPE NETWORK TRANSFORMERS 2500 KVA AND BELOW, THREE-PHASE, WITH HIGH-VOLTAGE 34500 VOLTS AND BELOW, LOW-VOLTAGE 216Y/125 AND 480Y/227 VOLTS - REQUIREMENTS
IEEE C37.121-2012	GUIDE FOR SWITCHGEAR - UNIT SUBSTATION - REQUIREMENTS
IEEE C57.12.52-2012	IEEE Standard for Sealed Dry-Type Power Transformers, 501 kVA and Higher, Three-Phase, with High-Voltage 601 to 34500 Volts, Low-Voltage 208Y/120 to 4160 Volts—General Requirements
IEEE C57.12.91-2011	IEEE Standard Test Code for Dry-Type Distribution and Power Transformers
IEEE C57.12.70-2011	IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers
IEEE C57.12.56-1986	IEEE Standard Test Procedure for Thermal Evaluation of Insulation Systems for Ventilated Dry-Type Power and Distribution Transformers
IEEE C37.121-2012 REDLINE	IEEE Guide for Switchgear - Unit Substation - Requirements

Standards Referencing This Book - (Show below) - (Hide below)

IEEE C57.12.51-2008	REQUIREMENTS FOR SEALED DRY-TYPE POWER TRANSFORMERS, 501 KVA AND LARGER, THREE-PHASE, WITH HIGH-VOLTAGE 601 TO 34500 VOLTS, LOW-VOLTAGE 208Y/120 TO 4160 VOLTS
IEEE C57.12.01-2015 REDLINE	IEEE Standard for General Requirements for Dry-Type Distribution and Power Transformers
ANSI C57.12.52 : 2012	Sealed Dry-Type Power Transformers, 501 kVA and Higher, Three-Phase, with High-Voltage 601 to 34500 Volts, Low-Voltage 208Y/120 to 4160 Volts—General Requirements
ANSI C84.1 : 2016	ELECTRIC POWER SYSTEMS AND EQUIPMENT - VOLTAGE RATINGS (60 HERTZ)
NFPA 70 : 2017	NATIONAL ELECTRICAL CODE
IEEE C57.12.70-2011	IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers
IEEE C57.12.91-2011	IEEE Standard Test Code for Dry-Type Distribution and Power Transformers
IEEE C57.94-1982	IEEE Recommended Practice for Installation, Application, Operation, and Maintenance of Dry-Type General Purpose Distribution and Power Transformers
IEEE C57.105-1978	IEEE Guide for Application of Transformer Connections in Three-Phase Distribution Systems

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