IEEE DRAFT C57.12.20 : D10C 2004

Name: IEEE DRAFT C57.12.20 : D10C 2004
Brand: IEEE

Withdrawn

OVERHEAD TYPE DISTRIBUTION TRANSFORMERS, 500 KVA AND SMALLER: HIGH VOLTAGE, 34 500 VOLTS AND BELOW; LOW VOLTAGE, 7970/13 800Y VOLTS AND BELOW

Withdrawn date

10-17-2023

Published date

01-12-2013

Publisher

Institute of Electrical & Electronics Engineers

Introduction
1 Overview
  1.1 Scope
  1.2 Purpose
2 References
3 Definitions
  3.1 A Fault
  3.2 A Test
  3.3 Back-Up Protection
  3.4 Enclosures
  3.5 Internal Fusible Element
4 Ratings
  4.1 Kilovolt-Ampere Ratings
  4.2 Voltage Ratings and Tap Ratings
5 Basic Lightning Impulse Insulation Levels and Dielectric
  Test Levels
  5.1 Basic Lightning Impulse
  5.2 Dielectric Test
6 Tests
  6.1 General
  6.2 Dielectric Tests
7 Construction
  7.1 Bushings and Terminals
      7.1.1 Bushings
      7.1.2 Terminals
      7.1.3 Neutral Termination
      7.1.4 Terminal Boards
  7.2 Accessory Equipment
      7.2.1 Tap Changer
      7.2.2 Series-Multiple Connections
      7.2.3 Liquid-Level Marking
      7.2.4 Lifting Lugs
      7.2.5 Relief of Excessive Pressure
      7.2.6 Enclosure Integrity
  7.3 Polarity, Terminal Markings, and Angular Displacement
      7.3.1 Polarity
      7.3.2 Angular Displacement
      7.3.3 Terminal Markings
      7.3.4 Instruction Nameplate
      7.3.5 Kilovolt-Ampere Rating on Tank
      7.3.6 Connections for Shipment by the Manufacturer
  7.4 Oil Preservation
  7.5 Tanks
      7.5.1 Covers and Handholes
      7.5.2 Support Lugs
      7.5.3 Tank Finish
      7.5.4 Tank Grounding Provisions
8 Storage and Installation
  8.1 Storage
  8.2 Installation
9 Design Tests for Fault Current Capability of Overhead
  Distribution Transformer Enclosures
  9.1 Objective
  9.2 General Requirements
  9.3 Tests
  9.4 Test Number 1- An Arcing Fault in an Enclosure
      9.4.1 First Fault
      9.4.2 Second Fault
  9.5 Test Number 2- For Enclosures with Internal Fusible Elements
      9.5.1 "A" Fault
      9.5.2 "B" Fault
  9.6 Test Results
Tables
Figures
Annex A (informative) Auxiliary Mounting Devices
Figure A.1 Support Lug C
Figure A.2 Type C Adapter Plates
Figure A.3 T-Crossarm Hangers and Kickers (T1 and K1)
Figure A.4 T-Crossarm Hangers and Kickers (T2 and K2)
Figure A.5 Crossarm Hangers
Annex B (informative) Bibliography

Describes 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 volts and below and Low Voltages 7970/13 800Y volts and below.

DocumentType	Draft
PublisherName	Institute of Electrical & Electronics Engineers
Status	Withdrawn

NEMA TR1 : 2013	TRANSFORMERS, STEP VOLTAGE REGULATORS AND REACTORS
NEMA MG 2:2014	Safety Standard for Construction and Guide for Selection, Installation and Use of Electric Motors and Generators
IEEE C57.12.00-2015	IEEE Standard for General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers
IEEE C57.91-2011 REDLINE	IEEE Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators
IEEE C135.1-1999	IEEE Standard for Zinc-Coated Steel Bolts and Nuts for Overhead Line Construction
IEEE C57.12.90-2010	IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers
IEEE C37.40-2003	IEEE Standard Service Conditions and Definitions for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories
IEEE C57.12.31-2010	IEEE Standard for Pole-Mounted Equipment--Enclosure Integrity
IEEE C57.12.70-2011	IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers
IEEE C37.41-2008 REDLINE	IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses, Fuse and Disconnecting Cutouts, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Fuse Links and Accessories Used with These Devices
MIL-STD-209 Revision K:2005	LIFTING AND TIEDOWN PROVISIONS

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IEEE DRAFT C57.12.20 : D10C 2004

OVERHEAD TYPE DISTRIBUTION TRANSFORMERS, 500 KVA AND SMALLER: HIGH VOLTAGE, 34 500 VOLTS AND BELOW; LOW VOLTAGE, 7970/13 800Y VOLTS AND BELOW

Table of Contents

Abstract

General Product Information

Standards Referencing This Book

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