Table of Contents

Foreword
1 Scope
2 References
  2.1 General
3 Ratings
  3.1 Kilovolt-ampere ratings
  3.2 Voltage ratings and tap ratings
4 Basic lightning impulse insulation levels and dielectric
  test levels
5 Tests
  5.1 General
  5.2 Dielectric tests
6 Construction
  6.1 General
  6.2 Bushings and terminals
  6.3 High-voltage and low-voltage compartments
  6.4 Instruction nameplate
  6.5 Oil preservation
  6.6 Tanks
7 Storage and installation
  7.1 Storage
  7.2 Installation
8 Other requirements that may be specified for some applications

Abstract

Describes certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of single-phase, 60 Hz, mineral-oil-immersed, self-cooled, pad-mounted, 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.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN
Supersedes	IEEE DRAFT C57.12.21 : D12 MAY 92