IEEE ANSI C57.12.20 2003
$18.96
American National Standard for Transformers – Standard for Overhead Type Distribution Transformers, 500 kVA and Smaller: High Voltage 34500 Volts and Below: Low Voltage, 7970/13800Y Volts and Below
| Published By | Publication Date | Number of Pages |
| IEEE | 2003 | 51 |
New IEEE Standard – Inactive – Superseded. Superseded by IEEE Std C57.12.20-2005.This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of single- and three-phase, 60-Hz, mineral-oil-immersed, self-cooled, overhead-type distribution transformers 500 kVA and smaller, with high voltages 34500 volts and below and low voltages 7970/13800Y volts and below. Such transformers may include one or more of the following features: 1) High-voltage, overcurrent protection; 2) High-voltage, overvoltage protection. 3) Low-voltage, overcurrent protection; 4) Low-voltage, overvoltage protection
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | Title Page |
| 3 | Introduction Participants |
| 5 | CONTENTS |
| 7 | 1. Scope 2. References and related publications 2.1 Referenced American National Standards |
| 8 | 2.2 Related publications 3. Ratings 3.1 Kilovolt-ampere ratings 3.2 Voltage ratings and tap ratings |
| 11 | 4. Basic lightning impulse insulation level and dielectric test levels 5. Tests 5.1 General 5.2 Dielectric tests |
| 12 | 6. Construction |
| 14 | 6.1 Bushings and terminals |
| 26 | 6.2 Accessory equipment |
| 30 | 6.3 Polarity, terminal markings, and angular displacements |
| 42 | 6.4 Oil preservation 6.5 Tanks |
| 43 | 7. Storage and installation 7.1 Storage 7.2 Insulation 8. Design tests for fault current capability of overhead distribution transformer enclosres 8.1 Objective |
| 44 | 8.2 Definitions 8.3 General requirements 8.4 Tests 8.5 Test number 1—an arcing fault in an enclosure |
| 45 | 8.6 Test number 1—for enclosures with internal fusible elements 8.7 Test results |
| 46 | Annex A—Auxiliary mounting devices |
