IEEE C57.12.20-2017
$47.13
IEEE Standard for Overhead-Type Distribution Transformers 500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
| Published By | Publication Date | Number of Pages |
| IEEE | 2017 |
Revision Standard – Active. Certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase, 60 Hz, liquid-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 are covered in this standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | IEEE Std C57.12.20™-2017 Front cover |
| 2 | Title page |
| 4 | Important Notices and Disclaimers Concerning IEEE Standards Documents |
| 7 | Participants |
| 9 | Introduction |
| 10 | Contents |
| 11 | 1. Overview 1.1 Scope 1.2 Purpose 2. Normative references |
| 12 | 3. Definitions 4. Ratings 4.1 Kilovolt-ampere ratings 4.2 Voltage ratings and tap ratings 4.3 Minimum percent impedance voltage |
| 13 | 5. Basic lightning impulse insulation levels and dielectric test levels 5.1 Basic lightning impulse insulation levels 5.2 Dielectric test levels 6. Tests 6.1 General 6.2 Dielectric tests 7. Construction 7.1 Bushings and terminals |
| 14 | 7.2 Accessory equipment |
| 17 | 7.3 Polarity, terminal markings, and angular displacement |
| 18 | 7.4 Liquid preservation 7.5 Tanks |
| 19 | 8. Storage and installation 8.1 Storage |
| 20 | 8.2 Installation 9. Design tests for fault current capability of overhead distribution transformer enclosures 9.1 Objective 9.2 General requirements 9.3 Test duties |
| 21 | 9.4 Test duty 1—An arcing fault in an enclosure 9.5 Test duty 2—For enclosures with internal fusible elements |
| 22 | 9.6 Test results |
| 44 | Annex A (informative) Auxiliary mounting devices |
| 50 | Annex B (informative) Flow chart for fault current capability tests |
| 51 | Annex C (informative) Bibliography |
| 52 | Back cover |
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