IEEE C57.12.20-2023
$42.25
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 (Approved Draft)
| Published By | Publication Date | Number of Pages |
| IEEE | 2023 |
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 C57.12.20ā¢-2023 Front cover |
| 2 | Title page |
| 4 | Important Notices and Disclaimers Concerning IEEE Standards Documents |
| 8 | Participants |
| 10 | Introduction |
| 11 | Contents |
| 12 | List of tables List of figures |
| 13 | 1. Overview 1.1 Scope 1.2 Purpose 1.3 Word usage |
| 14 | 2. Normative references 3. Definitions 4. Ratings 4.1 Kilovoltampere ratings |
| 15 | 4.2 Voltage ratings and tap ratings 4.3 Minimum percent impedance voltage 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 |
| 16 | 7. Construction 7.1 Bushings and terminals |
| 17 | 7.2 Accessory equipment |
| 18 | 7.3 Connections and markings 7.4 Liquid insulation system |
| 19 | 7.5 Tanks |
| 20 | 7.6 Tank pressure requirements |
| 21 | 7.7 Instruction nameplate 8. Storage and installation 8.1 Storage 8.2 Installation |
| 43 | Annex A (informative)Auxiliary mounting devices |
| 49 | Annex B (informative)Cover insulation testing B.1 Cover B.2 Test procedures |
| 52 | B.3 Coating thickness measurement and coating type |
| 53 | Annex C (informative)Bibliography |
| 54 | Back cover |
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