IEEE C57.12.20-2011
$56.33
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 | 2011 | 55 |
Revision Standard – Superseded. 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 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 C57.12.20-2011 Front Cover |
| 3 | Title page |
| 6 | Introduction Notice to users Laws and regulations |
| 7 | Copyrights Updating of IEEE documents Errata Interpretations Patents |
| 8 | Participants |
| 10 | Contents |
| 11 | List of tables |
| 12 | List of figures |
| 13 | Important Notice 1. Overview 1.1 Scope 1.2 Purpose 2. Normative references |
| 14 | 3. Definitions 4. Ratings 4.1 Kilovolt-ampere ratings |
| 15 | 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 |
| 16 | 7.1 Bushings and terminals 7.1.1 Bushings 7.1.2 Terminals 7.1.2.1 High-voltage terminals 7.1.2.2 Low-voltage terminals 7.1.3 Neutral termination |
| 17 | 7.1.4 Terminal boards 7.2 Accessory equipment 7.2.1 Tap changer for de-energized operation 7.2.2 Series-multiple connections 7.2.3 Liquid-level marking |
| 18 | 7.2.4 Lifting lugs 7.2.5 Relief of excessive pressure 7.2.5.1 Pressure-relief valve |
| 19 | 7.2.5.2 Cover assembly 7.2.6 Enclosure integrity 7.2.6.1 Static pressure 7.2.6.2 Dynamic pressure 7.3 Polarity, terminal markings, and angular displacement 7.3.1 Polarity 7.3.2 Angular displacement 7.3.3 Terminal markings |
| 20 | 7.3.4 Instruction nameplate 7.3.4.1 Location 7.3.4.2 Type 7.3.4.3 Material 7.3.5 Kilovolt-ampere rating on tank 7.3.6 Connections for shipment by the manufacturer |
| 21 | 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 7.5.4.1 Tank grounding provision 7.5.4.2 Tank grounding connector 7.5.4.3 Low-voltage grounding connection 7.5.4.4 Low-voltage grounding provision |
| 22 | 7.5.4.5 Lightning arrester mounting provision 7.5.4.6 Static cover bond 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 |
| 23 | 9.2 General requirements 9.3 Test duties 9.4 Test duty 1—An arcing fault in an enclosure 9.4.1 First test |
| 24 | 9.4.2 Second test 9.5 Test duty 2—For enclosures with internal fusible elements 9.5.1 “A” test 9.5.2 “B” test 9.6 Test results |
| 48 | Annex A (informative) Auxiliary mounting devices |
| 54 | Annex B (informative) Flow chart for fault current capability tests |
| 55 | Annex C (informative) Bibliography |
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