IEEE C57.12.38-2014

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IEEE Standard for Pad-Mounted-Type, Self-Cooled, Single-Phase Distribution Transformers 250 kVA and Smaller: High Voltage, 34 500 GrdY/19 920 V and Below; Low Voltage, 480/240 V and Below

Published By	Publication Date	Number of Pages
IEEE	2014

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Description

Revision Standard – Active. Certain electrical, dimensional, and mechanical characteristics are covered in this standard, and certain safety features of single-phase, 60-Hz, mineral-oil-immersed, self-cooled, pad-mounted, compartmental-type distribution transformers are taken into consideration. These transformers are rated 250 kVA and smaller with high voltages of 34 500 GrdY/19 920 V and below and with low voltages of 480/240 V and below. These transformers are generally used for step-down purposes from an underground primary cable supply. The connector, bushing, and terminal arrangements for radial or loop feed systems are covered in this standard. The electrical and mechanical requirements of any accessory devices that may be supplied with the transformer are not covered in this standard.

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PDF Pages	PDF Title
1	IEEE Std C57.12.38™-2014 Front Cover
3	Title page
5	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
11	Contents
13	Important Notice 1. Overview 1.1 Scope
14	1.2 Purpose 2. Normative references 3. Definitions
15	4. Ratings 4.1 Kilovolt-ampere ratings 4.2 Voltage ratings
16	4.3 Tap ratings 5. Basic lightning impulse insulation levels
17	6. Tests 6.1 General 6.2 Dielectric tests 6.3 Chopped wave 7. Construction 7.1 General 7.2 Compartment configuration 7.3 Access 7.4 High-voltage and low-voltage compartments
18	7.5 Pad attachment
26	7.6 Lifting 8. Connectors, bushings, and terminals 8.1 Electrical characteristics 8.2 High-voltage terminals
27	8.3 Low-voltage terminals 8.4 Designations
31	9. Instruction nameplate 9.1 Location 9.2 Information
32	10. Oil preservation 10.1 Tank construction 10.2 Strength 10.3 Pressure testing and oil access 10.4 Tank covers 11. Pressure relief valve
33	12. Grounding and lightning arrester attachment provisions 12.1 Grounding provisions 12.2 Lightning arrester attachment 13. Components for loop primary cable systems 14. Storage 15. Installation 16. Other requirements that may be specified for some applications
34	Annex A (informative) Bibliography

Additional information

Standard Title	IEEE Standard for Pad-Mounted-Type, Self-Cooled, Single-Phase Distribution Transformers 250 kVA and Smaller: High Voltage, 34 500 GrdY/19 920 V and Below; Low Voltage, 480/240 V and Below
Published Code	IEEE
Publication Date	2014

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IEEE C57.12.38-2014

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