IEEE C57.12.40 2006

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Standard for Requirements for Secondary Network Transformers, Subway and Vault Types (Liquid-Immersed)

Published By	Publication Date	Number of Pages
IEEE	2006	27

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Description

Revision Standard – Active. This standard is intended for use as a basis for establishing the performance,interchangeability, and safety of the equipment covered and to assist in the proper selection of such equipment.

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PDF Pages	PDF Title
1	IEEE Standard Requirements for Secondary Network Transformers, Subway and Vault Types (Liquid Immersed)
3	Title page
6	Introduction Notice to users Errata Interpretations Patents Participants
8	Contents
9	IEEE Standard Requirements for Secondary Network Transformers, Subway and Vault Types (Liquid Immersed) 1. Overview 1.1 Scope 1.2 Purpose 2. Normative references
10	3. Transformer performance requirements 3.1 Kilovolt-ampere ratings
11	3.2 Voltage rating and tap ratings 3.3 Angular displacement 3.4 Basic lightning impulse insulation levels (BILs) 3.5 Percent impedance
12	3.5.1 Tolerance on impedance on a tap 3.6 Audible sound levels 4. Tests 5. Primary disconnect and grounding switch 5.1 General 5.2 Primary switch electrical performance requirements 5.2.1 Continuous rating
13	5.2.2 Short-circuit rating 5.2.3 Interrupting rating 5.2.4 Dielectric requirements in closed position 5.2.5 Dielectric requirements in open position 5.2.6 Electrical interlock
14	5.3 Primary switch mechanical features 5.3.1 Primary switch and cable terminal chamber covers 5.3.2 Primary switch operating positions and sequence
15	5.3.3 Operating handle 5.4 Primary switch accessory equipment 5.4.1 Filling provisions 5.4.2 Air test provision 5.4.3 Liquid-level indicator 5.4.4 Drain provisions 5.5 Primary cable entrance 5.5.1 Wiping sleeves
16	5.5.2 Entrance fittings 5.5.3 Bushings and bushing wells 6. Construction 6.1 General 6.2 Corrosion resistance 6.2.1 Transformer enclosure 6.2.2 Hardware 6.2.3 Other materials 6.2.4 Finish
17	6.3 Tank 6.3.1 General 6.3.2 Transformer with subbase 6.3.3 Secondary throat 6.3.4 Handhole cover 6.3.5 Lifting lugs 6.3.6 Lifting and jacking provisions 6.3.7 Secondary throat shipping guard
18	6.4 Accessory equipment for transformer tanks 6.4.1 Tap changer 6.4.2 Air test provision 6.4.3 Welded-on nongasketed-type magnetic liquid-level indicator 6.4.4 Dial-type thermometer without alarm contacts 6.4.5 Combination drain and bottom filter valve 6.4.6 Filling plug and upper filter press connection 6.4.7 Ground pads
19	6.5 Dimensions
20	7. Bushings 7.1 Primary bushings 7.1.1 Primary bushings between main tank and switch chamber 7.1.2 Primary bushings between switch chamber and terminal chamber 7.1.3 Primary entrance 7.2 Secondary bushings 7.3 Terminal markings 8. Neutral termination 8.1 Primary neutral 8.2 Secondary neutral
21	9. Nameplate 10. Connections of transformer for shipment by manufacturer
27	Annex A (informative) Bibliography

Additional information

Standard Title	Standard for Requirements for Secondary Network Transformers, Subway and Vault Types (Liquid-Immersed)
Published Code	IEEE
Publication Date	2006
Pages Count	27

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IEEE C57.12.40 2006

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