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IEEE C57.12.40-2017

IEEE C57.12.40-2017

$28.75

IEEE Standard for Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed)

Published By Publication Date Number of Pages
IEEE 2017
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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.

PDF Catalog

PDF Pages PDF Title
1 IEEE Std C57.12.40-2017 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. Transformer performance requirements
3.1 Kilovolt-ampere ratings
13 3.2 Voltage rating and tap ratings
3.3 Angular displacement
14 3.4 Basic lightning impulse insulation levels (BILs)
3.5 Percent impedance
3.5.1 Tolerance for impedance on a tap
3.6 Audible sound levels
4. Tests
15 5. Construction
5.1 General
5.2 Corrosion resistance
5.2.1 Transformer enclosure
16 5.2.2 Hardware
5.2.3 Other materials
5.2.4 Finish
5.3 Tank
5.3.1 General
5.3.2 Transformer with sub-base
5.3.3 Covers
17 5.3.4 Lifting lugs
5.3.5 Lifting and jacking provisions
5.4 Cooling panels
5.5 Primary switch chamber
5.5.1 Primary switch chamber cover
5.5.1.1 Switch chamber fluid
5.5.2 Primary switch operating positions markings
5.5.3 Operating handle
18 5.5.4 Switch chamber
5.5.5 Primary switch accessory equipment
5.5.5.1 Filling provisions
5.5.5.2 Air test provision
5.5.5.3 Liquid-level indicator
5.5.5.4 Drain provisions
5.6 Secondary network protector throat
19 5.6.1 Secondary throat shipping guard
5.7 Accessory equipment for transformer tanks
5.7.1 Tap changer
5.7.2 Air test provision
5.7.3 Welded-on non-gasketed-type magnetic liquid-level indicator
5.7.4 Dial-type thermometer without alarm contacts
20 5.7.5 Combination drain and bottom filter valve
5.7.6 Filling plug and upper filter press connection
5.7.7 Ground pads
5.8 Dimensions
22 6. Primary disconnect and grounding switch
6.1 General
6.2 Network switch electrical performance requirements
6.2.1 Continuous rating
6.2.2 Short circuit rating
6.2.2.1 Short circuit thermal withstand
6.2.2.2 Peak withstand asymmetric current
23 6.2.2.3 Network switch short circuit test pass/fail criteria
6.2.2.4 Ground circuit short circuit test
6.2.2.5 Network switch closed position short circuit test
24 6.2.2.6 System short circuit peak value criteria
6.2.2.7 Network switch and chamber safety criteria
6.2.3 Interrupting rating
6.2.3.1 No interrupting rating (dead break)
6.2.3.2 Magnetizing current interrupting rating (mag-break)
6.2.4 Dielectric requirements in closed position
25 6.2.5 Dielectric requirements in open position
6.2.6 Electrical interlock
6.2.6.1 Interlock protection when no interrupting rating is required
6.2.6.2 Interlock protection when magnetizing current interruption is required
6.2.6.3 Interlock testing
6.2.6.4 Operating values
26 6.2.6.5 Interlock assembly
7. Bushings
7.1 Bushings and bushing wells
7.2 Primary bushings between main tank and switch chamber
7.3 Secondary bushings
7.3.1 Secondary flexible connectors
27 7.4 Terminal markings
8. Neutral termination
8.1 Primary neutral
8.2 Secondary neutral
28 9. Nameplate
10. Connections of transformer for shipment by manufacturer
34 Annex A (informative) Bibliography
35 Annex B (informative) Coordination of bushing selection and application
37 Back cover

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IEEE C57.12.40-2017
$28.75