IEEE C57.12.51-2008
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
IEEE Standard for Ventilated Dry- Type Power Transformers, 501 kVA and Larger, Three-Phase, with High- Voltage 601 V to 34 500 V; Low- Voltage 208Y/120 V to 4160 V- General Requirements
09-09-2019
English
03-09-2009
1 Overview
1.1 Scope
1.2 Purpose
2 Normative references
3 Definitions
4 Usual service conditions
5 Ratings and characteristics
5.1 Kilovolt-ampere ratings
5.2 Kilovolt-ampere and voltage ratings
5.3 Taps
5.4 Insulation levels
5.5 Angular displacement and terminal markings
5.6 Percent impedance voltage
6 Construction
6.1 Insulation system
6.2 Accessory location
6.3 Nameplate
6.4 Transformer connections
6.5 Tap changing
6.6 Lifting, jacking, and moving facilities
6.7 Ground pad
6.8 Transformer enclosure
7 Routine tests
8 Tolerances
9 Other ratings and characteristics
9.1 Forced-air-cooled ratings
9.2 40 Degree C average ambient temperature conditions
9.3 Other winding temperature rises
9.4 Other temperature class insulation systems
9.5 Other high-voltage ratings and connections
9.6 Y-Y connected transformers
9.7 Increased neutral insulation
9.8 Other basic lightning impulse insulation levels
10 Other construction
10.1 High-voltage connection arrangements
10.2 Low-voltage connection arrangements
10.3 Surge arresters
10.4 Unit substation application
10.5 Temperature devices
10.6 Forced-air cooling
10.7 Provision for future forced-air cooling
10.8 Space heaters
10.9 Current transformers (or provision for their addition
in the future)
10.10 Terminal blocks
10.11 Contacts
11 Other tests
Annex A (informative) Bibliography
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