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
Institute of Electrical & Electronics Engineers
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
Presents characteristics relating to performance, limited electrical and mechanical interchangeability, as well as safety of the equipment described, and to assist in the proper selection of such equipment.
| Document Type | Standard |
| Status | Current |
| Publisher | Institute of Electrical & Electronics Engineers |
| Supersedes |
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