 |
| Purchase Information |
| Use this form to request purchase information on NEMA online subscriptions. |
|
|
Document NEMA C57.12.51 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
You may also purchase this document alone from the IHS Standards Store.
NEMA C57.12.51 Document Information:
Title
Ventilated Dry-Type Power Transformers, 501 kVA and Larger, Three-Phase, with High-Voltage 601 to 34 500 Volts, Low-Voltage 208Y/120 to 4160 Volts, Requirements for
National Electrical Manufacturers Association
Publication Date:
Jan 1, 1981
Scope:
This standard is intended to set forth characteristics relating to performance, limited electrical and mechanical interchangeability, and safety of the equipment described, and to assist in the proper selection of such equipment.
This standard describes certain electrical and mechanical characteristics and takes into consideration certain safety features of 60-Hz, two-winding, threephase, ventilated dry-type transformers with selfcooled ratings 501 kVA and larger, generally used for step-down purposes. Forced-air-cooled ratings for certain sizes are listed in Part II.
Specific rating combinations are described in the range from 750/1000 to 7500/10 O00 kVA inclusive, with high-voltage 2400 to 34 500 volts inclusive and low-voltage 208Y/120 to 4160 volts inclusive.
This standard does not apply to other types of transformers such as specialty, ventilated dry-type 500 kVA and smaller, sealed dry-type, pad-mounted dry-type, liquid immersed, instrument, regulating, furnace, mine, and rectifier transformers. Transformers with high voltage 600 volts or less are excluded.
When this standard is used on a mandatory basis, the word “shall” indicates mandatory requirements, and the words “should” and “may” refer to matters that are recommended and permissive, respectively, but not mandatory.
NOTE: The Foreword of this standard describes the circumstances under which the document may be used on a mandatory basis.
Part I of this standard describes electrical and mechanical requirements. Part II describes other requirements or alternatives which may be specified for some applications.
About IHS
IHS (NYSE: IHS) is a leading global provider of critical technical information, decision-support tools and related services in a number of industries including aerospace and defense, automotive, construction, electronics, and energy. IHS serves customers ranging from large governments and multinational corporations to smaller companies and technical professionals in more than 100 countries. IHS been in business for more than 45 years and employ more than 2,300 people around the world.
