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ANSI C57.12.40
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ANSI C57.12.40 2011 Edition, December 7, 2011 Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 GrdY/ 19 920 and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed)
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Description / Abstract:
This standard covers certain electrical, dimensional, and
mechanical characteristics and takes into consideration certain
safety features of three-phase, 60-Hz, liquid-immersed,
self-cooled, network transformers with a primary grounding switch.
These transformers are rated 2500 kVA and below with high voltages
of 34 500GrdY/19 920 volts and below. These transformers are
generally used for step-down purposes from underground primary
cables and supply a secondary network system through network
protectors. These transformers are typically installed below ground
level.
Purpose
This standard is intended for use as a basis for establishing the performance, electrical and mechanical interchangeability, safety of the equipment covered, and to assist in the proper selection of such equipment.
Purpose
This standard is intended for use as a basis for establishing the performance, electrical and mechanical interchangeability, safety of the equipment covered, and to assist in the proper selection of such equipment.