Standard: IEEE - ANSI C57.12.40

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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Scope:

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.

Organization: The Institute of Electrical and Electronics Engineers, Inc.
Document Number: ansi c57.12.40
Publish Date: 2011-12-07
Page Count: 34
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active

Document History

Document # Change Type Update Date Revision Status
ANSI C57.12.40 Change Type: Update Date: 2006-03-30 Revision: 06 Status: INAC
ANSI C57.12.40 Change Type: Update Date: 2000-01-01 Revision: 00 Status: INAC
ANSI C57.12.40 Change Type: Revision: 94 Status: INAC
ANSI C57.12.40 Change Type: Update Date: 1990-05-18 Revision: 90 Status: INAC
ANSI C57.12.40 Change Type: Update Date: 1982-01-01 Revision: 82 Status: INAC

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