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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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.
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|
|Most Recent Revision:||YES|
|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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