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)
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.