Specifications include, but are not limited to: kVA/Thermal Rating: The size in KVA must be as specified in the bid and proposal form. The unit must be designed for the following thermal rise conditions: 65°C continuous average winding temperature rise, 80°C hot spot; 65°C maximum top oil temperature rise. Impedance: Standard per ANSI. Cooling: The transformer must be oil-filled (non-PCB) and air-cooled. The use of cooling fins is not permissible. A modified ASTM Method D1275 A must be performed on bulk oil sources used in manufacture to test the oil against the presence of corrosive sulfur. High Voltage Rating: 13.8 kV Grounded Y/7.97 kV, 95 kV BIL. High Voltage Bushing: Each unit must be supplied with one cover mounted porcelain bushing. Low Voltage Rating: 120/240 volts or 277 volts, 30 kV BIL as specified on the bid and proposal form. The units must be suitable for application in 208Y/120 volts or 480Y/277 volts three phase banks respectively...
