Rating of transformer(s) shall be as follows: 1. kVA ............ ......................... 2000 (55°C) / 2240 (65°C) kVA 2. Primary Voltage ... ......................... 12470 V Delta 3. BIL ............ ......................... 95 kV 4. Secondary Voltage ........................ 480/277 V Wye 5. Target Impedance ......................... 5.75% +/- 0.25% 6. Temperature Rise ......................... 55°C (over 30°C average ambient temperature) CONSTRUCTION A. Transformer(s) shall: 1. Be compartmental type, self-cooled, tamper-resistant and weatherproof. 2. Include sealed tank construction to withstand pressure of 105 kPa(15 psi). 3. Include welded cover. NCP Modernization Chiller Replacement Project No. 19223-00 University of Arkansas PAD-MOUNTED, LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS 2024.09.25 26 1219 - 3 B. Transformer tank and primary and secondary voltage compartments shall be assembled as integral unit. C. Primary and secondary voltage compartments shall be located side by side, separated by a steel barrier. D. Cooling panels will be provided on back of tank. E. Primary voltage compartment shall not be accessible until secondary voltage door has been opened. F. Secondary voltage door shall have 3-point latching mechanism with vault type handle having provisions for single padlock. G. Provide lifting eyes and jacking pads. H. Include tank grounding provisions in each compartment...
