Specifications include, but are not limited to: 2.7.1 Item #1. Provide one (1) each pad-mounted transformer and required accessories per the following specifications (Vet Diagnostic Laboratory Phase 2): A. Outdoor, biodegradable dielectric insulating Cargill Envirotemp FR3 fluid filled, sealed tank, self-cooled, distribution class, pad-mounted, paint color to be ANSI green. B. 2000 kVA, all windings will be copper. Aluminum windings will not be allowed. C. Voltage: 13,800 volts delta to 480/277 volts grounded wye, 3 phase, 4 wire, 60 Hz. D. Transformer shall have a 55/65 degree C temperature rise rating. Windings shall not exceed 55 degree C temperature rise at 2000 kVA and shall be capable of 2240 kVA at 65 degree C temperature rise. E. Insulation level, high voltage winding, 95 KV BIL. F. Insulation level, low voltage winding, 30 KV BIL. G. Impedance: minimum of 5.75%. H. No-load voltage taps: four (4) 2-1/2%; two (2) above and two (2) below rated primary voltage. I. Primary fusing: none required. J. High-voltage cable terminations: live-front arranged for radial feed. Three sidewallmounted externally clamped porcelain bushings with blade terminals, NEMA 2 hole spacing. K. Low-voltage cable terminations: sidewall-mounted externally clamped epoxy or porcelain bushings with blade terminals, NEMA 12 hole spacing minimum. Neutral bushing shall be fully insulated with removable ground strap connected to transformer tank. Provide bushing supports. L. Terminal compartment shall be bolt-on, minimum of 30” deep, with hinged lift-off doors and HV/LV compartment barrier. High-voltage internal compartment shall be a minimum of 35” wide, and low-voltage internal compartment shall be a minimum of 30” wide. All lengths are considered inside compartment dimensions. M. High-voltage compartment door shall have a pentahead bolt fastening device accessible only through the low-voltage door. Terminal compartment door shall be 3-point latching with dual function padlock provisions. Dual function padlocking shall consist of a combination of a retained pentahead bolt that must be fully engaged before padlock shackle can be inserted. The padlock will secure the door through-point latching handle and block access to the door release pentahead bolt. N. Provide three (3) each Distribution Class Metal Oxide Surge Arrestors, heavy duty, nominally rated 10 kV, with an 8.4 kV MCOV-mounted in high voltage compartment below primary bushings. Arrestors shall be connected to the respective primary bushing with 15 kV unshielded and insulated copper conductors. O. Provide all transformer accessories and testing per the Additional Specifications as noted in section 2.7.3.
