3-Phase Step Down Transformer

The U.S. Navy is seeking a single, custom‑built, marine‑grade, 3‑phase step‑down transformer rated at 27 kVA or higher for installation in a Naval Conex box on civilian research vessels. The unit must meet MIL‑T‑15108C, be Delta‑Delta wound, support 480 VAC primary (Delta, no neutral) and 115 VAC secondary (Delta, no neutral), and provide two 115 VAC 3‑phase 30 A outputs plus one 115 VAC single‑phase 30 A output, all independently fused. The transformer must be new, comply with shipboard grounding/bonding requirements, and accommodate input variations (460 VAC, 440 VAC, etc.) via primary taps. No brand or model is specified; vendors must submit a quotation for a product meeting all mandatory specifications. • Marine‑grade, custom transformer ≥ 27 kVA, MIL‑T‑15108C compliant • Primary: 480 VAC 3‑phase Delta, optional taps for 460/440 VAC • Secondary: 115 VAC 3‑phase Delta, closed‑Delta, no neutral • Outputs: two 115 VAC 3‑phase 30 A circuits + one 115 VAC single‑phase 30 A circuit (phase‑to‑phase) • Independent fusing for each output, new unit only • Must meet shipboard grounding/bonding and chassis‑to‑ship bonding requirements • No specific manufacturer; quotation required for a unit meeting all criteria.