3 Phase Step Down Transformer

This federal procurement document outlines the salient characteristics for a custom-built, marine-grade, three-phase step-down transformer required by the Naval Postgraduate School (NPS) Physics Department. The transformer will support a Naval Conex box used for physics research aboard civilian research vessels, converting 440–480 VAC input power to 115 VAC multi-phase outputs. Key electrical and mechanical specifications include a power rating of 27 kVA or higher, approximately 3% impedance, copper winding, EMI shielding, and mandatory compliance with MIL-T-15108C. The unit must feature a marine-grade NEMA 4 enclosure, specific thermal ratings (50°C ambient / 115°C rise), and an open-delta grounding configuration compatible with shipboard systems. For mobility and securement on deck, the transformer must include removable locking casters, lifting eyes, and a reinforced underside for crane or forklift transport. Delivery is required at the NPS Warehouse in Monterey, California, within eight months of the contract award. To be deemed technically acceptable, quoters must submit comprehensive technical documentation—including manufacturer specifications, wiring and grounding details, mechanical dimensions, and explicit proof of MIL-T-15108C compliance.

This federal solicitation (N0024426Q0094), issued by the NAVSUP Fleet Logistics Center San Diego, seeks proposals for a custom-built, marine-grade, 3-phase step-down isolation transformer. The acquisition is set aside for Women-Owned Small Businesses (WOSB) under NAICS code 335311, with bids due by September 8, 2026. The transformer is required by the Naval Postgraduate School (NPS) to support naval acoustics research conducted onboard civilian research vessels. While Navy ships typically provide 115 VAC 3-phase power, civilian research vessels supply 480 VAC (or 440 VAC) 3-phase power. The requested 27 kVA (or higher) transformer will bridge this gap, stepping down 480 VAC ship power to supply three 115 VAC input lines for a physics research Conex box. Key technical requirements include a NEMA 4 marine-grade enclosure, EMI shielding, compliance with MIL-T-15108C specifications, and custom input/output configurations utilizing specific military-standard bulkhead connectors and fused lines. Mechanically, the unit must feature removable locking casters, lifting eyes, and a reinforced underside compatible with the standard UNOLS 2'x2' deck bolt pattern for secure shipboard transit and mounting. Delivery of this firm-fixed-price item is required at the Naval Postgraduate School in Monterey, California, by May 31, 2027. Invoicing must be processed electronically through the Wide Area WorkFlow (WAWF) system.