Three-Phase Distribution Pad-Mount Transformers

The City of Austin Electric Utility Department is seeking a Request for Information (RFI) for three-phase distribution pad-mount transformers rated between 75 and 2,500 kilovolt-amperes (kVA) at 15 kilovolt primary voltage. This procurement targets self-cooled, compartmental-type, dead-front transformers designed for underground distribution electrical facilities, with a preference for radial-feed and loop-feed configurations. Vendors must provide detailed technical specifications aligned with IEEE, ANSI, and NEMA standards, including comprehensive documentation on transformer characteristics such as core construction, insulation properties, tank design, and testing protocols. Specific requirements include sealed-tank construction with Type II mineral oil, grain-oriented silicon steel cores, and thermally upgraded kraft paper insulation. The RFI mandates that manufacturers have at least five years of experience manufacturing three-phase pad-mounted distribution transformers, with transformer weight not exceeding 16,000 pounds. Key submission requirements include identifying potential specification discrepancies, recommending improvements, confirming manufacturing feasibility, and providing estimated production lead times. The response deadline is January 28, 2026, with submissions to be sent to Gaurav Thakkar, Utility Commodity Manager, at gaurav.thakkar@austinenergy.com.

While the RFI does not explicitly outline set-aside designations or specific vendor restrictions, it emphasizes comprehensive technical compliance and manufacturing capabilities. The procurement process includes rigorous evaluation criteria, with potential financial penalties for transformers exceeding specified loss parameters: a $350 immediate fee plus calculated losses fees of $6.461 per watt for excess no-load losses and $3.379 per watt for excess load losses. Transformers must meet strict performance standards, including the ability to operate across temperatures from -5C to 105C and withstand internal pressures up to 12 pounds per square inch gauge (psig) without rupturing. The specification requires extensive testing, including no-load loss, load loss, excitation current, applied voltage, and lightning impulse testing, with manufacturers required to provide certified test reports. Although no specific budget range is mentioned, the detailed technical requirements suggest a significant investment in high-quality electrical infrastructure. The document indicates this RFI is preparatory to a future procurement process, focusing on gathering vendor input to refine technical specifications and ensure alignment with current manufacturing capabilities and industry best practices.