Summary: Little Goose 500 KV Spare GSU Transformer Requirements Summary Sheet

This document is a detailed Requirements Summary Sheet for a 500 KV spare Ground Service Unit (GSU) transformer for the Little Goose facility, referenced to Specification Section 48 19 23 08 26. The transformer specifications include a 500 MVA capacity, 500/230/13.8 KV voltage levels, single-phase configuration with impedance of 17.75%, and maximum winding temperature rise of 65°C. The transformer must accommodate a hydrogen blanket pressured system at 2 psig with oil preservation capability. Key construction requirements specify weatherproof steel tanks, durable enamel paint, ASTM M27 oil with preservation features, and dual tank nitrogen regulator cabinets with control power supplied at 120 VAC. The unit must include separate control and power cabinets with weather-proof design, high-voltage bushings with 230 KV and 13.8 KV ratings, and specialized internal cooling components including thermowells, radiators, and fan control systems.

The document provides comprehensive bills of materials across multiple transformer segments (Segments 1-4) and includes detailed factory assembly requirements, acceptance testing protocols, and spare parts specifications. Factory Acceptance Tests (FAT) must include routine tests per IEEE Std 57.12.90, temperature tests, and specialized procedures for high-voltage bushing testing, leakage reactance, frequency response analysis, and dissolved gas analysis. All components must be completely assembled and tested at the factory with comprehensive documentation. Detailed engineering drawings are included showing transformer cover configurations, low-voltage bushing holsings, core and core frame grounding details, and tank segment identifications for proper assembly and installation.