Attachment-4 OA_FP GSU Transformer Contract Drawings 2 of 3 (1).pdf

This file contains detailed engineering design drawings and technical specifications for generator step-up (GSU) transformers for the Oahe Dam in South Dakota and Fort Peck Dam in Montana. The drawings provide comprehensive technical details including transformer configurations, electrical schematics, control cabinet layouts, wiring diagrams, temperature monitoring systems, and transformer pad and mounting specifications. The documents cover 11 total transformers: one 103,000 kVA three-phase transformer and nine 68,667 kVA single-phase transformers for Oahe Dam, and two 42,000/56,000 kVA three-phase transformers for Fort Peck Dam. Technical specifications include voltage ratings from 115 kV to 230 kV, detailed factory assembly requirements, acceptance testing protocols, and comprehensive documentation for transformer shipment, handling, and site assembly. The drawings also include environmental and operational specifications such as temperature ranges, cooling systems, and installation guidelines for the transformers at each dam's powerhouse location.