Power_Transformer_Maintenance_Checklist_Unit_1.pdf

This Power Transformer Maintenance Checklist is a technical document prepared by GRU (Gainesville Regional Utilities) in Florida for the Life Extension for Deerhaven Unit 1 Transformers project. The checklist establishes the comprehensive maintenance and testing requirements for power transformers as part of GRU's initiative to extend the operational life of Unit 1 transformers at the Deerhaven facility for an additional five years. The scope of work encompasses three transformers (T-61, T-62, and T-65), with T-61 and T-62 requiring procurement and replacement of radiators, wiring between transformer cabinets, transformer components, and full testing, while T-65 is limited to testing only. The checklist outlines specific inspection tasks including physical condition assessment, control cabinet inspection, liquid level verification in tanks and bushings, equipment cleaning, temperature monitoring at ambient, winding, and top oil levels, and calibration of temperature gauges with replacement thresholds established at 20 degrees variance.

The maintenance checklist details comprehensive testing protocols that contractors must complete, including power factor (PF) winding testing, winding resistance testing, PF bushing testing, transformer turns ratio (TTR) testing, and excitation testing. Additional requirements include verification of operational safety systems such as pressure relief devices, liquid level alarms, sudden pressure relays coordinated with GRU relay technicians, loss of AC alarms, and pressurized inert gas system inspection. Contractors must verify fan operation and complete a Testing MxOrder inspection sheet, with final closeout responsibility assigned to GRU. The checklist includes designated areas for documenting personnel involved, providing wraup comments, and recording the completion date, ensuring comprehensive documentation and accountability throughout the maintenance and testing process.