Topic:"Generator Interconnection" in M13125

Why do this project now? Unit 1 has been offline since 2020 due to mechanical and electrical component conditions. This investment has been deferred to reprioritize other higher priority, higher generation, units requiring overhauls that a...

AI summary Unit 1 has been offline since 2020 and requires refurbishment to support the Tusket Main Dam project and ensure operational reliability. NS Power plans to complete the overhaul during an outage to reduce costs, improve flexibility, and avoid future risks. The project is being done concurrently with Unit 1 generator refurbishment for efficiency.

Why do this project this way? Refurbishment of this unit through the replacement of identified worn components represents the lowest-cost approach for achieving the intended project scope, considering both the current condition of the comp...

AI summary The refurbishment of Tusket Hydro Unit 1 through component replacement represents the lowest-cost solution for achieving project goals, preserving reliability, and enhancing environmental performance. The overhaul includes replacing worn turbine and governor components, using modern materials to reduce environmental risks and maintenance needs, and restoring the unit to modern standards while maximizing asset life and operational performance.

DESCRIPTION: This project is for the refurbishment of Tusket Unit 1 generator rotor and stator. The scope includes a complete stator rewind, replacement of rotor pole insulation and associated rotor refurbishment, replacement of deteriorat...

AI summary This document describes a project to refurbish the generator rotor, stator, and exciter at Tusket Unit 1, located at the Tusket Hydro Station. The refurbishment includes rewinding the stator, replacing insulation and electrical components, and testing. The project aims to improve reliability, reduce electrical faults, and extend the unit's operating life. The station has been in service since 1929 with no major refurbishments since 1930.

Why do this project? A generator condition assessment was completed in 2019 (Attachment 1) which identified significant age-related deterioration throughout the stator, rotor, and excitation systems.

AI summary A generator condition assessment completed in 2019 identified significant age-related deterioration in the stator, rotor, and excitation systems.

Why do this project now? NS Power intends to complete construction of the Main Dam with the Lake Vaughan Reservoir remaining within its regulated operating range. This will require the support of the generating units and it is critical to...

AI summary NS Power plans to complete the Main Dam construction and the Unit 1 turbine overhaul concurrently to ensure operational stability, reduce risks, and minimize lifecycle costs. This approach avoids future disruptions, improves maintenance flexibility, and enhances the reliability of the Tusket Powerhouse.

Why do this project this way? Refurbishing the stator, rotor, and exciter as a single electrical project addresses the primary age-related risks associated with Unit 1's original 1929 generator components. Completing all major generator wo...

AI summary Refurbishing Unit 1's generator components as a single project improves reliability and reduces future outages. Reusing existing rotor poles and refurbishing them off-site is more economical. Combining this with turbine rehabilitation maximizes lifecycle value and extends asset life.

ROTOR FIELD WINDING TESTING Customer: Nova Scotia Power Volts: 6600 Site: Tusket Rating: 900 KVA Unit Number: 1 Lead Type: Cable Job Number 0 Insulation: 0 Customer Ref.: 0 Coil Type: Edge Wound Number Poles: 32 Quantity 32 Work Scope: Tes...

AI summary The document outlines rotor field winding testing conducted at the Tusket site for Nova Scotia Power. The polarization index (P.I.) result was 0.00, which is below the acceptance criteria of 1.5. The test was performed by Darrel Cormier on June 18, 2019, with the leads disconnected.