Project Overview
A primary distribution transformer in service had failed and caused a loss of power to a critical area of the facility. Our team was brought in to safely de-energize, remove, and replace the damaged unit with a new transformer, then reconnect, terminate, test, and restore service with minimal downtime.
The job involved high-energy equipment, tight clearances, and coordination with site operations to keep people safe while getting the system back online quickly and to code.
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Scope of Work
- Lockout / Tagout & De-Energization: Isolated the affected feeder and verified zero energy before any work began.
- Removal of Failed Transformer: Disconnected primary and secondary conductors, lifted out the damaged unit, and prepared it for disposal per environmental rules.
- New Transformer Install: Set and secured the new transformer in position, aligned to mounting and clearance requirements.
- Cable Termination: Re-landed primary and secondary conductors, torqued connections to spec, verified phasing and tap settings.
- Bonding & Grounding: Confirmed bonding jumpers, grounding electrode connections, and enclosure continuity to OESC/ESA requirements.
- Testing: Performed insulation resistance (megger), torque log, voltage check, and load balance check prior to energizing.
- Re-Energization & Verification: Brought the transformer online under supervision, confirmed stable output and absence of abnormal sound/heat.
- Documentation: Updated single-line, panel schedules, and turnover notes for the owner's records and inspection.
Outcomes
- Power restored safely with a new, code-compliant transformer.
- Documented connections and test results for traceability and ESA inspection.
- Reduced downtime for the facility and stable service to downstream equipment.