Transformer Assembly Oversight Technician
Responsibilities
Oversee field assembly of power transformers, ensuring adherence to OEM manuals, drawings, torque charts, and work instructions.
Verify critical steps: tank inspection, core/coil handling, tapchanger installation and alignment, bushing assembly, gasket prep and sealing, conservator/radiators/fans/pumps installation, oil processing/vacuum dryout, and final checks.
Witness and document hold points, inspections, and tests per ITP/QCP (Inspection & Test Plan / Quality Control Plan).
Review and validate manufacturer’s specifications, drawings (GA, wiring diagrams, schematics), and field change notices before execution.
Maintain daily reports, photo records, punch lists, nonconformance reports (NCRs), and corrective actions.
Confirm torque values, clearances, and alignment meet specification; verify material certificates, serial numbers, and BOM traceability.
Ensure proper cleanliness, moisture control, and contamination prevention practices throughout assembly.
Witness field tests (as required): insulation resistance, turns ratio (TTR), winding resistance, power factor/DDF, excitation current, SFRA, CT polarity and ratio, and functional checks of OLTC controls/auxiliaries.
Confirm test instruments are within calibration and results meet acceptance criteria; escalate deviations promptly.
Technical Qualifications
Transformer components (core/coil, windings, OLTC/DETC, bushings, conservator, radiators, cooling systems, gauges/relays, CTs/PTs), assembly sequencing, cleanliness and moisture control.
Oil handling (vacuum fill, degasification, dehydration), leak prevention, gasket selection/prep, torque practices.
Field test witnessing and acceptance criteria familiarity (IR, TTR, winding resistance, PF/DDF, SFRA).
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