Description
Repair, maintain, and install power and distribution transformers and related components, including windings, bushings, tap changers, cooling systems, and control wiring.
- • Measure turns ratio, polarity, and phase displacement with TTR meters to diagnose winding and connection faults.
- • Measure insulation resistance and polarization index with megohmmeters to assess dielectric condition.
- • Measure winding resistance and excitation current to identify shorted turns, loose connections, or tap issues.
- • Perform power factor and capacitance tests on windings and bushings using Doble or equivalent equipment.
- • Record required repairs, parts used, test results, and labor time.
- • Disassemble transformers, bushings, radiators, and tap changers for inspection and repair using hand and power tools.
- • Reassemble and seal transformers to specified ratings and torque values using appropriate tools and test equipment.
- • Maintain stocks of gaskets, bushings, oils, tap changer parts, and hardware.
- • Repair or replace defective windings, leads, bushings, gaskets, fans, pumps, gauges, and wiring.
- • Rewire control cabinets and replace sensors, relays, meters, and indicators.
- • Inspect electrical connections, leads, LTC mechanisms, cooling systems, and control wiring using diagrams and manuals.
- • Read service guides, nameplates, work orders, and schematics to determine repair steps and test parameters.
- • Solder, braze, or weld lead connections and terminal lugs to ensure reliable joints.
- • Assemble components such as bushings, radiators, conservators, gauges, and tap changers per drawings.
- • Lubricate LTC mechanisms, motor drives, and fan and pump bearings.
- • Remove and replace worn parts such as gaskets, lead wires, LTC contacts, and tap resistors using soldering and brazing tools.
- • Lift cores, tanks, and assemblies with cranes or chain hoists, or signal crane operators.
- • Weld or braze tank leaks and attachment points, then pressure test repairs.
- • Rewind or replace coils and reinsulate windings using coil-winding machines and drying ovens.
- • Cut, form, and install insulating paper, pressboard, and barriers for windings and core assemblies.
- • Configure and run automated test sets and monitors via computer to verify performance.
- • Verify clearances, clamping pressure, and dimensions of cores and windings using gauges and torque tools.
- • Check for overheating and hotspots with infrared scanners and thermometers during tests.
- • Clean and flush tanks, radiators, and components to remove sludge, moisture, and contaminants.
- • Degas, filter, and vacuum-fill insulating oil; sample and test oil for moisture, dielectric strength, acidity, and dissolved gases.
- • Perform vacuum and pressure leak tests on tanks, bushings, and fittings.
- • Service and adjust on-load tap changers, including inspection of contacts, selectors, diverter switches, and drive mechanisms.
- • Install and test auxiliary devices such as pressure relief valves, Buchholz relays, breathers, gauges, fans, and pumps.
- • Ground, isolate, and lock out equipment; test for absence of voltage before starting work.
- • Prepare detailed test reports, as-found/as-left data, and customer documentation.
- • Prime, paint, and coat tanks and radiators to prevent corrosion.
- • Straighten and repair dented or twisted tank panels and enclosures.
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This site includes information from O*NET by the U.S. Department of Labor, Employment and Training Administration (USDOL/ETA), used under the CC BY 4.0 license. Career Clutch has modified some of this information for student readability. USDOL/ETA has not approved, endorsed, or tested these modifications. O*NET® is a trademark of USDOL/ETA.
Last reviewed: Jan 2026
