Oil-Filled Transformer Repair & Onsite Maintenance Services

Oil-filled transformers are critical to power distribution, industrial operations, municipal systems, and renewable energy installations. As solar farms and wind generation sites continue to grow, the number of installed oil-filled transformers has increased dramatically—making proper maintenance essential for reliability and safety.
 

These units depend on high-quality insulating oil to provide cooling, dielectric protection, arc suppression, and moisture control. When transformer oil or internal components degrade, the risk of failure, downtime, and costly unplanned outages rises quickly.

A&W Electric specializes in comprehensive oil-filled transformer repair, onsite transformer services, and preventative maintenance designed to extend equipment life and maximize system reliability.

Comprehensive Onsite Oil-Filled Transformer Services

Our certified transformer technicians deliver a full range of onsite diagnostics, repair, testing, and maintenance solutions for medium- and high-voltage transformers. A&W Electric provides:

Cooling System Repairs

• Replacement of transformer pumps, coolers, fans, and radiator assemblies

• Restoration of proper heat dissipation to prevent overheating and insulation failure

Leak Repair & Oil Restoration

• Transformer leak detection and repair

• Oil top-off, filtering, degassing, and full oil replacement

• Improves dielectric strength and removes moisture and contaminants

Bushing Services

• Cleaning, inspection, or replacement of transformer bushings

• Helps prevent flashovers and surface tracking issues

Gauges & Monitoring Device Replacement

• Level gauges, temperature sensors, pressure relief devices, and sudden pressure relays

• Ensures accurate monitoring of transformer health conditions

Infrared (IR) Thermography

• Hot-spot detection

• Loose connections, overload conditions, and failing cooling equipment

• Ideal for early detection of electrical and mechanical issues

Ultrasonic Testing

• Identifies internal arcing, partial discharge, corona, and insulation tracking

• A leading method for failure prevention

Electrical Diagnostic Testing

• Insulation resistance testing

• Winding resistance

• Current imbalance

• Turns ratio (TTR) testing

• Power factor/dissipation factor testing (optional)

• Detects winding degradation, shorted turns, and insulation breakdown

Load Tap Changer (LTC) Servicing

• Internal cleaning, inspection, lubrication, and oil filtration

• Improves voltage regulation and prevents LTC failures

Oil Testing, Filling & Replacement

• Dissolved Gas Analysis (DGA)

• Dielectric breakdown voltage

• Moisture content

• Acid number, interfacial tension, and PCB testing

• Provides a data-driven assessment of transformer condition

Annual Transformer Maintenance Programs

• Preventative and predictive maintenance

• Yearly field testing

• Detailed transformer health reports

• Reduces risk of unplanned outages and extends equipment life

Why Regular Oil-Filled Transformer Maintenance Matters

Routine testing and maintenance offer major benefits:

• Extended transformer lifespan through clean, dry, stable insulating oil

• Improved system reliability with early detection of overheating, arcing, and mechanical wear

• Lower operating costs by preventing catastrophic failures

• Safer operation by reducing arc-flash and fire risks

• Better power quality for industrial and municipal facilities

A&W Electric: A Leader in Oil-Filled Transformer Repair

With decades of experience in transformer repair, field services, and industrial electrical support, A&W Electric delivers fast, reliable, and cost-effective solutions for:

• Industrial plants

• Municipal utilities

• Renewable energy sites (solar, wind)

• Commercial facilities

• Distribution substations

Whether you need onsite oil-filled transformer repairs, emergency support, or a proactive maintenance plan, A&W Electric provides the expertise and capabilities to keep your electrical system running safely and efficiently.