Our NETA-accredited organization provides insulating fluid analysis for in-service equipment without requiring shutdown or disassembly. Online sampling keeps disruption low while delivering current condition data, helping you plan your maintenance based on measured results instead of guesswork.

Transformer Oil Sampling Services

Our transformer oil sampling service captures condition data from the fluid while the unit remains energized. Transformer fluid is estimated to contain approximately 70% of the diagnostic data available for the unit, and our team reviews each sample against accepted industry limits and operations to deliver actionable insight into in-service performance. The results help evaluate the condition of the liquid and solid insulation systems, supporting maintenance scheduling and asset management.

Spot Early Warning Signs

Early signs of condition changes can point to larger equipment problems if left unaddressed. Abnormal thermal and electrical stress breaks down insulating oil and cellulosic insulation, producing fault gases that signal internal deterioration.

Changes in fluid color, viscosity, odors and oil leaks may indicate that the unit requires closer evaluation. Routine testing helps identify developing issues before they escalate into more serious equipment concerns.

Problems We Detect

Performing a dielectric fluid analysis allows us to track changes linked to internal stress, insulation aging and fluid deterioration. We identify the following conditions that affect the transformer performance, including:

• Thermal degradation

• Arcing

• Partial discharge

• Degradation of paper insulation

• Contamination and chemical breakdown

• Corrosive sulfur

Transformer Oil Analysis and Standard Testing

Our standard package includes tests used to assess fluid quality, insulation condition and electrical performance. Transformer oil analysis may include:

• Dissolved Gas Analysis (DGA), ASTM Standard D-3612

• Visual Examination, ASTM Standard D-1524

• Color Number, ASTM Standard D-1500

• Moisture Content, ASTM Standard D-1533B

• Interfacial Tension, ASTM Standard D-971

• Acid Number, ASTM Standard D-974

• Dielectric Strength, ASTM Standard D-1816 (1mm gap)

• Power Factor, ASTM Standard D-924

Additional Insulation Fluid Testing

Further testing is available when fluid-filled equipment requires a more detailed review. We conduct the following tests when we need to identify paper insulation damage, internal wear and fluid cleanliness:

• Furanic Compounds, ASTM Standard D-5837

• PCB Testing, GC-MS/MS method

• Metals, ASTM Standard D-5185

• Particle Count, Laser Technique

Dielectric Fluid Analysis and Condition Monitoring

We perform annual dissolved gas analysis and compare year-over-year results to build a more reliable view of transformer condition. By reviewing historical data alongside the current test results, we can determine whether the transformer's condition remains stable or has begun to deteriorate.

Our team identifies oxidation, sludge, moisture and contamination early, allowing corrective action before oil reclamation becomes more difficult and the transformer's life is shortened. We review multiple test results together to enable a more complete condition evaluation that guides maintenance decisions.

Computerized Analysis and Reporting

We process transformer oil sampling data through our Delta X Research Transformer Oil Analyst™ Software (TOA4) for computerized analysis. Each assessment includes a written report with findings, recommendations and corrective actions to support informed maintenance decisions.