Transformer oil and insulating oil tests, from our Total Quality Experts.

Intertek Caleb Brett

Intertek's TransoilCHECK© program provides transformer oil and insulating oil analysis and testing on a global basis. The laboratories test for transformer oil purity, quality, and chemical composition. Transformer oil test methods include ASTM, BS,and other recognized transformer oil analysis testing procedures. Specific transformer oil test method availability will vary depending upon location. Please contact Intertek for more information.

Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry practice. General and physical tests are suggested twice a year, dissolved gas analysis once a year, and Furan testing every 2 years for transformers in operation at least 5 years. Samples are easily shipped to Intertek laboratories providing transformer oil analysis, on a global basis. Insulating oil and transformer oil testing labs are located in the United Kingdom, United Arab Emirates, Singapore, Africa, Mexico, Spain, and other locations. The labs test insulation oil samples from clients across the world.

Transformer oil testsTransformer oil test methods
Appearance at 15°CASTM D4176
Water ContentASTM D1533B, D6304
Density at 15°CASTM D4052
Specific GravityASTM D4052
Suspended Particles in OilVisual
Dielectric Breakdown Voltage ASTM D877
Sediment, SludgeBS 5730
Interfacial TensionASTM D971
Kinematic ViscosityASTM D445
ColorASTM D1500
Neutralisation Value mg KOH/gASTM D974
Flash PointASTM D92
Pour Point ° CASTM D97
Particle Count (NAS 1638,ISO 4406) Automatic Particle Counter
Dissolved Gas AnalysisASTM D3612
Trace Gases Analysis: 
Carbon Dioxide, Carbon Monoxide ppm 
Acetylene, Ethylene ppm  
Oxygen, Nitrogen ppm 
Methane, Ethane ppm 
Hydrogen ppm 
Total Dissolved Combustible Gases ppm 
Composition of insulating oils by petroleum originASTM D2140
Dissipation Factor at 100°CASTM D924
Contact Intertek