Oil Testing & Analysis
We Do Transformer Oil Testing and Analysis
Whether your transformers use mineral oil or natural esters, we test across all dielectric insulating liquids and turn results into actions your team can take with confidence—supporting power system owners across the U.S. and in more than 20 countries.
The right plan starts with the right data.
You keep the power on—we help you do it with confidence. With SDMyers at your side, transformer oil testing becomes a clear and reliable way to identify risks early and protect asset life across your fleet. Drawing on six decades of experience and millions of test results each year, our specialized, high-capacity lab delivers fast, repeatable insights for organizations managing multi-site operations.
Whether your transformers use mineral oil or natural esters, we test across all dielectric insulating liquids and turn results into actions your team can take with confidence—supporting power system owners across the U.S. and in more than 20 countries.
5 Reasons to Perform Regular Testing:
Prolong the life of your transformer fleet.
Catch issues and critical actions required.
Prevent outages and eliminate surprises.
Create a plan for repair or replacement.
Gain productivity insight, improve operations
8 Reasons to Perform Regular Testing:
Prolong the life of your transformer fleet.
Catch issues and critical actions required.
Prevent outages and eliminate surprises.
Create a plan for repair or replacement.
Prolong the life of your transformer fleet.
Catch issues and critical actions required.
Prevent outages and eliminate surprises.
Create a plan for repair or replacement.
7 Reasons to Perform Regular Testing:
Prolong the life of your transformer fleet.
Catch issues and critical actions required.
Prevent outages and eliminate surprises.
Create a plan for repair or replacement.
Prolong the life of your transformer fleet.
Catch issues and critical actions required.
Prevent outages and eliminate surprises.
6 Reasons to Perform Regular Testing:
Prolong the life of your transformer fleet.
Catch issues and critical actions required.
Prevent outages and eliminate surprises.
Prolong the life of your transformer fleet.
Catch issues and critical actions required.
Prevent outages and eliminate surprises.
Featured Video
Why Test with SDMyers?
Test packages that target every condition for every type of transformer.
Purpose-built test packages pinpoint issues early—so you can plan maintenance, prevent failures, and keep operations online.
Clear understanding of test results with expert recommendations.
Clear reports connect lab data to likely failure modes, with evidence-based recommendations you can trust. Behind every recommendation are millions of real-world data points and six decades of pattern recognition, giving your team confidence to act decisively.
Qualified and trained field technicians with nationwide coverage.
Consistent sampling equals trustworthy data and better decision-making. Our Field Inspection Technicians (FITs) communicate clearly, and document everything—because integrity and care aren’t just values; they’re how we operate in the field.
Testing for both mineral-oil-filled and alternative-liquid-filled transformers
One partner for mineral oil, natural/synthetic esters, and silicone—so your mixed fleet gets consistent, accurate care, with maintenance actions that protect asset life.
The world’s largest dielectric liquid testing lab for transformers.
Unmatched scale and specialization mean faster turnaround, deeper insights, and proven reliability at enterprise scale. Your results are backed by one of the industry’s largest transformer fluid analysis databases, enabling stronger benchmarking and smarter calls when the stakes are high.
Meet industry standards for electrical equipment maintenance.
Our testing results and recommendations align with major industry standards (ASTM, IEEE, NFPA 70B, ISO, ANSI, and more), delivering repeatable and credible results to help you make confident decisions when planning maintenance, repairs, or capital spend.
Certifications & Partnerships
Powered by industry-respected accreditations, certifications, and partnerships to deliver accurate testing, sound diagnostics, and safe fieldwork.
Free Download for Transformer Owners
Quick Guide to Transformer Oil Testing: Understanding Your Results
Annual dielectric liquid testing and diagnostic analysis of the transformer insulating oil will help transformer owners keep their fleet functional and extend asset life. Testing produces a lot of data, however, and it can be challenging to understand what all that information means. This guide walks you through all the tests for your power transformer, including testing for fault gases, dielectric breakdown voltage, Karl Fischer testing, liquid power factor, partial discharge, and other relevant tests.
Download our handy reference to help you grasp the fundamentals of transformer oil testing and how your results can impact the reliability of your transformer. We'll also send you a few extra tips on how to maintain reliability beyond oil testing.
Download the Free Understanding Transformer Testing Guide
Download - Oil Testing Guide
How DGA Testing and IR Scanning Saved the Day
IR scanning aided the Dissolved Gas Analysis for a Pennsylvania-based company, identifying a potential transformer deficiency and supporting strategic reliability planning. By cross-referencing the IR scans with the DGA results, SDMyers was able to look for elevated levels of ethylene, among other dissolved gases, to confirm an internal issue.
How DGA Testing and IR Scanning Saved the Day
IR scanning aided the Dissolved Gas Analysis for a Pennsylvania-based company, identifying a potential transformer deficiency and supporting strategic reliability planning. By cross-referencing the IR scans with the DGA results, SDMyers was able to look for elevated levels of ethylene, among other dissolved gases, to confirm an internal issue.
How DGA Testing and IR Scanning Saved the Day
IR scanning aided the Dissolved Gas Analysis for a Pennsylvania-based company, identifying a potential transformer deficiency and supporting strategic reliability planning. By cross-referencing the IR scans with the DGA results, SDMyers was able to look for elevated levels of ethylene, among other dissolved gases, to confirm an internal issue.
Resources
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Frequently Asked Questions
SDMyers recommends annual testing of dielectric liquid samples to provide critical data that pinpoints issues, diagnoses potential problems, and prevents failures from occurring. The standardization of NFPA 70B in 2023 means annual liquid sampling and testing is now a minimum requirement for transformer maintenance. However, depending on the criticality of your high-voltage equipment, more frequent or additional testing may be needed. Consult an SDMyers transformer specialist to determine the best solution for your organization.
SDMyers recommends annual testing of dielectric liquid samples to provide critical data that pinpoints issues, diagnoses potential problems, and prevents failures from occurring. The standardization of NFPA 70B in 2023 means annual liquid sampling and testing is now a minimum requirement for transformer maintenance. However, depending on the criticality of your high-voltage equipment, more frequent or additional testing may be needed. Consult an SDMyers transformer specialist to determine the best solution for your organization.
SDMyers recommends annual testing of dielectric liquid samples to provide critical data that pinpoints issues, diagnoses potential problems, and prevents failures from occurring. The standardization of NFPA 70B in 2023 means annual liquid sampling and testing is now a minimum requirement for transformer maintenance. However, depending on the criticality of your high-voltage equipment, more frequent or additional testing may be needed. Consult an SDMyers transformer specialist to determine the best solution for your organization.
SDMyers recommends annual testing of dielectric liquid samples to provide critical data that pinpoints issues, diagnoses potential problems, and prevents failures from occurring. The standardization of NFPA 70B in 2023 means annual liquid sampling and testing is now a minimum requirement for transformer maintenance. However, depending on the criticality of your high-voltage equipment, more frequent or additional testing may be needed. Consult an SDMyers transformer specialist to determine the best solution for your organization.
SDMyers recommends annual testing of dielectric liquid samples to provide critical data that pinpoints issues, diagnoses potential problems, and prevents failures from occurring. The standardization of NFPA 70B in 2023 means annual liquid sampling and testing is now a minimum requirement for transformer maintenance. However, depending on the criticality of your high-voltage equipment, more frequent or additional testing may be needed. Consult an SDMyers transformer specialist to determine the best solution for your organization.
SDMyers recommends annual testing of dielectric liquid samples to provide critical data that pinpoints issues, diagnoses potential problems, and prevents failures from occurring. The standardization of NFPA 70B in 2023 means annual liquid sampling and testing is now a minimum requirement for transformer maintenance. However, depending on the criticality of your high-voltage equipment, more frequent or additional testing may be needed. Consult an SDMyers transformer specialist to determine the best solution for your organization.
SDMyers recommends annual testing of dielectric liquid samples to provide critical data that pinpoints issues, diagnoses potential problems, and prevents failures from occurring. The standardization of NFPA 70B in 2023 means annual liquid sampling and testing is now a minimum requirement for transformer maintenance. However, depending on the criticality of your high-voltage equipment, more frequent or additional testing may be needed. Consult an SDMyers transformer specialist to determine the best solution for your organization.
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Reliable Dielectric Liquid Testing for Your Transformers
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