Power transformer maintenance is facing its most significant update in years.

Since On-Load Tap Changers (OLTCs) historically account for over 40% of transformer failures, international regulations are increasingly focusing on their diagnosis.

Is your team fully equipped to meet these new requirements?

We are proud to announce that our long-standing engineering methodologies serve as a benchmark for the new IEEE guidelines.

Furthermore, our testing solutions are fully compliant and ready for the tap changer testing guide, IEEE C57.152.

What does the new IEEE guide require?

The updated framework focuses heavily on capturing defects before they cause critical grid failures. The main updates include:

• Dynamic Resistance Measurement (DRM): You can no longer rely solely on static measurements. The new guide emphasizes tracking contact transitions in milliseconds.
• High-Resolution Graphing: Accurate evaluation requires capturing the transition process with a high recording resolution of 0.1 ms (10 kHz sampling rate) to detect the smallest micro-discontinuities.

By combining deep industry expertise with DV Power’s cutting-edge diagnostic equipment (RMO-T and TWA series) and DV-TR software, we have developed a seamless workflow that makes compliance effortless.

With this advanced setup, you gain access to:

• Advanced DRM Analytics: Instantly detect contact wear, synchronization issues, and transition resistor degradation.
• Automated Multi-Tap Testing: Test all phases and multiple tap changer positions quickly, saving hours of field time while generating fully compliant digital reports.

There is no need to feel overwhelmed by these new technical requirements.

The DV Power team is fully prepared to provide comprehensive training and support, guiding your team step-by-step on how to accurately analyze testing results and master the new methodologies.

Following the new guide is crucial for preventing unexpected failures and maintaining stable transformer performance.

July 3, 2026