Vibro Acoustic as a Fast Diagnostic Tool for On Load Tap Changers

Vibro Acoustic as a Fast Diagnostic Tool for On Load Tap Changers - June 25, 2025
Name of Presenter: Dr. Fouad Brikci is President of Zensol Automation, Inc.

Understanding Vibro Acoustic as a Fast Diagnostic Tool for On Load Tap Changers

The functioning of an On-Load Tap Changer (OLTC) is complex, since a lot of mechanisms are operating at the same time. Classic testing techniques give very little information on mechanical problems occurring inside an OLTC while in service. This presentation shows how the vibroacoustic method is used as a fast diagnosis tool to easily detect mechanical problems in Tap Changers ON-LINE or OFF-LINE, before they create an outage. We will show also how simultaneous correlation of signals recorded by Vibroacoustic, Motor Current and Dynamic Resistance Measurement (DRM) allows a fast understanding of the internal movements of an OLTC. Each of these tests provides a piece of information that creates a complete picture of the OLTC's condition. Finally, we will present a real case showing how the electric utility New Brunswick Power uses this tool to properly adjust an OLTC.

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