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Updated: Jul 24, 2025

A Guide to Concentration Alternating Frequency Response Analysis of Fuel Cells
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Detection of Failures in Metal Oxide Surge Arresters Using Frequency Response Analysis
Tiago Goncalves Zacarias1,2, Rafael Martins3, Carlos Eduardo Xavier3
1R&D Department, Gnarus Institute, Itajuba 37500-052, MG, Brazil.
Abstract:
This work presents an innovative application of Frequency Response Analysis (FRA) in order to detect early degradation of Metal Oxide Surge Arresters (MOSAs). This technique has been widely used in power transformers, but has never been applied to MOSAs. It consists in comparisons of spectra, measured at different instants of the lifetime of the arrester. Differences between these spectra are an indicator that some electrical properties of the arrester have changed. An incremental deterioration test has been performed on arrester samples (with controlled circulation of leakage current, which increases the energy dissipation over the device), and the FRA spectra correctly identified the progression of damage. Although preliminary, the FRA results seemed promising, and it is expected that this technology could be used as another diagnostic tool for arresters.
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