Validity of frequency response analysis (FRA) for diagnosing large salient poles of synchronouos machines

Mugarra, Asier; Platero, Carlos A.; Martínez, J. Á.; Albizuri-Txurruka, Unai

doi:10.1109/tia.2019.2949982

Cited by 20 publications

(1 citation statement)

References 23 publications

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“…A more recent research trend consists of the offline SFRA diagnosis of salient pole windings for MVA-range synchronous generators. Thus, inter-turn and ground faults in large salient poles are studied in [38] and [39] respectively. In addition, [40] and [41] deal with the automatic detection and assessment of such faults in large salient poles.…”

Section: Fra Applied To Rotating Machinesmentioning

confidence: 99%

A Review of Broadband Frequency Techniques for Insulation Monitoring and Diagnosis in Rotating Electrical Machines

Ruiz-Sarrio,

Antonino-Daviu,

Navarro-Navarro

et al. 2024

IEEE Trans. on Ind. Applicat.

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Rotating electrical machines greatly suffer from insulation degradation and failure. The adoption of wide bandgap semiconductors in Variable-Frequency Drives (VFDs) hinder the utilization of traditional techniques such as on-line Partial Discharges (PD) to monitor and diagnose the insulation status and failure. Alternative techniques exploiting the broadband frequency behaviour of machine windings, and the increased high-frequency content of VFD excitation arise as a valid alternative. The present work provides a comprehensive analysis and review of cutting-edge broadband frequency techniques aimed to diagnose winding insulation degradation and faults. First, the broadband nature of machine windings is illustrated by explaining the per-turn equivalent circuit and the physical interpretation of its parameters. Then, the different insulation monitoring and diagnosis methods are thoroughly reviewed. The analysed methods include the Frequency Response Analysis (FRA) applied to rotating electrical machines, the analysis of Common Mode (CM) broadband impedance and parasitic capacitances, and methodologies based on the analysis of transient high-frequency current ringing. Specific focus is placed on the instrumentation, which often represents the main applicability limitations.

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