A Noninvasive Interturn Insulation Condition Monitoring Method Based on the Common-Mode Impedance Spectrum of Inverter-Fed Machines

Zheng, Dayong; Lu, Geye; Zhang, Pinjia

doi:10.1109/tia.2021.3094176

Cited by 14 publications

(7 citation statements)

References 30 publications

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“…Broadband voltage probes [58], [59], [60], [61] Broadband HSCT [7], [58], [59], [61] Broadband HSCT [57], [60], [62], [63] I lk [48] monitoring is presented in [54]. In this work the authors study the effect of thermal and electrical insulation degradation on the parasitic inter-turn capacitance in twisted pair specimens.…”

Section: One Of the Earliest Trends Of Inter-turn Insulation Degradationmentioning

confidence: 99%

“…These ca-pacitances are tracked around the switching frequency value, which do not reach the CM impedance resonant frequency when inductance affects the impedance value. The main contribution of [59] lays on the inter-turn insulation monitoring by tracking the variation of high-frequency CM impedance above the resonant frequency. This work is extended in [60], where the location of the insulation degradation is studied.…”

Section: One Of the Earliest Trends Of Inter-turn Insulation Degradationmentioning

confidence: 99%

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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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Section: One Of the Earliest Trends Of Inter-turn Insulation Degradationmentioning

confidence: 99%

Section: One Of the Earliest Trends Of Inter-turn Insulation Degradationmentioning

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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“…However, this model does not fit the experimental results well. Another model has been proposed in [84] with improved accuracy, but it still needs further research to fully distinguish the groundwall and interturn insulation ageing. The transmission line model considers the stator winding as a uniform transmission line [85], but being the interturn that ages a non-uniform process, it is hard to represent it properly.…”

Section: Selection Of the Hf Motor Modelmentioning

confidence: 99%

Impact of PWM Voltage Waveforms in High-Speed Drives: A Survey on High-Frequency Motor Models and Partial Discharge Phenomenon

et al. 2022

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The insulation system’s dielectric of the electric motor is very often subjected to severe electrical stress generated by the high dv/dt seen at the machine’s terminals. The electrical stress and high reflected wave transient overvoltage are even more evident in case of high-speed machines fed by high-frequency (HF) converters featuring very fast wide-bandgap devices. They are promoting the occurrence of partial discharges and consequently accelerate ageing. As this is serious issue and the main cause of the drive failure, it is important to analyse and characterise the surges at the motor terminals. Several HF models of motors have been proposed in the literature for this purpose. This article presents a survey on HF motor models, which is crucial in understanding and studying the most critical parameter identification and overvoltage mitigation techniques. Moreover, it offers a comparison of the models’ main features as well as a comparison with the experimental voltage waveform at motor terminals. A general overview of the partial discharge (PD) phenomenon is also provided, as it is favoured by HF operation and together with HF motor modelling provides key insights to the insulation ageing issue. In particular, an analysis of the effects of PWM waveform affecting insulation is given, as well as useful methods for developing strategies for the inspection and maintenance of winding insulation.

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“…Several machine models capable of capturing the machine's high-frequency behavior in detail have been proposed in the scientific literature [10]. These HF models can be mainly grouped into four families: lumpedparameter circuit models [11]- [14], multi-section models [15], [16], transmission-line models [17], and analytical models. Lumped-parameter circuits are made of passive branches interconnected to model the behavior of the entire machine phase winding.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Electrical Aging Effects on AC High Frequency Motor Based on Exchange Market Algorithm Model Parameter Identification

Bruno,

D’Amato,

Leuzzi

et al. 2024

IEEE Access

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The new wide-bandgap power semiconductor devices, such as gallium nitride and silicon carbide, have encouraged the development of power electronic converters with better efficiency, higher switching frequency, and smaller packages. However, such fast power converters are characterized by steep pulse width modulation voltage waveforms that cause increased electrical stress on the insulation system of the electric machine windings, eventually leading to premature failure. This poses a serious problem for high-speed applications where high system reliability and safety are required. Therefore, this work aims to show the effects of electrical aging on the high-frequency characteristics of electrical machines and then to assess the damage caused to the windings of a motor by such steep PWM waveforms. Finally, using a highfrequency model of the machine windings, it is possible to identify the parameters that are most affected by electrical stresses and thus assess the aging status of the insulation system.INDEX TERMS High-speed AC drives, high-frequency converters, insulation aging, partial discharges, pulse width modulation.

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A Noninvasive Interturn Insulation Condition Monitoring Method Based on the Common-Mode Impedance Spectrum of Inverter-Fed Machines

Cited by 14 publications

References 30 publications

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

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

Impact of PWM Voltage Waveforms in High-Speed Drives: A Survey on High-Frequency Motor Models and Partial Discharge Phenomenon

Analysis of Electrical Aging Effects on AC High Frequency Motor Based on Exchange Market Algorithm Model Parameter Identification

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