An Improved Online Stator Insulation Monitoring Method Based on Common-Mode Impedance Spectrum Considering the Effect of Aging Position

Zheng, Dayong; Lu, Geye; Zhang, Pinjia

doi:10.1109/tia.2022.3160131

Cited by 18 publications

(15 citation statements)

References 26 publications

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“…Stator insulation failure has been reported as the second most frequently occurring fault in induction machines [1][2][3]. The exposition of the machine windings to high rates of voltage change (dv/dt) due to switches commutation has been early reported to have adverse effects on the insulation [4], which are worsened with the use of new fast switching wide-bandgap devices [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Insulation Condition Assessment in Inverter-Fed Motors Using the High-Frequency Common Mode Current: A Case Study

Saeed,

Fernández,

Guerrero

et al. 2024

Energies

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The use of the common mode current for stator winding insulation condition assessment has been extensively studied. Two main approaches have been followed. The first models the electric behavior of ground-wall insulation as an equivalent RC circuit; these methods have been successfully applied to high-voltage high-power machines. The second uses the high frequency of the common mode current which results from the voltage pulses applied by the inverter. This approach has mainly been studied for the case of low-voltage, inverter-fed machines, and has not yet reached the level of maturity of the first. One fact noticed after a literature review is that in most cases, the faults being detected were induced by connecting external elements between winding and stator magnetic core. This paper presents a case study on the use of the high-frequency common mode current to monitor the stator insulation condition. Insulation degradation occurred progressively with the machine operating normally; no exogenous elements were added. Signal processing able to detect the degradation at early stages will be discussed.

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Section: Introductionmentioning

confidence: 99%

“…The use of the common mode current has been explored as a means to detect insulation degradation at early stages. While the method is well established for high-voltage, lineconnected machines [2,3,[20][21][22], its application to low-voltage, inverter-fed machines are less mature [7][8][9][10][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Insulation Condition Assessment in Inverter-Fed Motors Using the High-Frequency Common Mode Current: A Case Study

Saeed,

Fernández,

Guerrero

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…Several methods have been reported for diagnosing short-circuit faults, with machine current signature analysis being the most popular method [3][4][5]. In addition, the winding function approach [6][7][8], finite element approach [9,10], frequency signature analysis [11,12], frequency response analysis [13,14], and sound analysis [15] have been studied.…”

Section: Introductionmentioning

confidence: 99%

Identification System for Short-Circuit Fault Points in Concentrated Stator Windings of Motors

Nakamura,

Mizuno

2024

Energies

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Motors serve as the primary power sources in a wide range of industrial fields. In recent years, their application has been expanded to electric and hybrid electric vehicles. As the performance of the motors installed in electric vehicles directly affects human life, it is critical to diagnose the condition of the windings. The objective of this article is to establish a method to identify the short-circuit fault points in concentrated stator windings based on the magnetic flux density distribution near the stator windings. Unlike with distributed windings, the coils are wound around the teeth in concentrated windings. Thus, it is expected that the accurate position specification of the short circuit can be realized if a detailed magnetic flux density distribution over the teeth is obtained with an appropriate magnetic field sensor. The problem of sensor positioning is solved with two stepper motors moving the search coil in the rotational and longitudinal directions independently at specified intervals. The excellent capability of the proposed system is verified through experiments using the stator winding employed in hybrid electric vehicles. The accuracy and sensitivity of the proposed identification system for short-circuit fault points may enable its practical application in industries, for example, shipping and periodic inspections as well as the production management of motors with concentrated stator windings.

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“…Recently, utilizing winding high-frequency electrical response parameters (HFERP) for insulation degradation has become a hot topic. Dayong Zheng et al [19,20] evaluated the insulation aging at different locations of the winding by monitoring the parallel capacitance in the frequency range below and above the resonant frequency. To further prove that the impedance spectrum is related to the turn-to-turn insulation aging, a broadband stator winding insulation model is constructed and a monitoring method of turn-to-turn insulation state based on high-frequency parallel capacitance is proposed.…”

Section: Introductionmentioning

confidence: 99%

Health assessment for low-voltage electromagnetic coils based on fusion of creep degradation mechanism and transformed MD

Yue,

Kai,

Aidong

et al. 2023

Meas. Sci. Technol.

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Low-voltage electromagnetic coils play ever-increasing roles in safety-critical systems, like electromechanical actuators in more electric aircraft and tractors in zero emission vehicles. Identifying insulation degradation prior to the formation of turn-to-turn short can effectively avoid accidental shutdown and enable predictive maintenance for these systems. High-frequency electrical response analysis is currently a promising technique for electromagnetic coil insulation health assessment. However, the correlation between high-frequency electrical response parameters (HFERP) and actual insulation degradation status (AIDS) is still not clear, which brings challenges in insulation health assessment and remaining useful life prediction. Therefore, in this paper, a fusion method based on creep degradation mechanism and transformed mahalanobis distance (MD) for insulation health assessment is proposed. First, correlation analysis between the coil HFERP and the AIDS is performed from coil insulation coating creep degradation point of view. Second, a coil on-line monitoring parameter (OLMP) for monitoring insulation degradation status on-site is constructed based on transformed MD. A correlation model between OLMP and AIDS is consequently built to assist in determining OLMP failure threshold for coil insulation health assessment. Coil accelerated testing shows that the fusion method can be used to assess insulation status prior to the formation of harmful shorts, enabling condition-based maintenance for components or systems that incorporate electromagnetic coils.

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An Improved Online Stator Insulation Monitoring Method Based on Common-Mode Impedance Spectrum Considering the Effect of Aging Position

Cited by 18 publications

References 26 publications

Insulation Condition Assessment in Inverter-Fed Motors Using the High-Frequency Common Mode Current: A Case Study

Insulation Condition Assessment in Inverter-Fed Motors Using the High-Frequency Common Mode Current: A Case Study

Identification System for Short-Circuit Fault Points in Concentrated Stator Windings of Motors

Health assessment for low-voltage electromagnetic coils based on fusion of creep degradation mechanism and transformed MD

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