Effects of Resins on Partial Discharge Activity and Lifetime of Insulation Systems Used in eDrive Motors and Automotive Industries

Moghadam, Davoud Esmaeil; Herold, C.; Zbinden, Rolf

doi:10.1109/eic47619.2020.9158737

Cited by 14 publications

(3 citation statements)

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“…Both the binder and the impregnating resin used to impregnate mica tapes under vacuum and pressure (vacuum pressure impregnation [VPI]) play vital roles in enhancing the mechanical strength and electrical properties of the insulation system, as different types of resins, such as epoxy, silicone, or polyester, exhibit diverse and dissimilar behaviours. It is shown that resin has a substantial impact on the PD activity and lifetime of the insulation system [44], hence epoxy resin was used in three sample systems. Furthermore, the substrate, onto which the mica‐based insulation system is applied, also contributes to its overall reliability.…”

Section: Resultsmentioning

confidence: 99%

A novel approach towards parametric assessment of reliability and resilience of high voltage mica‐based insulation systems by statistical analysis of experimental failure data

Negari,

Esmaeil Moghadam

2024

High Voltage

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Insulation systems in high‐voltage electric machines play a pivotal role in the reliable operation and longevity of the equipment. Mica‐based insulation materials have proven to possess and maintain excellent dielectric properties in the long run and prevent premature insulation degradation. Numerous qualifications tests, such as voltage endurance, are outlined in IEC and IEEE standards. The authors, however, take a different parametric approach, opting for reliability assessment of insulation systems using derived three‐parameter Weibull models. Therefore, instead of simple pass–fail criteria, empirical data is employed to determine failure rate probabilities quantitatively and objectively. Experimental data, including breakdown, dissipation factor, and partial discharge measurements, are used to construct the Weibull distribution model to predict fault and failure rates and calculate hazard functions. The rigorous examinations interpreted through the analytical model help assess insulation system resilience and particularly the impact of electrical field stress and mica content. Variation of electrical stress from 66.75 to 71.20 V/mil demonstrated how the mean time to failure of the system changed from 146.4 to 85.1 at 3 Un, hence identifying opportunities for design improvement and uncovering performance boundaries. Ultimately, the developed framework enhances comprehension of insulation system failure probabilities, guiding design decisions and ensuring a secure and reliable operation of electrical machines across applications.

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Section: Resultsmentioning

confidence: 99%

A novel approach towards parametric assessment of reliability and resilience of high voltage mica‐based insulation systems by statistical analysis of experimental failure data

Negari,

Esmaeil Moghadam

2024

High Voltage

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“…Nowadays, aircraft operate at voltages below 1kV; however, higher voltage levels are being considered in new developments. For example, NASA has envisioned voltage levels of at least 610kV for more electric aircraft [29,37,38]. The aviation and space industry is carefully analyzing these trends and standardizations due to the required safety and reliability aspects that are crucial in these applications.…”

Section: Insulation Systems Of Transportation Devicesmentioning

confidence: 99%

Effect of Magnetic Field on Partial Discharge Dynamics in Insulation Systems of Transportation Power Devices

Florkowski

2022

IEEE Trans. Transp. Electrific.

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The globally observed trend toward electrically supplied devices is common in the transportation segment. Traditionally, the performance of electrical insulation has been assessed with respect to electric stresses and endurance. In all current-carrying devices, magnetic fields will also be superimposed on electric ones; therefore, the influence of a magnetic field's exposure on partial discharge (PD) dynamics is an actual research topic. This problem is important in the T This article has been accepted for publication in IEEE Transactions on Transportation Electrification.

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“…PDs may cause accelerated insulation ageing. Air cavities or other delaminations due to TEAM stresses increase the possibility of PD creation and can lead to insulation system deterioration due to chemical degradation and physical attack by nitrogen ions [10][11][12][13][14][15].…”

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confidence: 99%

Investigation of Factors Affecting Partial Discharges on Epoxy Resin: Simulation, Experiments, and Reference on Electrical Machines

et al. 2021

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In Power Systems, Synchronous Generators (SGs) are mostly used for generating electricity. Their insulation system, of which epoxy resin is a core component, plays a significant role in reliable operation. Epoxy resin has high mechanical strength, a characteristic that makes it a very good material for reliable SG insulation. Partial Discharges (PDs) are a constant threat to this insulation since they cause deterioration and consequential degradation of the aforementioned material. Therefore, it is very important to detect PDs, as they are both a symptom of insulation deterioration and a means to identify possible faults. Offline and Online PDs Tests are described, and a MATLAB/Simulink model, which simulates the capacitive model of PDs, is presented in this paper. Moreover, experiments are carried out in order to examine how the flashover voltage of epoxy resin samples is affected by different humidity levels. The main purpose of this manuscript is to investigate factors, such as the applied voltage, number, and volume of water droplets and water conductivity, which affect the condition of epoxy resin, and how these are related to PDs and flashover voltages, which may appear also in electrical machines’ insulation. The aforementioned factors may affect the epoxy resin, resulting in an increase in PDs, which in turn increases the overall Electrical Rotating Machines (EMs) risk factor.

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Effects of Resins on Partial Discharge Activity and Lifetime of Insulation Systems Used in eDrive Motors and Automotive Industries

Cited by 14 publications

References 1 publication

A novel approach towards parametric assessment of reliability and resilience of high voltage mica‐based insulation systems by statistical analysis of experimental failure data

A novel approach towards parametric assessment of reliability and resilience of high voltage mica‐based insulation systems by statistical analysis of experimental failure data

Effect of Magnetic Field on Partial Discharge Dynamics in Insulation Systems of Transportation Power Devices

Investigation of Factors Affecting Partial Discharges on Epoxy Resin: Simulation, Experiments, and Reference on Electrical Machines

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