Dr HADI NADERIALLAF's Outputs (39)

PDIV Modeling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors at Different Cruising Altitudes (2024)
Presentation / Conference Contribution
Naderiallaf, H., Gerada, C., Degano, M., & Gerada, D. (2024, September). PDIV Modeling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors at Different Cruising Altitudes. Presented at 2024 International Conference on Electrical Machines (ICEM), Torino, Italy

This study develops a predictive model for partial discharge inception voltage (PDIV) in turn-to-turn insulation of form-wound windings for inverter-fed motors considering a range of altitudes, from ground to cruise levels. Emphasis is placed on the... Read More about PDIV Modeling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors at Different Cruising Altitudes.

Humidity Impact on Streamer Inception Parameters for Turn-to-Turn Insulation of Inverter-Fed Motors (2024)
Presentation / Conference Contribution
Naderiallaf, H., Ji, Y., Giangrande, P., Galea, M., Degano, M., & Gerada, C. (2024, June). Humidity Impact on Streamer Inception Parameters for Turn-to-Turn Insulation of Inverter-Fed Motors. Presented at 2024 IEEE 5th International Conference on Dielectrics (ICD), Toulouse, France

This study explores the impact of varying relative humidity (RH) levels (30%-90%) at 90°C on streamer inception parameters (SIPs) compared to those at 25°C. Schumann's streamer inception criterion (SCSIC) is used to assess the vulnerability of turn-t... Read More about Humidity Impact on Streamer Inception Parameters for Turn-to-Turn Insulation of Inverter-Fed Motors.

Fillet Radius Impact of Rectangular Insulated Wires on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors (2024)
Journal Article
Naderiallaf, H., Degano, M., Gerada, C., & Gerada, D. (2024). Fillet Radius Impact of Rectangular Insulated Wires on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors. IEEE Transactions on Dielectrics and Electrical Insulation, 31(4), 2084-2093. https://doi.org/10.1109/tdei.2024.3355032

This contribution elucidates the impact of the fillet radius, a geometric feature of rectangular insulated wires not commonly considered, on the partial discharge inception voltage (PDIV) in low-voltage machine turn-to-turn winding insulation. Initia... Read More about Fillet Radius Impact of Rectangular Insulated Wires on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors.

Modeling Air Pressure Impact on PDIV for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors under Different Voltage Waveform Excitations (2024)
Journal Article
Naderiallaf, H., Degano, M., & Gerada, C. (2024). Modeling Air Pressure Impact on PDIV for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors under Different Voltage Waveform Excitations. IEEE Access, 12, 176232-176246. https://doi.org/10.1109/ACCESS.2024.3506053

This study investigates the partial discharge inception voltage (PDIV) in turn-to-turn insulation of form-wound windings in inverter-fed motors under nine different air pressures, ranging from 1013 mbar to 10 mbar. The research evaluates three voltag... Read More about Modeling Air Pressure Impact on PDIV for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors under Different Voltage Waveform Excitations.

Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures (2023)
Journal Article
Naderiallaf, H., Ji, Y., Giangrande, P., & Galea, M. (2024). Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures. IEEE Transactions on Dielectrics and Electrical Insulation, 31(3), 1573-1582. https://doi.org/10.1109/tdei.2023.3338138

This paper models the partial discharge inception voltage (PDIV) as a function of ambient humidity ( H ) at various temperatures ( Ts ) using Schumann’s streamer inception criterion (SCSIC) for turn-to-turn insulation, which is the most vulnerable pa... Read More about Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures.

Air Pressure Impact on the Avalanche Size for Turn-to-Turn Insulation of Inverter-Fed Motors (2023)
Journal Article
Naderiallaf, H., Ji, Y., Giangrande, P., & Galea, M. (2024). Air Pressure Impact on the Avalanche Size for Turn-to-Turn Insulation of Inverter-Fed Motors. IEEE Transactions on Dielectrics and Electrical Insulation, 31(1), 85-94. https://doi.org/10.1109/TDEI.2023.3324287

This paper endeavours to illuminate the variations of various streamer inception parameters (SIPs) with respect to air pressure based on Schumann’s streamer inception criterion (SCSIC). The results based on measured PDIV values and using electric fie... Read More about Air Pressure Impact on the Avalanche Size for Turn-to-Turn Insulation of Inverter-Fed Motors.

Temperature Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors: From Ground Level to Cruising Altitude (2023)
Journal Article
Naderiallaf, H., Ji, Y., Giangrande, P., & Galea, M. (2024). Temperature Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors: From Ground Level to Cruising Altitude. IEEE Transactions on Dielectrics and Electrical Insulation, 31(2), 1044-1053. https://doi.org/10.1109/TDEI.2023.3313569

Considering the turn-to-turn insulation as the most susceptible part to the failure of the electrical machine’s insulation system in inverter-fed motors, this paper aims to elucidate the effect of temperature ( T ) on the streamer inception parameter... Read More about Temperature Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors: From Ground Level to Cruising Altitude.

Assessment of Edgewise Insulated Wire Bend Radius Impact on Dielectric Properties of Turn-to-Turn Insulation through Thermal Ageing (2023)
Journal Article
Naderiallaf, H., Degano, M., & Gerada, C. (2023). Assessment of Edgewise Insulated Wire Bend Radius Impact on Dielectric Properties of Turn-to-Turn Insulation through Thermal Ageing. IEEE Transactions on Dielectrics and Electrical Insulation, https://doi.org/10.1109/TDEI.2023.3309780

This study aims to evaluate the impact of the bending radius of edgewise insulated wires on dielectric properties such as partial discharge inception voltage (PDIV), partial discharge extinction voltage (PDEV), dielectric dissipation factor (DDF), an... Read More about Assessment of Edgewise Insulated Wire Bend Radius Impact on Dielectric Properties of Turn-to-Turn Insulation through Thermal Ageing.

PDIV Modelling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors through Thermal Ageing (2023)
Journal Article
Naderiallaf, H., Degano, M., & Gerada, C. (2023). PDIV Modelling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors through Thermal Ageing. IEEE Transactions on Dielectrics and Electrical Insulation, 1-10. https://doi.org/10.1109/tdei.2023.3307048

This contribution develops the partial discharge inception voltage (PDIV)-FEM-based model based on Schumann’s streamer inception criterion (SCSIC) with respect to thermal ageing time (TAGT) or the insulation lifetime for the turn-to-turn insulation o... Read More about PDIV Modelling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors through Thermal Ageing.

Experimental Comparative Investigation on Alternative and Commercially Available Wire Insulations Based on Partial Discharges Activity (2023)
Presentation / Conference Contribution
Naderiallaf, H., Giangrande, P., & Galea, M. (2023, April). Experimental Comparative Investigation on Alternative and Commercially Available Wire Insulations Based on Partial Discharges Activity. Paper presented at 2023 INSUCON - 14th International Electrical Insulation Conference (INSUCON), Birmingham, United Kingdom

To provide better control, energy efficiency, compactness and improvement of AC motors performance, the employment of power converters has increased during the last decades [1] , [2] . A faster rise time of the repetitive impulsive voltages results i... Read More about Experimental Comparative Investigation on Alternative and Commercially Available Wire Insulations Based on Partial Discharges Activity.

Characterization of PDIV, PDEV and RPDIV in Insulated Wires under Unipolar Repetitive Square Wave Excitations for Inverter-Fed Motors (2023)
Journal Article
Naderiallaf, H., Giangrande, P., & Galea, M. (2023). Characterization of PDIV, PDEV and RPDIV in Insulated Wires under Unipolar Repetitive Square Wave Excitations for Inverter-Fed Motors. IEEE Access, 11, 51047-51063. https://doi.org/10.1109/ACCESS.2023.3279886

The behaviour of partial discharge inception voltage (PDIV), partial discharge extinction voltage (PDEV) and repetitive partial discharge inception voltage (RPDIV) as a function of exposure/poling time under unipolar repetitive square wave excitation... Read More about Characterization of PDIV, PDEV and RPDIV in Insulated Wires under Unipolar Repetitive Square Wave Excitations for Inverter-Fed Motors.

Investigating the Effect of Space Charge Accumulation on Partial Discharge Activity for New and Thermally Aged Glass Fibre Insulated Wire (2023)
Presentation / Conference Contribution
Naderiallaf, H., Giangrande, P., & Galea, M. (2023, April). Investigating the Effect of Space Charge Accumulation on Partial Discharge Activity for New and Thermally Aged Glass Fibre Insulated Wire. Presented at 2023 INSUCON - 14th International Electrical Insulation Conference (INSUCON), Birmingham, UK

In recent years, variable speed drives have been widely employed in aerospace and automotive fields due to their efficiency and versatility benefits. However, electric motors’ reliability remained uncertain when windings are fed by steep-fronted squa... Read More about Investigating the Effect of Space Charge Accumulation on Partial Discharge Activity for New and Thermally Aged Glass Fibre Insulated Wire.

Impact of Unipolar Repetitive Square Wave Voltage Rise Time and Frequency on (RPDIV-PDIV) and (PDIV-PDEV) (2023)
Presentation / Conference Contribution
Naderiallaf, H., Giangrande, P., & Galea, M. (2023, April). Impact of Unipolar Repetitive Square Wave Voltage Rise Time and Frequency on (RPDIV-PDIV) and (PDIV-PDEV). Presented at 2023 INSUCON - 14th International Electrical Insulation Conference (INSUCON), Birmingham, UK

Shorter rise times, faster switching frequencies, and higher DC link voltages are all features of high dV/dt power converters that promote power density and loss reduction . A higher dV/dt increases the risk of partial discharge (PD) between the turn... Read More about Impact of Unipolar Repetitive Square Wave Voltage Rise Time and Frequency on (RPDIV-PDIV) and (PDIV-PDEV).

Glass Fibre Insulated Wire Assessment Under Partial Discharges Activity via Dielectric Dissipation Factor Measurements (2022)
Presentation / Conference Contribution
Naderiallaf, H., Giangrande, P., & Galea, M. (2022, November). Glass Fibre Insulated Wire Assessment Under Partial Discharges Activity via Dielectric Dissipation Factor Measurements. Presented at 2022 9th International Conference on Condition Monitoring and Diagnosis (CMD), Kitakyushu, Japan

This experimental study evaluates the ageing rate associated with partial discharges (PD) activity for a Type-II insulated wire (i.e., Glass fibre), relying on the dielectric dissipation factor (DDF) and capacitance tip-up measurements. The employed... Read More about Glass Fibre Insulated Wire Assessment Under Partial Discharges Activity via Dielectric Dissipation Factor Measurements.

Investigating the Effect of Waveform Characteristics on PDEV, PDIV and RPDIV for Glass Fibre Insulated Wire (2022)
Presentation / Conference Contribution
Naderiallaf, H., Giangrande, P., & Galea, M. (2022, September). Investigating the Effect of Waveform Characteristics on PDEV, PDIV and RPDIV for Glass Fibre Insulated Wire. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

The trends of partial discharge extinction voltage (PDEV), partial discharge inception voltage (PDIV) and repetitive partial discharge inception voltage (RPDIV) as a function of duty cycle, frequency, and rise time are experimentally investigated in... Read More about Investigating the Effect of Waveform Characteristics on PDEV, PDIV and RPDIV for Glass Fibre Insulated Wire.

Experimental considerations on the possible impact of space charge accumulation on partial discharges activity for wire insulations (2022)
Presentation / Conference Contribution
Naderiallaf, H., Giangrande, P., & Galea, M. (2022, July). Experimental considerations on the possible impact of space charge accumulation on partial discharges activity for wire insulations. Presented at 2022 IEEE 4th International Conference on Dielectrics (ICD), Palermo, Italy

The impact of space charge accumulation caused by unipolar square waveform excitation on partial discharge inception voltage (PDIV) and partial discharge extinction voltage (PDEV) for one Type-II insulated wire, i.e., Glass fibre and one Type-I insul... Read More about Experimental considerations on the possible impact of space charge accumulation on partial discharges activity for wire insulations.

A Contribution to Thermal Ageing Assessment of Glass Fiber Insulated Wire Based on Partial Discharges Activity (2022)
Journal Article
Naderiallaf, H., Giangrande, P., & Galea, M. (2022). A Contribution to Thermal Ageing Assessment of Glass Fiber Insulated Wire Based on Partial Discharges Activity. IEEE Access, 10, 41186-41200. https://doi.org/10.1109/ACCESS.2022.3167698

This paper aims to evaluate a Type-II insulated wire (i.e., Glass fibre insulated wire) as a function of thermal ageing time based on partial discharges (PD) activity. Partial discharge inception voltage (PDIV), partial discharge extinction voltage (... Read More about A Contribution to Thermal Ageing Assessment of Glass Fiber Insulated Wire Based on Partial Discharges Activity.

Effect of Voltage Slew Rate on Partial Discharge Phenomenology During Voltage Transient in HVDC Insulation: The Case of Polymeric Cables (2022)
Journal Article
Naderiallaf, H., Seri, P., & Montanari, G. C. (2022). Effect of Voltage Slew Rate on Partial Discharge Phenomenology During Voltage Transient in HVDC Insulation: The Case of Polymeric Cables. IEEE Transactions on Dielectrics and Electrical Insulation, 29(1), 215-222. https://doi.org/10.1109/TDEI.2022.3146436

In this article, the partial discharge (PD) behavior inside a cavity embedded in a dc cable, upon application of a voltage step from transient till steady-state dc, is analyzed as a function of voltage slew rate. The variation of PD characteristics,... Read More about Effect of Voltage Slew Rate on Partial Discharge Phenomenology During Voltage Transient in HVDC Insulation: The Case of Polymeric Cables.

Biaxially oriented silica–polypropylene nanocomposites for HVDC film capacitors: morphology-dielectric property relationships, and critical evaluation of the current progress and limitations (2022)
Journal Article
Rytöluoto, I., Niittymäki, M., Seri, P., Naderiallaf, H., Lahti, K., Saarimäki, E., Flyktman, T., & Paajanen, M. (2022). Biaxially oriented silica–polypropylene nanocomposites for HVDC film capacitors: morphology-dielectric property relationships, and critical evaluation of the current progress and limitations. Journal of Materials Chemistry A, 10(6), 3025-3043. https://doi.org/10.1039/D1TA10336A

Dielectric polymer nanocomposites are considered as one of the most promising insulation material candidates for future capacitive energy storage applications, providing tailorability of charge trapping and transport properties at the nanometric leve... Read More about Biaxially oriented silica–polypropylene nanocomposites for HVDC film capacitors: morphology-dielectric property relationships, and critical evaluation of the current progress and limitations.

HVDC insulation systems: effect of voltage polarity inversion slew rate on partial discharge phenomenology and harmfulness (2021)
Presentation / Conference Contribution
Naderiallaf, H., Ghosh, R., Seri, P., & Montanari, G. C. (2021, November). HVDC insulation systems: effect of voltage polarity inversion slew rate on partial discharge phenomenology and harmfulness. Presented at 22nd International Symposium on High Voltage Engineering (ISH 2021), Xi'an, China and online

The design of HVDC insulation systems has to take into account various factors which can be neglected under AC, especially the dependence of conductivity on temperature and field and the issue of electric field transient during energization and polar... Read More about HVDC insulation systems: effect of voltage polarity inversion slew rate on partial discharge phenomenology and harmfulness.