Outputs (7)

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.

On the calculation of the dielectric time constant of DC insulators containing cavities (2021)
Presentation / Conference Contribution
Naderiallaf, H., Seri, P., & Montanari, G. C. (2021, December). On the calculation of the dielectric time constant of DC insulators containing cavities. Presented at 2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Vancouver, BC, Canada

This paper presents an analytical derivation of the dielectric time constant of DC insulators containing cavities. It is based on two different methods including Maxwell- Wagner-Sillars (MWS) equations and an equivalent charging circuit. It is shown... Read More about On the calculation of the dielectric time constant of DC insulators containing cavities.

Reliability of HVDC and MVDC Electrical Asset: The Challenge of Insulation Design (2021)
Presentation / Conference Contribution
Montanari, G. C., Ghosh, R., Naderiallaf, H., & Seri, P. (2021, July). Reliability of HVDC and MVDC Electrical Asset: The Challenge of Insulation Design. Presented at Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials, Johor Bahru, Malaysia

Reliability of DC electrical asset components has not been investigated as broadly as for sinusoidal AC supply. On the other hand, DC assets are more and more common, and they are forecasted to grow in number, power, and voltage in the near future. T... Read More about Reliability of HVDC and MVDC Electrical Asset: The Challenge of Insulation Design.

A Review of Knowledge-Based Defect Identification via PRPD Patterns in High Voltage Apparatus (2021)
Journal Article
Shahsavarian, T., Pan, Y., Zhang, Z., Pan, C., Naderiallaf, H., Guo, J., Li, C., & Cao, Y. (2021). A Review of Knowledge-Based Defect Identification via PRPD Patterns in High Voltage Apparatus. IEEE Access, 9, 77705-77728. https://doi.org/10.1109/access.2021.3082858

Partial discharge (PD) as one of well-known signatures of defects in the insulation system of high voltage equipment has been studied over eight decades. It is of a great interest to power grid operators and owners to identify and distinguish local w... Read More about A Review of Knowledge-Based Defect Identification via PRPD Patterns in High Voltage Apparatus.

PP/PP-HI/silica nanocomposites for HVDC cable insulation: Are silica clusters beneficial for space charge accumulation? (2021)
Journal Article
He, X., Rytöluoto, I., Seri, P., Anyszka, R., Mahtabani, A., Naderiallaf, H., Niittymäki, M., Saarimäki, E., Mazel, C., Perego, G., Lahti, K., Paajanen, M., Dierkes, W., & Blume, A. (2021). PP/PP-HI/silica nanocomposites for HVDC cable insulation: Are silica clusters beneficial for space charge accumulation?. Polymer Testing, 98, Article 107186. https://doi.org/10.1016/j.polymertesting.2021.107186

New potential High Voltage Direct Current (HVDC) cable insulation materials based on nanocomposites are developed in this study. The nanocomposites are produced by blending of polypropylene (PP), propylene-ethylene copolymer (PP–HI) and a modified fu... Read More about PP/PP-HI/silica nanocomposites for HVDC cable insulation: Are silica clusters beneficial for space charge accumulation?.

Designing a HVDC Insulation System to Endure Electrical and Thermal Stresses Under Operation. Part I: Partial Discharge Magnitude and Repetition Rate During Transients and in DC Steady State (2021)
Journal Article
Naderiallaf, H., Seri, P., & Montanari, G. C. (2021). Designing a HVDC Insulation System to Endure Electrical and Thermal Stresses Under Operation. Part I: Partial Discharge Magnitude and Repetition Rate During Transients and in DC Steady State. IEEE Access, 9, 35730-35739. https://doi.org/10.1109/access.2021.3062440

This paper has the purpose to investigate HVDC insulation design considering real operating conditions, when DC steady-state is affected by frequent voltage transients or load variations that may be present during all life. Electrical field distribut... Read More about Designing a HVDC Insulation System to Endure Electrical and Thermal Stresses Under Operation. Part I: Partial Discharge Magnitude and Repetition Rate During Transients and in DC Steady State.

Dielectric Performance of Silica-Filled Nanocomposites Based on Miscible (PP/PP-HI) and Immiscible (PP/EOC) Polymer Blends (2021)
Journal Article
He, X., Seri, P., Rytoluoto, I., Anyszka, R., Mahtabani, A., Naderiallaf, H., Niittymaki, M., Saarimaki, E., Mazel, C., Perego, G., Lahti, K., Paajanen, M., Dierkes, W., & Blume, A. (2021). Dielectric Performance of Silica-Filled Nanocomposites Based on Miscible (PP/PP-HI) and Immiscible (PP/EOC) Polymer Blends. IEEE Access, 9, 15847-15859. https://doi.org/10.1109/access.2021.3052517

This study compares different polymer-nanofiller blends concerning their suitability for application as insulating thermoplastic composites for High Voltage Direct Current (HVDC) cable application. Two polymer blends, PP/EOC (polypropylene/ethylene-o... Read More about Dielectric Performance of Silica-Filled Nanocomposites Based on Miscible (PP/PP-HI) and Immiscible (PP/EOC) Polymer Blends.