@article{GustavsenRahimpour, author = {Gustavsen, B. and Rahimpour, Ebrahim}, title = {High-Frequency Transformer and Reactor Models for Network Studies, Part D: Model interfacing and specifications}, series = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 903}, journal = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 903}, isbn = {978-2-8587-3608-9}, pages = {1 -- 43}, language = {en} } @article{GustavsenRahimpour, author = {Gustavsen, B. and Rahimpour, Ebrahim}, title = {High-Frequency Transformer and Reactor Models for Network Studies, Part B: Black-Box Models}, series = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 901}, journal = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 901}, isbn = {978-2-8587-3606-5}, pages = {1 -- 88}, language = {en} } @article{GustavsenRahimpour, author = {Gustavsen, B. and Rahimpour, Ebrahim}, title = {High-Frequency Transformer and Reactor Models for Network Studies, Part A: White-Box Models}, series = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 900}, journal = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 900}, isbn = {978-2-8587-3605-8}, pages = {1 -- 203}, language = {en} } @article{GustavsenRahimpour, author = {Gustavsen, B. and Rahimpour, Ebrahim}, title = {High-Frequency Transformer and Reactor Models for Network Studies, Part C: Grey Box Models}, series = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 902}, journal = {Conseil International des Grands R{\´e}seaux {\´E}lectriques (CIGRE) TB 902}, isbn = {978-2-8587-3607-2}, pages = {1 -- 102}, language = {en} } @article{YuekselenRahimpour, author = {Y{\"u}kselen, Emir and Rahimpour, Ebrahim}, title = {An improvement in the design process of sustainable peak power rating transformer for solar utility}, series = {International Journal of Electrical Power \& Energy Systems}, volume = {170}, journal = {International Journal of Electrical Power \& Energy Systems}, publisher = {Elsevier BV}, issn = {0142-0615}, doi = {https://doi.org/10.1016/j.ijepes.2025.110928}, pages = {1 -- 13}, abstract = {The transformer industry faces critical challenges, such as maintaining reliable production while meeting rising sustainability requirements. This paper introduces a significant advancement in the design and optimization of a transformer dedicated to a photovoltaic power plant, which exhibits a unique loading cycle distinct from standard power and distribution transformers. The main aim is to minimize the carbon footprint by enhancing the design process to improve operational performance, efficiency, and functional reliability. Such upgrades are essential for transitioning to a zero-emission electricity system and developing green energy projects. In this paper, a transformer has been studied using a combination of electrical design and 3D finite element method simulation to evaluate various design parameters. An optimization study has been conducted using an innovative multi-objective genetic algorithm utilizing a cost function that factors in size and material costs to identify the most efficient and cost-effective design solutions. The proposed design method was then validated through thermal model simulations and experimental tests based on the photovoltaic load cycle. A comparison of critical thermal parameters directly affecting the transformer's lifetime and reliability was also drawn. The results were consistent with the expected outcomes, confirming the effectiveness and reliability of the proposed design methodology.}, language = {en} } @inproceedings{YuekselenRahimpour, author = {Y{\"u}kselen, Emir and Rahimpour, Ebrahim}, title = {An Optimization Approach for Sustainable Transformer Design in Photovoltaic Power Plants", 4th IEEE International Conference on Power Electronics Smart Grid and Renewable Energy}, series = {4th IEEE International Conference on Power Electronics Smart Grid and Renewable Energy}, booktitle = {4th IEEE International Conference on Power Electronics Smart Grid and Renewable Energy}, language = {en} } @inproceedings{MeuserRahimpour, author = {Meuser, Martin and Rahimpour, Ebrahim}, title = {Analyzing of Non-Standard Overvoltages in Different Types of Power Transformer Windings Using Frequency Domain and Time Domain Severity Factors}, series = {CIGRE SC A2 \& D1 Joint Colloquium}, booktitle = {CIGRE SC A2 \& D1 Joint Colloquium}, language = {en} } @inproceedings{RahimpourPortilloDragostinov, author = {Rahimpour, Ebrahim and Portillo, A. and Dragostinov, S.}, title = {Testing Challenges in Impulse Testing of Transformers}, series = {CIGRE SC A2 \& D1 Joint Colloquium}, booktitle = {CIGRE SC A2 \& D1 Joint Colloquium}, language = {en} } @inproceedings{AbouhosseiniDarziRahimpourMirzaieetal., author = {Abouhosseini-Darzi, Mohammad and Rahimpour, Ebrahim and Mirzaie, Mohammad and Shayegani Akmal, Amir Abbas}, title = {Investigating the Effects of Moisture Distribution on the Electric Field and Leakage Current of Power Transformer Bushings}, series = {IEEE Electrical Insulation Conference (EIC)}, booktitle = {IEEE Electrical Insulation Conference (EIC)}, publisher = {IEEE}, isbn = {979-8-3315-2608-5}, issn = {2993-3684}, doi = {10.1109/EIC63069.2025.11123376}, abstract = {Bushings are one of the most important and essential equipment of power transformers. Statistics show that one of the main causes of transformer failures is due to bushing problems. One of the main reasons for bushing failures is the penetration of moisture into its internal insulation system. The moisture affects the dielectric properties and leads to an increase in its leakage current. These effects lead to changes in the electric field of the inner insulating layers of the bushings, so it is necessary to investigate these effects. In this paper, the changes of the electric field in the insulating layers of a sample bushing have been investigated with considering the different moisture distribution between the layers. This evaluation has been done during the moisture diffusion time, from the start of penetration to the time of uniformity of moisture in all layers. Also, the moisture effects on the bushing leakage current under above conditions have been studied. For this purpose, an OIP bushing is modeled in COMSOL Multiphysics software and the simulations are carried out based on Finite Element Method (FEM) and finally the obtained results are analyzed. The results show that the moisture distribution in the bushing can have an important effect on the internal electric fields. Also, according to the results, the moisture distribution inside the bushing does not have a great effect on the leakage current and this current is only affected by the volume of the moisture penetrated inside the bushing.}, language = {en} } @article{AbouhosseiniDarziMirzaieShayeganiAkmaletal., author = {Abouhosseini-Darzi, Mohammad and Mirzaie, Mohammad and Shayegani Akmal, Amir Abbas and Rahimpour, Ebrahim}, title = {Calculation and Analysis of the Electric Field of the OIP Bushings under Internal Humidity and Surface Polluted Conditions using FEM}, series = {Iranian Journal of Electrical and Electronic Engineering}, volume = {21}, journal = {Iranian Journal of Electrical and Electronic Engineering}, number = {3}, doi = {10.22068/IJEEE.21.3.3360}, pages = {1 -- 11}, abstract = {Bushings are one of the most important components of electrical equipment such as power transformers, reactors, capacitors. Most of the installed bushings have Oil-Immersed Paper (OIP) insulation structure. Bushing failure is caused by various reasons such as poor manufacturing process, overloading and also poor installation process, but moisture ingress is one of the main reasons of OIP bushing defect during its operation. In this paper, the electric field distribution of OIP bushings in multiple situations are simulated and effects of moisture distribution are analyzed. The simulations are stablished in polluted and clean surfaces of the studied bushing and done by COMSOL Multiphysics Software. The results show that non-uniform moisture distribution has a significant effect on electric fields of OIP insulation. This effect strongly increases with increasing the pollution on the external insulator of the bushing. © 2025, Iran University of Science and Technology. All rights reserved.}, language = {en} } @inproceedings{AlAbadiRahimpourGamil, author = {Al-Abadi, A. and Rahimpour, Ebrahim and Gamil, Ahmed}, title = {Dynamisches thermisches Verhalten von mit Ester-Fl{\"u}ssigkeit gef{\"u}llten Transformatoren f{\"u}r Offshore-Windkraftanwendungen in kalten Klimazonen}, series = {18th Transformer-Life-Management Konferenz}, booktitle = {18th Transformer-Life-Management Konferenz}, language = {de} } @inproceedings{RahimpourGhorbalMirzaei, author = {Rahimpour, Ebrahim and Ghorbal, Mohammed Bilal and Mirzaei, Hassan Reza}, title = {Application of the Nonlinear Kernel Principal Component Analysis in Detecting Disk-to-Disk Faults along a Transformer Winding}, series = {3rd International Conference - Tesla Innovation Days}, booktitle = {3rd International Conference - Tesla Innovation Days}, language = {en} } @inproceedings{GhorbalMirzaeiRahimpour, author = {Ghorbal, Mohammed Bilal and Mirzaei, Hassan Reza and Rahimpour, Ebrahim}, title = {Detection of Disk Space Variation in Power Transformers using Nonlinear Dimensionality Reduction Algorithm}, series = {24th International Symposium on High Voltage Engineering}, booktitle = {24th International Symposium on High Voltage Engineering}, language = {en} } @inproceedings{MeuserRahimpourEslamian, author = {Meuser, Martin and Rahimpour, Ebrahim and Eslamian, Morteza}, title = {An Inductance Matrix Expansion Method for Transient Analysis of Power Transformer using Single Turn Model}, series = {24th International Symposium on High Voltage Engineering}, booktitle = {24th International Symposium on High Voltage Engineering}, language = {en} } @inproceedings{MeuserRahimpourEslamian, author = {Meuser, Martin and Rahimpour, Ebrahim and Eslamian, Morteza}, title = {Induktivit{\"a}tsmatrixerweiterung f{\"u}r die Transientenanalyse in Leistungstransformatoren}, series = {18th Transformer-Life-Management Konferenz}, booktitle = {18th Transformer-Life-Management Konferenz}, language = {de} } @article{GustavsenRahimpour, author = {Gustavsen, B. and Rahimpour, Ebrahim}, title = {High-Frequency Transformer and Reactor Models for Network Studies}, series = {Electra}, journal = {Electra}, number = {328}, pages = {1 -- 13}, language = {en} }