@inproceedings{FaridiKharezyRahimpouretal., author = {Faridi, Mohsen and Kharezy, Mohammad and Rahimpour, Ebrahim and Mirzaei, Hassan Reza}, title = {Localization of Turn-to-Turn fault in transformers using artificial neural networks and winding transfer function}, series = {10th IEEE International Conference on Solid Dielectrics (ICSD), Potsdam, Germany, 4-9 July 2010}, booktitle = {10th IEEE International Conference on Solid Dielectrics (ICSD), Potsdam, Germany, 4-9 July 2010}, language = {en} } @inproceedings{RahimpourGhorbalMirzaei, author = {Rahimpour, Ebrahim and Ghorbal, Mohammed Bilal and Mirzaei, Hassan Reza}, title = {Evaluating the Influence of External Compensators on Chopped Impulse Waves in Power Transformer Testing}, series = {2024 IEEE International Conference on High Voltage Engineering and Applications, Berlin, Germany}, booktitle = {2024 IEEE International Conference on High Voltage Engineering and Applications, Berlin, Germany}, publisher = {IEEE}, isbn = {979-8-3503-7498-8}, doi = {10.1109/ICHVE61955.2024.10676122}, pages = {969 -- 972}, abstract = {Applying lightning impulse tests on high-voltage transformers plays a crucial role in evaluating their insulation system. The performance of the dielectric system in newly produced power transformers must satisfy the requirements of both full and chopped wave tests. To conduct these tests, standard full and chopped impulses are generated using the well-known Marx generator. The wave shape parameters of these impulses must fulfil the requirements that are specified in international standards such as IEC 60076. The excessive voltage collapse rate as well as the high amplitude of the first peak of the resulting overswing following the chopping time, highly stress the dielectric system of the power transformers. To resolve these issues, external elements may be added to the chopping circuit. These additional elements are essential in stabilizing the waveform by preventing excessive voltage collapse rate and controlling the peak of the first swing after chopping. Furthermore, some transformers with high power ratings may possess windings with very low inductance or high capacitance, which can undesirably impact the shape and parameters of the resulting full wave. To address these critical situations and bring the full wave parameters within the allowed limits, engineers in high-voltage laboratories employ some compensators like the Glaninger circuit in impulse circuits. It is important to study the effects of such compensators on chopped impulse parameters. This paper aims to investigate the impact of the mentioned external elements and compensators on the parameters of the chopped wave impulses. Specifically, the study focuses on assessing the influence of these compensators on voltage collapse and the peak amplitude of the first swing after chopping. By analyzing and understanding these effects, researchers and engineers can gain valuable insights into the performance and optimization of lightning impulse tests on power transformers, ultimately contributing to the advancement of high-voltage laboratory practices.}, language = {en} } @inproceedings{GhorbalMirzaeiRahimpouretal., author = {Ghorbal, Mohammed Bilal and Mirzaei, Hassan Reza and Rahimpour, Ebrahim and Rabih, S.}, title = {Analyzing the Possibility of Improving Waveform Shape in Lightning Impulse Testing of Distribution Transformers}, series = {28th Electrical Power Distribution Conference, Zanjan, Iran}, booktitle = {28th Electrical Power Distribution Conference, Zanjan, Iran}, pages = {1 -- 5}, language = {en} } @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} }