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Your search keyword '"Golsorkhi, Mohammad S."' showing total 31 results
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31 results on '"Golsorkhi, Mohammad S."'

1. Detection of Winding Axial Deformation in Power Transformers by UWB Radar Imaging

Author

Golsorkhi, Mohammad S., Hejazi, M. A., Gharepetian, G. B., and Mosayebi, Razieh

Subjects
Electrical Engineering and Systems Science - Signal Processing, Electrical Engineering and Systems Science - Systems and Control
Abstract

In this paper, a novel method for detecting transformer winding axial displacement has been presented. In this method, which is based on UWB radar imaging, a UWB pulse is transmitted to the transformer winding and the reflection from it is received and recorded. By changing the antenna position this process is repeated on several points along the axis of the winding. The measured signals are mapped to a 2-D image of the winding. By analyzing this image, the axial displacement of the winding can detected and the magnitude of it is determined with an acceptable precision. Simulation results are provided to verify the proposed method.

Published
2021

2. Detection of Transformer Winding Axial Displacement by Kirchhoff and Delay and sum Radar Imaging Algorithms

Author

Golsorkhi, Mohammad S., Mosayebi, R., Hejazi, M. A., Gharehpetian, G. B., and Sheikhzadeh, H.

Subjects
Electrical Engineering and Systems Science - Systems and Control, Electrical Engineering and Systems Science - Signal Processing
Abstract

In this paper, a novel method for in detail detection of the winding axial displacement in power transformers based on UWB imaging is presented. In this method, the radar imaging process is implemented on the power transformer by using an ultra-wide band (UWB) transceiver. The result is a 2-D image of the transformer winding, which is analyzed to determine the occurrence as well as the magnitude of the winding axial displacement. The method is implemented on a transformer model. The experimental results illustrate the effectiveness of the proposed method.

Published
2021

16. A Nonisolated High Step-Up Three-Port Soft-Switched Converter With Minimum Switches.

Author

Cheraghi, Rasoul, Adib, Ehsan, and Golsorkhi, Mohammad S.

Subjects
ZERO voltage switching, DC-to-DC converters, HYBRID power systems, Q-switched lasers, SEMICONDUCTOR diodes
Abstract

In this article, a nonisolated high step-up three-port converter is proposed based on the single-ended primary-inductor converter. The proposed converter includes two switches, which are turned on under zero voltage switching or low-voltage condition intrinsically. The overall number of elements used in the converter is small. Furthermore, the conduction losses are reduced by reducing the number of the semiconductor elements in both battery and photovoltaic (PV) current flow paths. The input inductor is not coupled to any inductors to reduce the PV current ripple and enhance the realization of maximum power point tracking (MPPT). Since low-voltage switches with low on-resistance are selectable, conduction losses are reduced. All modes of operation in the steady-state condition are discussed and design considerations in each mode are presented. Finally, the experimental prototype of the proposed converter with a 24 V PV source, 36 V battery pack, and a 380 V-200 W load is presented. [ABSTRACT FROM AUTHOR]

Published
2021
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