Yazar "Iqteit, Nassim A." seçeneğine göre listele

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    Investigating and calculating the temperature of hot-spot factor for transformers
    (Institute of Advanced Engineering and Science, 2023) Yahya, Khalid; Attar, Hani; Issa, Haitham; Ramadan Dofan, Jamal Ali; Iqteit, Nassim A.; Yahya, Adel E.M.; Solyman, Ahmed Amin Ahmed
    This article explores the measurement of temperature in transient states, utilizing the principles of heat transfer and thermal-electrical metaphor. The study focuses on the nonlinear thermal resistances present in various locations within a distribution transformer, while taking into account variations in oil physical variables and temperature loss. Real-time data obtained from heat run tests on a 250-MVA-ONAF cooled unit, conducted by the transformer manufacturer, is used to verify the thermal designs. The observations are then compared to the loading framework of the IEC 60076-7:2005 system. The findings of this research provide a better understanding of temperature measurement in transient states, particularly in distribution transformers, and can be applied to the design and development of more efficient and reliable transformer systems. © 2023 Institute of Advanced Engineering and Science. All rights reserved.
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    Simple Mathematical and Simulink Model of Stepper Motor
    (MDPI, ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND, 2022) Iqteit, Nassim A.; Yahya, Khalid O. Moh.; Makahleh, Firas M.; Attar, Hani; Amer, Ayman; Solyman, Ahmad Amin Ahmad; Qudaimat, Ahmad; Tamizi, Khaled
    This paper presents a simple mathematical and Simulink model of a two-phase hybrid stepper motor, where ignoring the permeance space harmonics of the hybrid stepper motor is regarded as the main physical assumption in this article. Moreover, the dq transformation method is adopted as the main mathematical approach for the derivation of the proposed model, where simple voltages, currents, and torque equations are obtained and used to build the proposed Simulink and circuit model of the stepper motor. The validity and the effectiveness of the proposed model are examined by comparing its results with the results collected from the Simulink model in the library of Matlab. The obtained simulation results showed that the proposed model achieved a high simplicity and high accuracy when compared with conventional models.
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    Simulink model of transformer differential protection using phase angle difference based algorithm
    (Institute of Advanced Engineering and Science, 2020) Iqteit, Nassim A.; Yahya, Khalid
    An application of phase-angle-difference based algorithm with percentage differential relays is presented in this paper. In the situation where the transformer differential relay is under magnetizing inrush current, the algorithm will be utilized to block the process. In this study, the technique is modeled and implemented using Simulink integrated with MATLAB. The real circuit model of power transformer and current transformers are considered in the simulation model. The results confirmed the effectiveness of the technique in different operation modes; such as, magnetizing inrush currents, current transformers saturation and internal transformer faults. © 2020, Institute of Advanced Engineering and Science. All rights reserved.