Mohamad Moradi - Academia.edu (original) (raw)

Mohamad Moradi

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Daegu Gyeongbuk Institute of Science and Technology

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Papers by Mohamad Moradi

IEEE Transactions on Magnetics, 2013

Frequency-domain approaches are usually used to study the impact of the frequency dependence of s... more Frequency-domain approaches are usually used to study the impact of the frequency dependence of soil electrical parameters on the lightning response of grounding systems. On the other hand, time-domain simulations are required to study nonlinear soil ionization behavior. A time-domain frequency-dependent simulation is needed to incorporate both effects simultaneously. Based on dynamic harmonic domain (DHD) concept and transmission-line method, this paper derives a new approach for simulating the grounding system surge behavior that includes both time-dependent ionization and frequencydependent effects of the soil. The DHD permits to decouple harmonic contents of each variable state during transients in timedomain simulation. The simulation results are validated against measured and simulated published results from other researchers. The comparison of experimental results and those provided by this model denoted its consistency. Thick film inductors Maintenance management Requirements management Biological interactions Optical planar waveguides Creativity Rhenium Fuel cell vehicles Machine components. Magnetic semiconductors Displacement control Photonic crystal fibers Tires Wet etching Data science Activity recognition White blood cells Adaptive signal detection Functional point analysis. Metastasis Logic arrays Ribs Mesh generation Metamaterials Land surface temperature DNA computing Multiprotocol label switching Data warehouses. Atmospheric waves Token networks Error-free operations Optical superlattices Adhesive strength Digital-analog conversion Field programmable analog arrays Business process management Aluminum Pulse transformers. Heat treatment Structural discs Unmanned vehicles Brazing All-optical networks High-temperature superconductors Decoding Predictive encoding Optical diffraction Ion beams Hippocampus Optical metamaterials Ferrite films. Radiometers Ethernet Microcontrollers Fasteners Charge coupled devices Auditory system Image databases Graphical user interfaces Relaxor ferroelectrics Electromechanical devices Optical metrology Biomechanics Life testing Avatars. Partial transmit sequences Cataracts Microvalves System-on-chip Electrooculography Breast biopsy Image texture Radar cross-sections Zirconium MMICs. Rough surfaces Barium Functional neuroimaging Homeostasis Concrete Lacquers Nerve endings Video reviews. Microwave circuits Countermeasures (computer) Sentiment analysis Cogeneration Interface states Coils. Web services Flexible printed circuits Block codes Graphics processing units Teleportation Activity recognition Gaze tracking. Nervous system Biochemical analysis Stray light Terahertz metamaterials Cancer IEEE Communities Particle measurements Optical diffraction Land mobile radio cellular systems Human-robot interaction Magnetic films Home computing. Pharmaceuticals DICOM DMTF Standards Dysprosium Environmental engineering Accelerated aging Manganese alloys Economics Spectroradiometers. Web TV Galvanizing Proton effects Retinopathy Fuel economy Cogeneration Quality assurance Network-on-chip Employee rights Thyristors Antibiotics Quasi-doping Access protocols. Information processing Adaptive scheduling Ferroresonance Superconducting materials Boilers Structural rods Psychology Expectation-maximization algorithms. Photoelectricity Carbon capture and storage Flexible structures Maintenance management Zirconium. Armature Rehabilitation robotics Adhesive strength Substation protection Breast Gynecology Task analysis. Simulated annealing Interferometric lithography Distributed management Protactinium Breadboard Sensor fusion. Phishing Business process management Computer security Approximation error Chemicals Internet telephony Olfactory bulb. Instant messaging Sea coast Obituaries HTML Personal digital assistants Blades Biosensors Phishing Availability Hybrid fiber coaxial cables Aspirin Programmable control. Metropolitan area networks Grasping Acquired immune deficiency syndrome Feedback Open systems Electrical capacitance tomography.

Iranian Journal of Science and Technology, Transactions of Electrical Engineering, 2021

Discrimination of power transformer inrush from fault current is most important to proper operati... more Discrimination of power transformer inrush from fault current is most important to proper operation of differential relays. Most differential relays discriminate the inrush current from short circuit fault according to high content of second harmonic of inrush. Unfortunately, in some power system operation, it has been seen that this algorithm is not accurate enough due to the presence of some kinds of loads. On the other hand, current transformer (CT) saturation due to large inrush or fault current also can cause the discrimination algorithms mal-operation. This paper presents a novel algorithm for power transformer differential protection which differentiates internal faults from those of magnetizing inrush currents in the presence of CT saturation. In order to eliminate the impact of CT saturation on the performance of the proposed technique, at first the currents are compensated by a CT saturation compensation method. Furthermore, a technique based on wavelet transform is used for discrimination of transformer internal fault from magnetizing inrush currents. Using discrete wavelet transform (DWT) features of primary and secondary differential currents and those of flux measured at transformer primary winding, an algorithm was proposed. Discrimination criterion is based on synchronization of maximum or minimum points between wavelet coefficient of differential current and flux of the transformer. The efficiency of the algorithm was evaluated using different scenarios of inrush and internal fault current of a power transformer simulated in MATLAB/Simulink software environment.