Farhad Rachidi-Haeri

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Considerable progress has been achieved in the last 10-15 years on the modeling of the lightning phenomenon and on the electromagnetic-field-to-transmission line coupling. The aim of this tutorial is to emphasize the latest developments which took place in the last 2-3 years in particular concerning protection efficiency evaluation using these models and to remind some problems which are still under discussion

The paper presents an automated single-end FPGA-based fault location system for AC/DC power networks. The proposed system is based on the electromagnetic time reversal theory and uses an automated FPGA-based real-time simulator to perform the fault locatio ...

In this paper, a numerical formulation for solving the transmission line equations for a bare wire buried in a dispersive soil is derived. The formulation is developed using the finite-difference time-domain (FDTD) method, including the frequency-dependent nature of the soil electrical parameters. The soil electrical parameters are rigorously represented through the soil model proposed by Alipio and Visacro. It is shown that the results obtained with the proposed formulations are in good agreement with expe

This paper provides a brief description of the model validation activities undertaken within the GEMCAR project. The validation approach is outlined and sample results are presented. The results are also analysed using the frequency selective validation (FSV) technique, which provides both quantitative figures of merit and subjective classifications to describe the quality of comparisons between results that are characterized by high feature densities.

A time reversal process for determining a fault location in an electrical power network comprising multi-conductor lines, comprises measuring at an observation point located anywhere along one of the multi-conductor lines, for each of the conductors of the ...

Significant damages caused by lightning can be avoided by predicting lightning and taking precautionary measures. Here, a machine learning model is developed to nowcast lightning flashes using dew point temperature, precipitation, wind speed, wind directio ...

Upward lightning happens predominantly from tall objects. The channel-base currents associated with upward negative lightning initiated from towers exhibit pulses that can be classified, based on their waveform features and on the concurrence with other pr ...

In this paper, a Three-Dimensional (3D) Moving Window Finite-Difference Time-Domain (MW-FDTD) method is presented based on parallel computing to calculate lightning electromagnetic fields over large-scale terrains. According to the results, the proposed method requires only about × = % of the memory required for the calculation compared to a conventional FDTD method, where and are, respectively, the size of the entire domain in the traditional FDTD method, and the size of the divided blocks in the MW-FDTD m

The propagation characteristics along a single-conductor line above a lossy ground are assessed considering different formulations to compute the ground correction terms in the per-unit-length line parameters. It is shown that the often-used Sunde’s formul ...

Farhad Rachidi-Haeri

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Lightning indirect effects modeling applied to protection design and evaluation

Propagation effects on the electromagnetic field radiated by lightning to tall towers

Single-End FPGA-Based Fault Location System for Radial/Meshed AC/DC Networks based on the Electromagnetic Time Reversal Theory

An FDTD-Based Formulation for Solving the Transmission Line Equations for a Bare Wire Buried in a Dispersive Soil

THE EU FRAMEWORK V PROJECT “GEMCAR”: MODEL VALIDATION ACTIVITIES

Simultaneous Current and Distant Electric Field Waveforms from Upward Lightning: Effect of Ionospheric Reflection

Efficient Method Based on the Electromagnetic Time Reversal to Locate Faults in Power Network

Exploring the portability of ML-based lightning nowcasting models

Pulses in Upward Negative Lightning at the Säntis Tower in Northeastern Switzerland

Lightning Return Strokes to Tall Towers: Ability of Engineering Models to Reproduce Nearby Electromagnetic Fields

On the Efficiency of MW-FDTD Methods Based on Parallel Computing Using OpenMP, OpenACC, and CUDA Python: Application to Lightning Electromagnetic Fields

Comparison of Two Computational Programs for the Calculation of Lightning-Induced Voltages on Distribution Systems

Effect of Traveling-Waves of Current on The Electromagnetic Response of A Tall Franklin Rod Considering Various Lightning Return Stroke Models

Correlation of Lightning Events and Faults in Distribution Power Networks: A Joint Research Project

Influence of the finite ground conductivity on the transient response to lightning of a tower and its grounding

On the Use of the Time Reversal of Electromagnetic Fields to Locate Lightning Discharges

Time-Domain Analysis of an Electromagnetic Lens for a Half Impulse Radiating Antenna

Comparison of Different Formulations to Compute the Ground Return Parameters in the Analysis of High-Frequency Pulse Propagation Along a Wire Above a Lossy Ground

Measurement of lightning currents using a combination of Rogowski coils and B-Dot sensors

Suggestion on Experimental Estimation of Current Portion Measured by Rogowski Coil at the 474 m Level of the CN Tower