Publications de Keyhan Sheshyekani

Tower and Path-Dependent Voltage Effects on the Measurement of Grounding Impedance for Lightning Studies

Marcos Rubinstein, Keyhan Sheshyekani, Hamidreza Karami, Antonio Sunjerga

We present an analysis aimed at evaluating the effect of the presence of the tower on the measurement of the grounding impedance. The Numerical Electromagnetics Code NEC-4 is used for the full-wave modeling of the structure including the tower and its foot ...

2019

Locating lightning strikes and flashovers along overhead power transmission lines using electromagnetic time reversal

Gianluca Antonini, Mario Paolone, Keyhan Sheshyekani, Reza Razzaghi, Marco Scatena

The paper presents a method to identify the location of direct lightning strikes to overhead transmission lines and potential subsequent flashover(s). The method is based on the electromagnetic time reversal theory and relies on the use of a single measure ...

Elsevier2018

Mixed-Potential Integral Equation for Full-Wave Modeling of Grounding Systems Buried in a Lossy Multilayer Stratified Ground

Farhad Rachidi-Haeri, Keyhan Sheshyekani, Hamidreza Karami

The paperpresents a comprehensive approach for full-wave modeling of grounding systems buried in a multilayer stratified ground. The dyadic spectral domain Green's function associated with the multilayer stratified ground is first derived. This Green's fun ...

Institute of Electrical and Electronics Engineers2017

Analysis of lightning electromagnetic field propagation in mountainous terrain and its effects on ToA-based lightning location systems

Farhad Rachidi-Haeri, Marcos Rubinstein, Keyhan Sheshyekani, Mohammad Azadifar, Dongshuai Li, Zhaoyang Wang, Qilin Zhang

In this paper, we analyze the propagation effects on lightning-radiated electromagnetic fields over mountainous terrain by using a three-dimensional (3-D) finite difference time domain (FDTD) method. We also discuss the time delay error in the time-of-arri ...

Amer Geophysical Union2016

The Influence of the Slope Angle of the Ocean–Land Mixed Propagation Path on the Lightning Electromagnetic Fields

Farhad Rachidi-Haeri, Keyhan Sheshyekani, Dongshuai Li

In this paper, lightning electromagnetic fields in the presence of an ocean-land mixed propagation path having different configurations are evaluated using a finite-element-based full-wave approach. The simulations are conducted considering lightning strik ...

Institute of Electrical and Electronics Engineers2015

Propagation Effects on Lightning Magnetic Fields Over Hilly and Mountainous Terrain

Farhad Rachidi-Haeri, Marcos Rubinstein, Keyhan Sheshyekani, Dongshuai Li, Qilin Zhang, Zheng Wang

2015

Lightning Electromagnetic Fields and Their Induced Currents on Buried Cables. Part II: The Effect of a Horizontally Stratified Ground

Farhad Rachidi-Haeri, Mario Paolone, Keyhan Sheshyekani

We use a finite element method (FEM) to evaluate the effect of a horizontally stratified two-layer ground on underground lightning electromagnetic fields and their induced currents on the shield of buried cables. It is shown that the azimuthal component of ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Lightning Electromagnetic Fields and Their Induced Currents on Buried Cables. Part I: The Effect of an Ocean-Land Mixed Propagation Path

Farhad Rachidi-Haeri, Keyhan Sheshyekani

We use a full-wave finite-element-based solution of Maxwell's equations for the evaluation of lightning electromagnetic fields inside a vertically stratified, two-layer ground (ocean-land mixed propagation path) and their induced currents on the shield of ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Evaluation of Lightning-Induced Currents on Cables Buried in a Lossy Dispersive Ground

Farhad Rachidi-Haeri, Mario Paolone, Abdenabi Mimouni, Keyhan Sheshyekani

The paper discusses the effect of frequency dependence of soil electrical parameters (also called soil dispersion) on lightning currents induced on the shield of buried cables. To this aim, a full-wave approach based on the finite element method is used in ...

2014

Lightning Induced Currents on River-Crossing Buried Cables

Farhad Rachidi-Haeri, Keyhan Sheshyekani

2014

Lightning Electromagnetic Fields and Their Induced Voltages on Overhead Lines: the Effect of a Non-flat Lossy Ground

Farhad Rachidi-Haeri, Keyhan Sheshyekani

2014

Evaluation of Lightning Electromagnetic Fields and Their Induced Voltages on Overhead Lines Considering the Frequency Dependence of Soil Electrical Parameters

Farhad Rachidi-Haeri, Carlo Alberto Nucci, Mario Paolone, Keyhan Sheshyekani

This paper presents a comprehensive study on the effect of the frequency dependence of soil electrical parameters on the lightning radiated electromagnetic fields as well as their associated induced voltages on overhead lines. To this aim, a fullwave appro ...

Institute of Electrical and Electronics Engineers2013

Application of the Matrix Pencil Method to Rational Fitting of Frequency-Domain Responses

Farhad Rachidi-Haeri, Mario Paolone, Keyhan Sheshyekani, Hamidreza Karami

This paper presents a general methodology based on the matrix pencil method (MPM) for the fitting of frequency-domain responses in order to be properly represented in time-domain analysis. By virtue of the proposed method, a rational fitting of the frequen ...

Ieee-Inst Electrical Electronics Engineers Inc2012

On the Mechanism of Current Pulse Propagation Along Conical Structures: Application to Tall Towers Struck by Lightning

Farhad Rachidi-Haeri, Marcos Rubinstein, Keyhan Sheshyekani, Abdolhamid Shoory

We discuss in this paper the propagation of lightning current pulses along conical tall structures. Although the dominant mode of an infinitely long conical transmission line is transverse electric and magnetic (TEM), such a structure can also support high ...

2012

A Full Wave Analysis of Lightning-Induced Voltages on Distribution Lines Considering the Conductive Coupling between the Lightning Channel and the Grounding System

Farhad Rachidi-Haeri, Carlo Alberto Nucci, Mario Paolone, Keyhan Sheshyekani

2012

Frequency-domain analysis of ground electrodes buried in an ionized soil when subjected to surge currents: A MoM–AOM approach

Farhad Rachidi-Haeri, Keyhan Sheshyekani

A frequency-domain method is proposed for the transient analysis of grounding systems with ionized soil. The method involves two stages. First, the grounding system is transformed into a nonlinear equivalent circuit, in which the frequency-domain circuit p ...

Elsevier2011

A New Method for the Inclusion of Frequency Domain Responses in Time Domain Codes

Farhad Rachidi-Haeri, Keyhan Sheshyekani, Hamidreza Karami

2011

Analysis of Transmission Lines With Arrester Termination, Considering the Frequency-Dependence of Grounding Systems

Farhad Rachidi-Haeri, Mario Paolone, Keyhan Sheshyekani

The paper proposes a modeling technique to analyze the response of a transmission line terminated by a lightning arrester connected to a grounding system buried in a lossy ground. In this technique, the transmission line is modeled in the frequency domain ...

Institute of Electrical and Electronics Engineers2010

The Impact of the Grounding System on the Lightning Performance of Transmission Lines: a Sensitivity Analysis

Farhad Rachidi-Haeri, Mario Paolone, Keyhan Sheshyekani

2010

Impact of Grounding Systems Frequency Dependency on Lightning Arresters Transient Response

Farhad Rachidi-Haeri, Mario Paolone, Keyhan Sheshyekani

2009