An Analysis of Frequency-Dependent Soil Models: Influence on the Transient Responses

Pascoalato, Tainá Fernanda Garbelim; Araújo, Anderson Ricardo Justo de; Colqui, Jaimis Sajid León; Kurokawa, Sérgio; Filho, José Pissolato

doi:10.1109/induscon51756.2021.9529891

Cited by 1 publication

(6 citation statements)

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“…In (1), ω = 2π f [rad/s] is the angular frequency, f [Hz] is the frequency, Z i (ω) [Ω/m] is the internal impedance due to the Skin effect [1], Z e (ω) [Ω/m] is the external matrix due to other conductors above soil [34] and Z g (ω) [Ω/m] is the ground-return impedance associated to the penetrating magnetic field resulting in the induced currents into the soil [14,35]. In (2), C t [F/km] is the equivalent transversal capacitance, Y e (ω) [S/m] is the external admittance considering a constant parameter soil and Y g (ω) [S/m] is the ground-return admittance corresponding to a correction term for FD soils.…”

Section: Modeling Of Ohtlsmentioning

confidence: 99%

“…Accurate modeling of OHTLs is required to study the electromagnetic transients on power systems, especially for those generated by lightning strikes [1,2]. OHTLs are characterized by its FD distributed parameters where the voltage and current behave as propagating waves.…”

Section: Introductionmentioning

confidence: 99%

“…OHTLs are characterized by its FD distributed parameters where the voltage and current behave as propagating waves. To calculate the transient responses on a certain OHTL, the solving methods can be classified into two categories [3]: (1) phase-domain methods and (2) modaldomain methods. In (1), the fitting techniques in the s-plane requires an accurate calculation of travelling time τ of the OHTLs for frequency-domain characteristic admittance Y c (ω) and propagation wave function H(ω) functions to properly calculate the time-domain responses as detailed in [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…To calculate the transient responses on a certain OHTL, the solving methods can be classified into two categories [3]: (1) phase-domain methods and (2) modaldomain methods. In (1), the fitting techniques in the s-plane requires an accurate calculation of travelling time τ of the OHTLs for frequency-domain characteristic admittance Y c (ω) and propagation wave function H(ω) functions to properly calculate the time-domain responses as detailed in [4][5][6]. Additionally, the traditional Universal Line Model (ULM), depending on the fitting process in the rational-function approximation, may require a high computation time, being this an important factor in the real time simulators [7].…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, many authors have proposed different closed-form expressions based on the soil samples collected in field and laboratory measurements [22,23]. It is demonstrated that when the soil models are considered, the transient voltage peaks on OHTL are significantly reduced in comparison to those computed for the frequency-constant soil [1,24]. Accuracy on voltage peaks is necessary to compute the electrical supportability of many components in power systems such as insulator strings, pre-insertion resistors, circuit breakers and surge arresters [1,2].…”

Section: Introductionmentioning

confidence: 99%

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A Comparison of Frequency-Dependent Soil Models: Electromagnetic Transient Analysis of Overhead Transmission Lines Using Modal Decomposition

et al. 2022

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This article investigates the influence of four causal frequency-dependent (FD) soil models and their impact on the responses of a multiphase overhead transmission line (OHTL) with ground wires, generated by a lightning strike. The FD models proposed by Longmire-Smith (LS), Messier (M), Portela (P) and Alípio-Visacro (AV) are considered. The ground-return impedance and admittance matrices are computed with the Nagakawa approach for both frequency-constant and FD soil models. The frequency-domain modal voltages and time-domain transient voltages are assessed in this work. Modal decomposition technique is used to study the attenuation constant, propagation velocity and voltages for each propagation mode. Simulations are carried out in a frequency range of 100 Hz to 10 MHz, for OHTLs with lengths of 1 and 10 km, on soils of 700 and 4000 Ω·m. Simulation results demonstrated that the Portela (P) model has resulted in more significant variation in the ground-return impedance and admittance, constant attenuation and propagation velocity in which a pronounced variation, especially at the high frequencies, is seen. On the other hand, Longmire-Smith (LS) and Messier (M) have produced similar results in both frequency and time domains. Additionally, the Alípio-Visacro (AV) model has produced intermediate responses, being the model recommended by CIGRÈ WG C4.33. Time-domain induced voltage waveforms obtained with the Portela (P) model has shown pronounced differences, especially at the peak values, for the high-resistive soil. This study demonstrates the importance of considering the FD soil models to assess the transient responses adequately, especially when OHTLs are on high-resistive soils.

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Section: Modeling Of Ohtlsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%