Wide-Band Modeling of Tower-Footing Grounding Systems for the Evaluation of Lightning Performance of Transmission Lines

Alemi, Mohamad Reza; Sheshyekani, Keyhan

doi:10.1109/temc.2015.2453512

Cited by 39 publications

(20 citation statements)

References 30 publications

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“…The wide-band modeling refers to CP-wide-band (CP model) where the soil electrical parameters are assumed to be constant or FD-wide-band (FD model) where the soil electrical parameters are assumed to be frequency dependent as suggested by Longmire model. Further detail on wide-band modeling of tower footing grounding system can be found in [9]. It must be mentioned that in the current work the soil ionization is disregarded.…”

Section: Tower Footing Impedancementioning

confidence: 99%

Section: Modelling Of Grounding Systemmentioning

confidence: 99%

“…The reader is referred to [9] for further details. Following the procedure of [9], the state space model of the grounding system admittance matrix is developed for the time domain simulation in EMTP.RV. The overall procedure involves rational fitting of the admittance matrix and then constitution of the state-space model in the form of (4) where x(t) is the state vector while v(t) and i(t) hold the voltage and current vectors of each port of the grounding system (see [22] for further details).…”

Section: Modelling Of Grounding Systemmentioning

confidence: 99%

“…The overall procedure involves rational fitting of the admittance matrix and then constitution of the state-space model in the form of (4) where x(t) is the state vector while v(t) and i(t) hold the voltage and current vectors of each port of the grounding system (see [22] for further details). It must be mentioned that the state-space equations can be implemented in EMTP_RV, directly [9].…”

Section: Modelling Of Grounding Systemmentioning

confidence: 99%

“…In the previous works the grounding system has been modeled with a linear or nonlinear resistor [2][3][4][5]. However, a method has also been presented in [8][9][10] for wide band modelling of grounding systems in the EMTP-like tools. This helps with the accurate calculation of lightning overvoltages.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Probabilistic Assessment of Lightning Related Risk of Transmission Lines Based on Frequency Dependent Modeling of Tower-Footing Grounding System

Gholinejhad¹,

Shariatinasab²,

Sheshyekani³

2018

AEM

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This paper presents a probabilistic evaluation, based on Monte-Carlo method, for the estimation of insulation risk of failure of overhead transmission lines (TLs). The proposed method takes into account the wide-band model of towerfooting grounding system. The wide-band model of grounding system in frequency domain is obtained by the method of moment solution to the governing electrical field integral equations. The electrical parameters of soil are considered to be either constant or frequency dependent. The time-domain representation of the grounding system is inferred through pole-zero characterization of its associated frequency response. The case of a typical 400-kV transmission line is modelled in EMTP_RV with the towerfooting grounding system integrated with the transmission line (TL) system. The results of the paper show that the failure risk of transmission lines is affected by the grounding system model. This effect is more pronounced when the soil electrical parameters are assumed to be frequency dependent.

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Section: Tower Footing Impedancementioning

confidence: 99%

Section: Modelling Of Grounding Systemmentioning

confidence: 99%