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Statistical study of overvoltages due to maneuvers in the EAT transmission lines considering the freqency dependence of the electrical parameters of the soil

Grant number: 21/06157-5
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): October 01, 2021
Field of knowledge:Engineering - Electrical Engineering - Power Systems
Principal Investigator:Jose Pissolato Filho
Grantee:Jaimis Sajid Leon Colqui
Host Institution: Faculdade de Engenharia Elétrica e de Computação (FEEC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated scholarship(s):23/11009-0 - Analysis of transient overvoltage performance in HV and EHV transmission lines considering the corona effect, pollution in the insulator string, and lines installed at high altitudes, BE.EP.PD


Overvoltages due to maneuvers are among the most severe transients that damage the electrical insulation of components in power systems, especially Extra-High Voltage systems (EHV). These overvoltages are generated due to the non-synchronized closing of the mechanical poles of the circuit breakers, which are characterized by high peaks of short duration. As the exact prediction of the closing times is uncertain, the problem requires a statistical treatment for the estimation of the switching (maneuver) surge voltages that are essential for the design of the electrical insulation of the components. Usually, the probability distribution of overvoltages due to maneuvers in power systems is computed considering the soil modeled by its constant electrical parameters. However, such studies have not yet been conducted for power systems located on real soils, whose electrical parameters (resistivity and permittivity) are variable with frequency due to the displacement currents in the ground, which is a significant factor especially in regions of high resistivity soil. In this context, it is expected that surge probability distributions will be modified when these factors are taken into account in the transient analysis. This project proposes to investigate the probability distributions of overvoltages due to switching operations in EHV lines located on high resistivity and frequency-dependent soils. This study is justified due to the fact that at these voltage levels, overvoltages due to switching are more important than overvoltages generated by lightning strikes. In addition, it is known that when the soil is modeled by its frequency-dependent electrical parameters, the overvoltages obtained have reduced peak values compared to those obtained for the soil with constant parameters. In this context, the cost of the insulator string can be reduced when a more realistic model is used. The study includes several sensitivity analyses to investigate the impact of different parameters of the power system on the overvoltages such as the line length, the nominal system voltage, the electrical line parameters, the inclusion of frequency-dependent soil electrical parameters, and the line topology. Furthermore, to carry out more realistic studies, the metallic structures and tower-footing grounding systems are computed by full-wave electromagnetic models and subsequently represented in the form of black-box type models. From the studies performed, it is expected to provide more accurate transmission line models for the simulations of statistical electromagnetic transient events adding new features to EMTP-type programs. (AU)

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Scientific publications (9)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
COLQUI, JAIMIS S. L.; DE ARAUJO, ANDERSON R. J.; KUROKAWA, SERGIO; PISSOLATO FILHO, JOSE. Optimization of Lumped Parameter Models to Mitigate Numerical Oscillations in the Transient Responses of Short Transmission Lines. ENERGIES, v. 14, n. 20, . (21/06157-5, 19/01396-1)
PASCOALATO, TAINA FERNANDA GARBELIM; DE ARAUJO, ANDERSON RICARDO JUSTO; LEON COLQUI, JAIMIS SAJID; KUROKAWA, SERGIO; PISSOLATO FILHO, JOSE. A Comparison of Frequency-Dependent Soil Models: Electromagnetic Transient Analysis of Overhead Transmission Lines Using Modal Decomposition. ENERGIES, v. 15, n. 5, p. 31-pg., . (21/06157-5, 20/10141-4, 19/01396-1)
LEON COLQUI, JAIMIS SAJID; TIMANA ERASO, LUIS CARLOS; CABALLERO, PABLO TORREZ; PISSOLATO FILHO, JOSE; KUROKAWA, SERGIO. mplementation of Modal Domain Transmission Line Models in the ATP Softwar. IEEE ACCESS, v. 10, p. 15924-15934, . (21/06157-5)
ROBLES BALESTERO, P. JUAN; LEON COLQUI, JAIMIS SAJID; KUROKAWA, SERGIO. Using the Exact Equivalent pi-Circuit of Transmission Lines for Electromagnetic Transient Simulations in the Time Domain. IEEE ACCESS, v. 10, p. 10-pg., . (21/06157-5)
LEON COLQUI, JAIMIS SAJID; TIMANA, LUIS; CABALLERO, PABLO TORREZ; PISSOLATO FILHO, JOSE; KUROKAWA, SERGIO. Implementation of an Alternative Frequency-Dependent Three-Phase Transmission Line Model Based on the Folded Line Equivalent Model in MatLab-Simulink. ENERGIES, v. 15, n. 24, p. 18-pg., . (21/06157-5)
COLQUI, JAIMIS S. L.; TIMANA, LUIS CARLOS; CABALLERO, PABLO TORREZ; KUROKAWA, SERGIO; PISSOLATO FILHO, JOSE. A modified implementation of the Folded Line Equivalent transmission line model in the Alternative Transient Program. Electric Power Systems Research, v. 211, p. 12-pg., . (21/06157-5)
LEON COLQUI, JAIMIS SAJID; RIBEIRO DE MOURA, RODOLFO ANTONIO; DE OLIVEIRA SCHROEDER, MARCO AURELIO; PISSOLATO FILHO, JOSE; KUROKAWA, SERGIO. The Impact of Transmission Line Modeling on Lightning Overvoltage. ENERGIES, v. 16, n. 3, p. 19-pg., . (21/06157-5)
MANZI DE AZEVEDO, WALTER LUIZ; JUSTO DE ARAUJO, ANDERSON RICARDO; LEON COLQUI, JAIMIS SAJID; ASLAN D'ANNIBALE, JOSE LUCIANO; PISSOLATO FILHO, JOSE. Alternative study to reduce backflashovers using tower-footing grounding with inclined rods. Electric Power Systems Research, v. 214, p. 15-pg., . (21/06157-5, 19/01396-1)
LEON COLQUI, JAIMIS SAJID; JUSTO DE ARAUJO, ANDERSON RICARDO; PASCOALATO, TAINA FERNANDA GARBELIM; KUROKAWA, SERGIO; PISSOLATO FILHO, JOSE. Transient Analysis on Multiphase Transmission Line Above Lossy Ground Combining Vector Fitting Technique in ATP Tool. IEEE ACCESS, v. 10, p. 11-pg., . (21/06157-5, 20/10141-4, 19/01396-1)

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