Short Circuit Currents

Schlabbach, Jürgen

doi:10.1049/pbpo051e

Cited by 34 publications

(30 citation statements)

References 3 publications

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“…Faults can occur due to external factors such as lightning strokes that lead to voltage surges, accumulation of moisture and contaminants mainly in humid environments, damage of cables due to earth construction works, etc. Internal factors can also result in faults such as these attributed to the deterioration of insulation material due to ageing, overheated equipments as a result of loose connections, voltage or mechanical stresses applied to system equipments, systemgenerated voltage surges due to switching, and connection/disconnection of loads and equipments, [1][2].…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study of Ground Fault Analysis for a Practical Case of a Transmission Line Equipped with Different Series FACTS Devices

et al. 2015

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Original scientific paperDue to the rising power demand and increasing population worldwide, electrical power networks have been extensively growing and striving to satisfy the escalating loads. This necessitates the need for using Flexible AC Transmission System (FACTS) devices which have become indispensable during normal and abnormal operating conditions. This paper investigates the impact of using series FACTS devices, namely Thyristor Controlled Series Capacitor (TCSC), GTO Controlled Series Capacitor (GCSC) and Thyristor Controlled Series Reactor (TCSR), on the impedance and power flow of a practical 400 kV transmission line in the Algerian power network. It also investigates the effect of varying the fault resistance on short-circuit calculations in the case of a phase to ground fault that occurs at the end of the compensated line. Analytical formulas of the employed FACTS devices, the system model under fault and short-circuit calculations are deduced and presented in the paper. Simulations results obtained using MATLAB are demonstrated for the compensated line and without compensation. These simulations are compared to show the effect of using these devices for the studied cases.It is concluded that GCSC provides better performance in the active and reactive power flow of the line under normal operating conditions and in reducing the fault current during abnormal operating conditions when the fault resistance increases. On the other hand, TCSR shows a better performance in maintaining higher voltages under fault with the increase of fault resistance.Key words: Thyristor Controlled Series Capacitor (TCSC), GTO Controlled Series Capacitor (GCSC), Thyristor Controlled Series Reactor (TCSR), Algerian power network, Phase to ground fault, Fault resistance, Short-circuit calculations.Usporedna analiza greške uzemljenja za praktični slučaj transmisijske linije s različitim FACTS uređajima. Zbog rastuće potražnje za električnom energijom i porasta svjetske populacije elektroenergetske mreže ubrzano rastu i podnose sve veće terete. Takav razvoj situacije doveo je do korištenja fleksibilnih AC transmisijskih sustava (FACTS) koji su postali nezamjenjivi tijekom normalnih i narušenih uvjeta na mreži. U ovom se radu istražuje utjecaj korištenja FACTS uređaja, tiristorski upravljani serijski kondenzatori, GTO upravljani serijski kondenzatori i tiristorski upravljana serijska reaktancija, na impedanciju i tok snage kod 400 kV transmisijske lijene u alžirskom elektroenergetskom sustavu. Istražuje se i utjecaj promjene otpora greške pri izračunu kratkog spoja u slučaju spoja faze na zemlju koje se događa na krajevima linije. Analitičke formule korištenog FACTS uređaja, model sustava s greškom i izračun kratkog spoja su izvedeni i prikazani u radu. Simulacijski rezultati dobiveni korištenjem MATLB-a prikazani su za linije sa i bez kompenzacije. Simulacije su uspoređene kako bi se prikazao učinak korištenja različitih uređaja. Zaključeno je da GTO upravljani serijski kondenzatori ima bolja svojstva kod toka radne i jalove...

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Section: Introductionmentioning

confidence: 99%

“…Short circuit fault analysis determines the make and break fault levels in the system for all types of faults which allows the proper determination of equipments' ratings, settings and coordination, [1].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Ground Fault Analysis for a Practical Case of a Transmission Line Equipped with Different Series FACTS Devices

et al. 2015

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“…A referência (Schlabbach, 2005) define o fator de falta à terra (δ) que é a relação entre a maior tensão de fase das fases sãs em relação à tensão de fase nominal do sistema após um curto-circuito monofásico. Esta é uma medida da sobretensão causada nas fases sãs devido à uma falta fase-terra.…”

Section: Figura 33 -Relação Entre As Magnitudes Das Correntes De Curunclassified

“…A referência (Schlabbach, 2005) define o valor δ = 1,4 como um limite que classifica os aterramentos em "baixa impedância" e "elevada impedância". Por sua vez, a norma americana IEEE 100 estabelece um sistema como efetivamente aterrado se no ponto de falta valer as relações: X 0 /X 1 ≤ 3 e R 0 /X 1 ≤ 1 (Blackburn, 2006).…”

Section: Figura 33 -Relação Entre As Magnitudes Das Correntes De Curunclassified

“…No caso de falta longe do gerador, a corrente simétrica de interrupção de curto-circuito (I b ) é igual à corrente simétrica inicial de curto-circuito (I˝k), pois a componente alternada não decai (Schlabbach, 2005), i.e., μ = 1. Este é o caso geral das redes de distribuição, e por esta razão, considerou-se a corrente simétrica inicial (I˝k) como o parâmetro a ser estudado neste trabalho.…”

Section: İ˝k İ˝k Dgunclassified

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Uma abordagem paramétrica do impacto da geração distribuída sobre as correntes de curto-circuito e na proteção de redes de distribuição.

Salgado¹

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Este exemplar foi revisado e corrigido em relação à versão original, sob responsabilidade única do autor e com a anuência de seu orientador. Para se calcular as correntes de curto-circuito, desenvolveu-se uma planilha eletrônica cujos resultados foram validados com programas comerciais de análise de redes elétricas. Esta ferramenta foi utilizada para demonstrar, através de exemplos, o impacto causado pela geração distribuída sobre as correntes de curto-circuito e, posteriormente, para realizar as análises paramétricas nas quais a influência de cada variável foi avaliada.A aplicação do método paramétrico permitiu o estudo de possíveis limites para a potência de um gerador distribuído em função dos impactos admissíveis, de seu ponto de conexão, de seus parâmetros elétricos e dos parâmetros elétricos da rede.Palavras-chave: Geração distribuída de energia elétrica. Distribuição de energia elétrica.Correntes de curto-circuito. Análise paramétrica. V ABSTRACTThe purpose of this thesis is to analyse the impacts of distributed generation on shortcircuit currents and protection of the distribution utilities medium voltage networks using a parametric approach.The new regulations that are promoting the distributed generation in Brazil are the main motivation for this work. However, the conventional distribution networks were designed to

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A validation approach for short‐circuit currents calculation in large‐scale power systems

Suvorov

Gusev

Andreev

et al. 2020

Int Trans Electr Energ Syst

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Summary Reliability and efficiency of electric power systems (EPS) operation depend on the adequacy of information about quasi‐state and transient processes in EPS used for their research, design, and operation. A value of short‐circuit currents (SCC), especially their maximum values, is one of the important information used for different tasks. The difficulty of obtaining this information is the need to use a large‐scale EPS mathematical model for SCC calculation. The total mathematical model of any large‐scale EPS is a stiff and nonlinear system of differential equations of high order. Such system cannot be solved analytically. Satisfactory solution is also impossible by using the numerical approach that leads to the need for applying simplifications and limitations reducing the adequacy of simulation results. Therefore, each solution should be validated. The comparison of simulation results with the field data is the most reliable way of validation. However, the acceptable amount of field data cannot be obtained in the foreseeable future in view of the obvious variety of EPS modes, especially emergency ones. An alternative way of validation is suggested in the paper: the using of an adequate reference model instead of field data. The experimental sample of hybrid real‐time power system simulator having the necessary properties and capabilities is used as the reference model. The indicated possibility of SCC calculation validation is proved by the experimental studies shown in the paper.

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Short Circuit Currents

Cited by 34 publications

References 3 publications

A Comparative Study of Ground Fault Analysis for a Practical Case of a Transmission Line Equipped with Different Series FACTS Devices

A Comparative Study of Ground Fault Analysis for a Practical Case of a Transmission Line Equipped with Different Series FACTS Devices

Uma abordagem paramétrica do impacto da geração distribuída sobre as correntes de curto-circuito e na proteção de redes de distribuição.

A validation approach for short‐circuit currents calculation in large‐scale power systems

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