On Short-Circuit Current Calculations Including Superconducting Fault Current Limiters (ScFCLs)

Castro, Luis M.; Guillén, Daniel; Trillaud, F.

doi:10.1109/tpwrd.2018.2800732

Cited by 22 publications

(13 citation statements)

References 19 publications

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“…For instance, the damage in substation equipment aforementioned also causes financial losses to the utilities. However, instead of replacing all installed equipment, a proper solution is the use of a Fault Current Limiter (FCL) in the system 6‐9 …”

Section: Introductionmentioning

confidence: 99%

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Design and tests of solid‐state fault current limiters prototypes

Bitencourt

Dias

França

et al. 2020

Int Trans Electr Energ Syst

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Summary The fault current level in distribution systems has increased in the last years mainly due to the energy consumption is in the limit of the production capacity and also the insertion of distributed generation, since the short circuits happen very closer to the generators now. In addition to this, most of the power substations were designed decades ago, so their equipment is overcome, and they may be damaged in a fault occurrence. To effectively protect the settled equipment or to avoid high investment costs in replacing them, one possible solution is to install a solid‐state fault current limiter (SSFCL), which may reduce the fault current to a value under the supported level. In this context, this work proposes the development of two kinds of SSFCLs: series‐switched reactor and resonant circuit. These devices were designed and compared experimentally in bench prototypes. The measurements showed that both topologies could reduce the fault current from 600 APEAK to 75 APEAK. Both SSFCL‐tested configurations were implemented using silicon controlled rectifier or insulated gate bipolar transistor. The results present the comparison between them, showing the impact in the first semi‐cycle current profile, depending on the type of semiconductor switch adopted. This article also proposes a fault detection algorithm evaluated through digital implementation in a microcontroller. The algorithm detects the fault by the instantaneous current value and its derivative, using a control strategy that avoids false detection due to measurement noises. The theoretical analysis and results are useful contributions to support the SSFCL topology choice regarding its application.

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Section: Introductionmentioning

confidence: 99%

“…Usually, an FCL is installed in series with the electrical network to reduce the fault current. There are several technologies of FCL, and the best one must be chosen based on technical and economic criteria 8 . Some characteristics that must be taken into account are:…”

Section: Introductionmentioning

confidence: 99%

Design and tests of solid‐state fault current limiters prototypes

Bitencourt

Dias

França

et al. 2020

Int Trans Electr Energ Syst

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“…Considerando também os índices de qualidade de energia, como DEC (Duração Equivalente de Interrupção por Unidade Consumidora) e FEC (Frequência Equivalente de Interrupção por Unidade Consumidora), e o deslocamento de equipe para religamento do circuito, é mais vantajoso, no ponto de vista da distribuidora a limitação da corrente de falta. Existem diversas tecnologias de LCCCs e a escolha do melhor tipo de limitador de corrente de curto-circuito a ser instalado em um determinado sistema deve ser baseada em critérios técnicos e econômicos [8].…”

Section: Introductionunclassified

Análise Técnica e Operacional de Limitadores de Correntes de Curto-Circuito

Bitencourt¹,

Koji²,

Scofano³

et al. 2020

Eletrônica de Potência

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Resumo -O aumento da demanda de energia elétrica e o crescimento da geração distribuída levam ao aumento da corrente de curto-circuito nas subestações. A maioria das subestações brasileiras, por exemplo, foram projetada décadas atrás, portanto seus equipamentos podem não suportar os novos níveis de corrente de curtocircuito. Para proteger os equipamentos instalados ou evitar altos custos de investimento na sua substituição destes, é possível instalar limitadores de corrente de curto-circuito. Este trabalho apresenta uma avaliação de duas topologias de limitadores através de análises dos aspectos técnicos e operacionais. Protótipos de pequena escala são empregados para entender melhor essas análises. As topologias estudadas são denominadas indutor série chaveado e circuito ressonante. A corrente de curto-circuito teve uma redução para a topologia indutor série chaveado de 69,7% e 72,6% para a topologia ressonante.Abstract -The increase in demand for electric power and the growing of distributed generation led to the increase of the short-circuit current in the substations. Most of these Brazilian substations, for example, were designed decades ago, so their equipment may not support the new short-circuit current levels. To protect the installed equipment or to avoid high investment costs in replacing them, it is possible to install fault current limiters. This work provides technical evaluation of two known topologies of fault current limiters through theoretical analyses of technical and operational aspects. Small-scale prototypes are employed to get a better understanding of those analyses. The studied topologies are called series switched-inductor and resonant circuit. The short-circuit current had a reduction for the switched-inductor topology of 69.7% and 72.6% for the resonant topology.

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“…In addition to current sensors, several current prediction techniques were proposed in [18][19][20][21]. Although they are effective in motor and grid control, they cannot be applied in MCBs due to different structural characteristics and calculation premises.…”

Section: Introductionmentioning

confidence: 99%

An electrothermal current prediction method for overload protection of miniature circuit breakers

Lyu¹,

Zong²

2020

Turk J Elec Eng & Comp Sci

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Traditional miniature circuit breakers (MCBs) cannot meet the requirement for the intelligence of distributing apparatuses in a smart grid. The intellectualization of MCBs is restricted due to the lack of appropriate current measurement methods. Thus, an electrothermal current prediction method is proposed based on the derived relationship between root-mean-square (RMS) current and steady-state temperature rise. A fast acquisition algorithm is used to obtain the required temperature rise before thermal equilibrium to highly reduce the total time consumption. The presented prediction method is found immunized against the ambient temperature. The theory is validated with experiments using a thermostat. The tested steady-state accuracy and transient performance could meet the overload protection requirements without being affected by the environmental temperature.

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On Short-Circuit Current Calculations Including Superconducting Fault Current Limiters (ScFCLs)

Cited by 22 publications

References 19 publications

Design and tests of solid‐state fault current limiters prototypes

Design and tests of solid‐state fault current limiters prototypes

Análise Técnica e Operacional de Limitadores de Correntes de Curto-Circuito

An electrothermal current prediction method for overload protection of miniature circuit breakers

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