ARC resistance at current zero: a tool to describe the breaking capacity of SF

Knobloch, H.; Habedank, U.

doi:10.1049/cp:19990735

Cited by 3 publications

(2 citation statements)

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“…The resistance of the arc shortly before current zero crossing is often used as an indicator for the thermal interruption performance of GCB [30]. The corresponding values for the interruption tests with the SI are depicted in Fig.…”

Section: Interruption Capabilitymentioning

confidence: 99%

Improving interruption performance of mechanical circuit breakers by controlling pre‐current‐zero wave shape

et al. 2019

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Mechanical circuit breakers (MCBs) are the limiting component for current injection HVDC circuit breakers. Improving their interruption performance reduces requirements for capacitance and inductance needed in the injection circuit and thus space use and costs. Higher performance can be achieved by creating a period of low current gradient before zero crossing in the MCB, e.g. by using a saturable inductor (SI). In this paper, the impact of duration and steepness during the low currentgradient phase is linked to arc parameters of the investigated model gas circuit breaker. It is shown in a scaled experimental setup that an optimum design of the SI can be derived from arc time constant and interruption limits for constant current gradients. This optimisation results in a considerable increase of interruption performance. The feasibility of implementing an SI in a full-scale HVDC circuit breaker is demonstrated using simulations. Using an improved injection scheme, the stresses for the MCB can be reduced significantly. Consequently, the injection circuit components can be scaled down, making the topology more economical. The reduced interruption requirements might also make it possible to use a single gas interrupter instead of a series connection of vacuum interrupters, reducing the complexity of the mechanical switch.

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Section: Interruption Capabilitymentioning

confidence: 99%

Improving interruption performance of mechanical circuit breakers by controlling pre‐current‐zero wave shape

et al. 2019

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“…Around a natural CZ, a hot and axially stabilized plasma channel is left. Interruption occurs typically if this hot plasma channel has a sufficiently high resistance [10] to avoid reheating of the plasma channel which would lead to re-ignition of the arc. After current interruption, a sufficiently low electrical field has to be ensured in the gap and on the contacts, to avoid dielectric breakdown of the gap.…”

Section: Introductionmentioning

confidence: 99%

Application of High Current and Current Zero Simulations of High‐Voltage Circuit Breakers

Franck

Seeger

2006

Contrib. Plasma Phys.

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This paper reports on the use of computational fluid dynamic (CFD) simulations to predict the interruption behaviour of high-voltage circuit breakers (HV-CB) using the self-blast principle. Two different levels of accuracy of the arc model are proven to be sufficiently accurate for simulating the high-current phase and the period around current zero (CZ). For the high-current phase, a simplified equivalent model of the arc is implemented to predict the pressure build-up, and even more important to accurately trace the hot gas from the arcing zone into the exhausts and the heating volume. A detailed analysis of the gas mixing in the heating volume for different arcing times and current amplitudes showed the optimum geometrical design of the heating volume. For the CZ phase, a more detailed arc model is needed including the effects of ohmic heating, radiative energy transfer, and turbulent cooling fully resolved in space and time. The validation with experiments was done and shows good agreement which justifies the use of the implemented model. With it, scaling laws varying only one parameter at a time (pressure and applied current slope) were derived and confirm previously found empirical laws. This is of particular interest, as it is very difficult to derive such scaling laws from experiments where the scatter is always very large and where it is impossible to vary only one parameter at a time. The influence of the most important geometrical parameters of the nozzle on the interruption performance is shown. In addition to previous experimental indications of this, the simulation reveals that turbulent cooling on the arc edge is the main reason for the difference in interruption performance. Moreover, the exact spatio-temporal build-up of arc resistance and with it the detailed understanding of the arc interruption process is possible and shown here for the first time. These simulations enable us to predict HV-CB performance and to minimise the number of development tests and are routinely used in new development projects.

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Exploração da influência dos parâmetros no arco secundário durante manobras de religamento monopolar

Sandmann,

Schutz

et al. 2024

R. G. Secr.

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No contexto dos sistemas elétricos, as linhas de transmissão (LTs) são particularmente vulneráveis a falhas, que podem ser causadas por eventos como descargas atmosféricas, ventos fortes e queimadas. Durante essas falhas, a presença de altas correntes e a ionização dos gases podem levar à formação de um arco elétrico. As manobras de religamento têm um papel crucial na extinção rápida e eficaz desses arcos. Contudo, para garantir a eficácia dessas manobras, é fundamental entender as características e os fatores envolvidos na formação, sustentação e extinção do arco elétrico. Este trabalho foca na análise do comportamento do arco elétrico em sistemas de potência durante manobras de religamento monopolar. O estudo explora a influência e o comportamento dos parâmetros do arco secundário, incluindo corrente, tensão, condutividade estacionária e instantânea, resistência, comprimento e velocidade de crescimento. Para alcançar os objetivos propostos, foi implementado um modelo de arco elétrico, amplamente reconhecido na literatura, utilizando a linguagem de programação MODELS do ATP (Alternative Transients Program). O arco foi modelado como uma resistência variável conectada ao ponto central de uma linha de transmissão de 400 km, com uma tensão de 500 kV e sem compensação.

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ARC resistance at current zero: a tool to describe the breaking capacity of SF

Cited by 3 publications

References 0 publications

Improving interruption performance of mechanical circuit breakers by controlling pre‐current‐zero wave shape

Improving interruption performance of mechanical circuit breakers by controlling pre‐current‐zero wave shape

Application of High Current and Current Zero Simulations of High‐Voltage Circuit Breakers

Exploração da influência dos parâmetros no arco secundário durante manobras de religamento monopolar

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