Behaviour of SF6 high-voltage circuit breakers with different arc-extinguishing systems at short-line fault switching

Knoblock, H.; Habedank, U.

doi:10.1049/ip-smt:20010586

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…It was shown previously that the arc resistance shortly before or at CZ can also serve as a good measure for the thermal interruption limit [30,31]. Shown in the left graph of Fig.…”

Section: Pre-cz Measurementsmentioning

confidence: 88%

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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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“…It was shown previously that the arc resistance shortly before or at CZ can also serve as a good measure for the thermal interruption limit [30,31]. Shown in the left graph of Fig.…”

Section: Pre-cz Measurementsmentioning

confidence: 88%

“…Several authors used pre-CZ measurements to determine the thermal interruption capability, as these are easy to obtain [28][29][30]. It was shown previously that the arc resistance shortly before or at CZ can also serve as a good measure for the thermal interruption limit [30,31]. Shown in the left graph of Fig.…”

Section: Pre-cz Measurementsmentioning

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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An improved method for fast evaluating arc quenching performance of a gas based on 1D arc decaying model

Zhong

Zheng

2019

Physics of Plasmas

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The evaluation of an arc quenching medium in circuit breakers usually requires the experimental investigation or the 2D or 3D magnetohydrodynamics simulation of switching arcs, which are expensive and time-consuming. In this work, a fast method is proposed for evaluating the arc quenching performance of gases. In this method, the arc decaying process is divided into three stages based on the results of 1D arc decaying modeling, including the thermal recovery stage, the predielectric recovery stage, and the postdielectric recovery stage. Compared to the previous method, the present method is improved mainly in the three aspects: the thermal recovery stage is featured by the average radial temperature instead of the axial temperature; the criterion of dividing the dielectric recovery stage into the pre- and postdielectric recovery stages is validated by the average electron number density instead of choosing arbitrarily; and the postdielectric recovery stage is characterized by the critical electric field strength Ecr instead of the reduced critical electric field strength (E/N)cr. The case study of SF6, CO2, CF4, and air arcs indicates that the present method yields the same descending order of the thermal recovery rate and the predielectric recovery rate for the four gases as the previous method. Moreover, the present method can avoid negative postdielectric recovery rates, which means that it is more reasonable than the previous method.

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Pressure and Arc Voltage Measurement in a 252 kV SF₆Puffer Circuit Breaker

Zhang¹,

Yujing²,

Zhang³

2016

Plasma Sci. Technol.

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The pressure distribution in an arcing chamber is critically important for the SF6 puffer circuit breaker design. In this paper, the pressure variation of four locations in the nozzle was measured by piezoresistive and fiber optical pressure sensors at two current levels of 10 kA and 50 kA. An arc voltage measurement was also taken. The results demonstrate that using either type of sensor with a connecting tube is able to detect the fast pressure variation in circuit breakers, however the possible distortion and delay to the pressure transient caused by the tube need further study.

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Behaviour of SF6 high-voltage circuit breakers with different arc-extinguishing systems at short-line fault switching

Cited by 7 publications

References 3 publications

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

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

An improved method for fast evaluating arc quenching performance of a gas based on 1D arc decaying model

Pressure and Arc Voltage Measurement in a 252 kV SF₆Puffer Circuit Breaker

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Behaviour of SF6 high-voltage circuit breakers with different arc-extinguishing systems at short-line fault switching

Cited by 7 publications

References 3 publications

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

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

An improved method for fast evaluating arc quenching performance of a gas based on 1D arc decaying model

Pressure and Arc Voltage Measurement in a 252 kV SF6Puffer Circuit Breaker

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Product

Resources

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Pressure and Arc Voltage Measurement in a 252 kV SF₆Puffer Circuit Breaker