Simulation of gas flow phenomena in high-voltage self-blast circuit breakers at heavy fault current interruption

Claessens, M.; Starck, R. von; Thiel, H.G.

doi:10.1109/27.649618

Cited by 19 publications

(7 citation statements)

References 6 publications

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“…For simulation of the flow and temperature distribution in the arc region, a commercial solver (CFX4) using the finite volume method was used. Details of the method are described in [28,29]. The electrical field was calculated from the distribution of the electrical conductivity.…”

Section: Simulation Resultsmentioning

confidence: 99%

Investigation of the dielectric recovery in synthetic air in a high voltage circuit breaker

Seeger¹,

Naidis²,

Steffens³

et al. 2005

J. Phys. D: Appl. Phys.

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The dielectric recovery of an axially blown arc in an experimental set-up based on a conventional HV circuit breaker was investigated both experimentally and theoretically. As a quenching gas, synthetic air was used. The investigated time range was from 10 µs to 10 ms after current zero (CZ). A fast rise in the dielectric strength during the first 100 µs, followed by a plateau and further rise later was observed. The dependences on the breaking current and pressure were determined. The measured dielectric recovery during the first 100 µs after CZ could be reproduced with good accuracy by computational fluid dynamics simulations. From that it could be deduced that the temperature decay in the axis does not depend sensitively on the pressure. The dielectric recovery during the first 100 µs scales therefore mainly with the filling pressure. The plateau in the breakdown characteristic is due to a hot vapour layer from the still evaporating PTFE nozzle surface.

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Section: Simulation Resultsmentioning

confidence: 99%

Investigation of the dielectric recovery in synthetic air in a high voltage circuit breaker

Seeger¹,

Naidis²,

Steffens³

et al. 2005

J. Phys. D: Appl. Phys.

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“…In the sense of this paper a high current means values above about 10 kA. Under this condition the arc becomes ablationand radiation-dominated and an integral arc model can be applied for cylindrically shaped nozzles [3][4][5]; the very costly calculation of electric, magnetic and radiation fields can be omitted. An important task is the implementation of the integral arc model into the CFD code.…”

Section: The Methods Of Calculationmentioning

confidence: 99%

“…To describe an ablation-controlled high-current arc in a cylindrically shaped nozzle the two-zone model, which divides the nozzle cross section into a hot, conducting and cylindrically shaped plasma zone surrounded by a non-conductive PTFE-vapour layer, has been established [3][4][5]. This type of discharge develops when an arc is quenched into a long and narrow, cylindrically shaped nozzle consisting of insulating material.…”

Section: The Two-zone Model For the Ablation-controlled Arcmentioning

confidence: 99%

A computational fluid dynamics simulation of high- and low-current arcs in self-blast circuit breakers

Claessens

Möller

Thiel³

1997

J. Phys. D: Appl. Phys.

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Computational fluid dynamics calculations for high- and low-current arcs in an interrupter of the self-blast type have been performed. The mixing process of the hot PTFE cloud with the cold in the pressure chamber is strongly inhomogeneous. The existence of two different species has been taken into account by interpolation of the material functions according to their mass fraction in each grid cell. Depending on the arcing time, fault current and interrupter geometry, blow temperatures of up to 2000 K have been found. The simulation results for a decaying arc immediately before current zero yield a significantly reduced arc cooling at the stagnation point for high blow temperatures.

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“…The average ablation rate is 16.5 mg/kJ for switch 1 and 24.9 mg/kJ for switch 2. For reference, 17 mg/kJ is the rate given for gray PTFE in [17].…”

Section: Ablation Rate and Nozzle Degradationmentioning

confidence: 99%

Self-Blast Current Interruption and Adaption to Medium-Voltage Load Current Switching

Taxt

Niayesh

Runde

2019

IEEE Trans. Power Delivery

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Abstract-Ablation-assisted current interruption is a candidate for improving interruption capability in medium voltage switchgear. In high voltage switchgear, ablation is utilized to achieve high pressures in self-blast circuit breakers. Self-blast switch technology adapted to medium voltage could represent an attractive alternative to SF6 technology in load current interruption. However, the arc energies involved would be much lower than in fault current interruption, where self-blast technology is traditionally employed, and to achieve sufficient pressure buildup, this must be compensated for. Higher pressure could be achieved by reducing the radius or increasing the length of the nozzle throat, reducing the heating volume size, changing or increasing the amount of ablative material, or restricting the outward gas flow. Interruption experiments in air have been performed on four different model switch designs that are meant to highlight the possibilities and challenges of adapting self-blast technology to medium voltage load current interruption. The results show that typical load currents can be interrupted at 24 kV, but below a certain critical current, in the present case 200 A, interruptions fail. Self-blast technology could prove useful in medium voltage load current interruption in the future, provided a method for interrupting the lowest currents can be found.

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Simulation of gas flow phenomena in high-voltage self-blast circuit breakers at heavy fault current interruption

Cited by 19 publications

References 6 publications

Investigation of the dielectric recovery in synthetic air in a high voltage circuit breaker

Investigation of the dielectric recovery in synthetic air in a high voltage circuit breaker

A computational fluid dynamics simulation of high- and low-current arcs in self-blast circuit breakers

Self-Blast Current Interruption and Adaption to Medium-Voltage Load Current Switching

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