Measurements and Simulations of Cold Gas Flows in High Voltage Gas Circuit Breakers Geometries

Mantilla, Javier; Franck, Christian M.; Seeger, Martin

doi:10.1109/elinsl.2008.4570431

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…Therefore, the Reynolds-averaged Navier-Stokes (RANS) equations, which express the conservation of mass, momentum and energy for turbulent flows, are used as governing equations [9]. Furthermore, the k-ε turbulent model was used to simulate the turbulent effect as it has shown reasonable performance for circuit breaker simulation [12]. Given that the maximum temperature in this simulation is below 1000 K, ideal gas law was used to calculate temperature dependent properties.…”

Section: Supersonic Flowmentioning

confidence: 99%

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Effect of Gas Type on Flow Characteristics in a Circuit Breaker under Cold Flow Scenario

Qiao,

Matharage,

Wang

2023

PPT

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This paper presents first stage of supersonic flow modelling in gas circuit breakers without an arc. Flow characterisation focused on shock and flow separation phenomenon. Velocity deceleration caused by shock will play a significant role in determining arc cooling performance and will impact thermal interruption capability. Gas properties such as specific heat ratio, density, and viscosity influenced the flow characteristics including shock location, strength and the flow separation process.

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Section: Supersonic Flowmentioning

confidence: 99%

“…The effects of inlet pressure, contacts opening and gas type on the flow structure were studied. Table 1 shows the simulation conditions which were derived from experiments in [12].…”

Section: Simulation Conditionsmentioning

confidence: 99%

Effect of Gas Type on Flow Characteristics in a Circuit Breaker under Cold Flow Scenario

Qiao,

Matharage,

Wang

2023

PPT

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“…[8]. For the measurements, three pressure sensors are installed, two along the fixed wall in the diffuser region and one on the plug; see Fig.…”

Section: Validation Study Ii: Transonic Diffuser Flow With the Prmentioning

confidence: 99%

Verification and validation studies of OpenFOAM for transonic compressible flow simulations inside high voltage circuit breaker diffusers

Wüthrich

Lee

2008

Conference Record of the 2008 IEEE International Symposium on Electrical Insulation

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Accurate compressible flow simulations are known to improve the prediction quality of breakdown voltages in various test duties of high voltage circuit breakers. In this paper, we systematically investigate the solver quality of the open source CFD code OpenFOAM in handling transonic flow phenomena that typically occur inside the breaking chamber of high voltage circuit breakers, during contact separation. The solver quality is then compared with that of chosen commercial CFD tools. The main advantage of OpenFOAM is that, contrary to most of the commercial simulation tools, it is license fee free and allows access to the source code. This means that complicated multiphysics phenomena inside the arcing chamber can be directly modelled into the code by users, which opens an opportunity to remove limitations of commercial CFD tools.This paper consists of a number of verification and validation studies. Particularly, the shock capturing capability of OpenFOAM will be evaluated for the transonic internal flow which typically occurs in high voltage circuit breakers. The solver quality of OpenFOAM will then be compared with a number of benchmark commercial CFD tools. Overall, Open-FOAM shows acceptable shock capturing capabilities in the performed verification and validation studies, with the solver quality comparable to some of the tested commercial CFD tools. There is still room for further solver quality improvements in OpenFOAM by implementing better shock capturing schemes such as a density-based flux-difference-splitting scheme or by writing better physical modelling of the shock/boundary layer interaction into the open architecture of OpenFOAM.Considering the unlimited extensibility of the open architecture and the already proven CFD solver quality, a large part of the high voltage circuit breaker development activities can be benefited by introducing an OpenFOAM-based simulation technology.

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“…In particular, CCS requires a high gas density inside the insulation nozzle that covers the driven-side contact and a low electric field between the contacts. To increase the gas density between contacts, the density drop inside the nozzle due to flow acceleration caused by the supersonic flow should be suppressed [5][6][7][8][9][10][11]. To decrease the electric field between the contacts, their separation in the period of the half-cycle from contact separation has to be increased; that is, the contacts must move at a fast speed.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Dual Motion Mechanism with Double Grooved Cams for High-voltage Gas Circuit Breaker

Terada¹

2020

Adv. sci. technol. eng. syst. j.

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A novel design of a dual motion mechanism for a high-voltage gas circuit breaker is presented. The contact motion of the circuit breaker due to the operating mechanism increases capacitive current switching (CCS) performance. CCS is one of the interrupting duties of the circuit breaker, where high voltage is applied during the half cycle from contact separation. The dual motion mechanism drives two contacts in opposite directions from each other. Operating energy is reduced because the maximum displacement of the moving parts linked to the operating mechanism is shortened. To increase CCS performance at lower operating energies, the contact on the opposite side of the contact linked to the operating mechanism requires quick motion in the CCS period with a short displacement. The dual motion mechanism reported here is composed of two grooved cams that cross each other (double grooved cams). A pin positioned at the intersection point of the grooved cams rotates a lever linked to both contacts while changing the lever ratio that shortens the path length of the pin movement. To implement an optimized displacement curve with low operating energy and low mechanical stress while keeping the CCS performance high, a shape optimization method was developed that uses a direct search to minimize the local contact forces acting on the contact positions between the grooved cams and the pin. In order to maintain the stability of the pin in motion, a position holding part was designed by considering size of the gaps between the grooved cams and the pin. The measured displacement curve was in good agreement with the ideal one. In addition, a fullscale prototype was fabricated that successfully passed a 10,000-motion test.

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Measurements and Simulations of Cold Gas Flows in High Voltage Gas Circuit Breakers Geometries

Cited by 9 publications

References 1 publication

Effect of Gas Type on Flow Characteristics in a Circuit Breaker under Cold Flow Scenario

Effect of Gas Type on Flow Characteristics in a Circuit Breaker under Cold Flow Scenario

Verification and validation studies of OpenFOAM for transonic compressible flow simulations inside high voltage circuit breaker diffusers

Optimization of Dual Motion Mechanism with Double Grooved Cams for High-voltage Gas Circuit Breaker

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