Analytical Prediction of Transient Breakdown Characteristics of SF6 Gas Circuit Breakers

Endo, Fumio; Sato, Masaru; Tsukushi, Masanori; Yoshioka, Yoshio; Saito, Keiji; Hirasawa, K.

doi:10.1109/mper.1989.4310811

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…is the distance between the centers of the fixed pin and the driven pin. From Equation (19), the dimension ℎ is determined to be a range such that is less than .…”

Section: Methods Of Structural Design Of Double Grooved Camsmentioning

confidence: 99%

“…The contact forces acting on the contact positions between the grooved cams and the drive pin are sufficiently small. Figure 16 shows the relationship between the diameter of the pin position holding part and the drive-pin inclination expressed by Equation (19). As the threshold of the drive-pin inclination t  is 0.0033 due to the fit tolerances of the fixed pin and the driven pin, the diameter of the position holding part is 0.157, i.e., 1.96 times larger than the drive pin.…”

Section: Design Example Of Double Grooved Camsmentioning

confidence: 99%

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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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“…is the distance between the centers of the fixed pin and the driven pin. From Equation (19), the dimension ℎ is determined to be a range such that is less than .…”

Section: Methods Of Structural Design Of Double Grooved Camsmentioning

confidence: 99%

Section: Design Example Of Double Grooved Camsmentioning

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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“…The solution of these equations of conservation in a time accurate manner has already shown some utility in the prediction of the cold flow field, based on the Euler compressible flow model [6,71. This kind of investigation has permitted a prediction of the transient dielectric breakdown voltage in cold flow situations and also has shown to be an accurate method to estimate the pressure increase in the compression chamber.…”

Section: The Circuit-breaker Modelmentioning

confidence: 99%

Application of computational fluid dynamics tools to circuit-breaker flow analysis

Trépanier

Zhang

Pellegrin

et al. 1995

IEEE Trans. Power Delivery

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This paper presents the results of the application of a computational fluid dynamics computer program to the simulation of cold and plasma flows in circuit-breakers. The underlying physical model is based on the axisymmetric form of the conservation equations which are coupled with an arc model including ohmic heating and radiative exchanges of energy in the fluid. Various cases are computed, ranging from steady cold flow to unsteady arc-flow interaction. A good agreement has been found between the computed solutions and the available experimental data, demonstrating a great potential of these tools for circuit-breaker design and analysis in the future.

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“…Numerical methods for calculating cold flows in gas circuit breakers have been widely studied with CFD technology [1]- [7]. A few investigations have been focused on applying the CFD technology to the research of capacitive current switching [8]- [12]. In this research, with a model of a typical self-blast circuit breaker, a numerical simulation is implemented on a CFD platform to study the development of shock waves under the capacitive current switching.…”

Section: Introductionmentioning

confidence: 99%

Study of Shock Wave Development in Cold Flow of Gas Circuit Breaker for Improving Capacitive Current Switching

Gu¹,

Tian²,

Guo³

et al. 2021

B&H Electrical Engineering

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Capacitive current switching performance of SF6 circuit breaker is determined by combined action of gas flow and electric field in interruption chamber. Computational fluid dynamics method is used to study the development of shock waves inside a SF6 circuit breaker under the condition of capacitive current switching. It was found that a shock wave exists and travels with the pin contact during the contact opening. Existence of shock waves reduces the local gas density around contact head, while the contact head is also stressed by high electric field at the same time. If the region of low gas density coincides with the region with high electric strength, local dielectric performance will be significantly reduced. Using E/ρ as the dielectric performance index, when the local value of E/ρ exceeds the gas breakdown criterion, it will result in restrike to the capacitive current switching. The causes of high E/ρ are studied by analyzing the shock waves during the sequential periods of contact travel. Since the gap between the pin contact and nozzle throat strongly affects the strength of shock wave, the behavior of gap is studied with the calculation of E/ρ to find its influence on capacitive current switching.

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Analytical Prediction of Transient Breakdown Characteristics of SF6 Gas Circuit Breakers

Cited by 7 publications

References 2 publications

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

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

Application of computational fluid dynamics tools to circuit-breaker flow analysis

Study of Shock Wave Development in Cold Flow of Gas Circuit Breaker for Improving Capacitive Current Switching

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