Mechanism of Dynamic Voltage Distribution in Series-Connected Vacuum Interrupters

Ge, Guowei; Cheng, Xian; Liao, Minfu; Huang, Zhihui; Zou, Jiyan

doi:10.1109/tps.2018.2852650

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…In addition, the accepted standard for selecting grading capacitors in China is that the voltage unbalanced coefficient should be below 1.1. However, according to China's national standard GB 4787-2010 [21], the preferred minimum for a grading capacitor is 1000 pF in consideration of the function of reducing the steepness of the transient recovery voltage (TRV) [17]. Other researchers have adopted 400 pF grading capacitors for double-break VCBs [19] and 1000 pF grading capacitors for 126 kV triple-break VCBs [17].…”

Section: Grading Capacitor Designmentioning

confidence: 99%

“…However, according to China's national standard GB 4787-2010 [21], the preferred minimum for a grading capacitor is 1000 pF in consideration of the function of reducing the steepness of the transient recovery voltage (TRV) [17]. Other researchers have adopted 400 pF grading capacitors for double-break VCBs [19] and 1000 pF grading capacitors for 126 kV triple-break VCBs [17]. Greater grading capacitor values lead to a decrease in the breaking capacitor value because of the post arc current.…”

Section: Grading Capacitor Designmentioning

confidence: 99%

“…The total interruption time of VCBs with an ultra-fast electromagnetic repulsion mechanism and a fault current detection system can be reduced to 10-20 ms [13]. Based on this technology, several features of double-and triple-break VCBs have been investigated, including the open velocity, voltage distribution, and synchronization of each VCB; additionally, a breaking test has been conducted on prototypes [13,16,17]. Vertical series connected structures of doubleand triple-break VCBs have been investigated with the purpose of analyzing their static voltage distribution.…”

Section: Introductionmentioning

confidence: 99%

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Static Voltage Sharing Design of a Sextuple-Break 363 kV Vacuum Circuit Breaker

Yang

et al. 2019

Energies

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A balanced voltage distribution for each break is required for normal operation of a multi-break vacuum circuit breaker (VCB) This paper presented a novel 363 kV/5000 A/63 kA sextuple-break VCB with a series-parallel structure. To determine the static voltage distribution of each break, a 3D finite element method (FEM) model was established to calculate the voltage distribution and the electric field of each break at the fully open state. Our results showed that the applied voltage was unevenly distributed at each break, and that the first break shared the most voltage, about 86.3%. The maximum electric field of the first break was 18.9 kV/mm, which contributed to the reduction of the breaking capacity. The distributed and stray capacitance parameters of the proposed structure were calculated based on the FEM model. According to the distributed capacitance parameters, the equivalent circuit simulation model of the static voltage distribution of this 363 kV VCB was established in PSCAD. Subsequently, the influence of the grading capacitor on the voltage distribution of each break was investigated, and the best value of the grading capacitors for the 363 kV sextuple-break VCB was confirmed to be 10 nF. Finally, the breaking tests of a single-phase unit was conducted both in a minor loop and a major loop. The 363 kV VCB prototype broke both the 63 kA and the 80 kA short circuit currents successfully, which confirmed the validity of the voltage sharing design.

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Section: Grading Capacitor Designmentioning

confidence: 99%

Section: Grading Capacitor Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Static Voltage Sharing Design of a Sextuple-Break 363 kV Vacuum Circuit Breaker

Yang

et al. 2019

Energies

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“…In addition, they designed a zero zone residual magnetism compensation device for the vacuum arc extinguishing chamber with longitudinal magnetic contact and studied the arcing process under different compensation magnetic eld conditions as well as the effect of magnetism compensation on the postarcing current and breaking capacity of a breaker. [11][12][13][14][15] Cheng et al proposed a high-voltage DC VCB featuring a vacuum arc extinguishing chamber and an SF 6 arc extinguishing chamber connected in series, and tested its current breaking performance. [16][17][18] Song et al studied the method of controlling the motion and contraction of the cathode surface spots in vacuum arcing using a magnetic eld and analyzed how the magnetic eld component affects the cathode surface spot trajectories.…”

Section: Introductionmentioning

confidence: 99%

Study on Impact of Gap Difference on Plasma Distribution of Direct Current Vacuum Circuit Breaker with Double-Break

Huang,

Yin,

Liu

et al. 2023

Preprint

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During the fault current breaking process of a mechanical direct current vacuum circuit breaker (DC VCB) with double-break (DB), the mechanism's dispersion can result in a gap difference between the two breaks. A DB DC VCB breaking experiment platform is constructed in order to investigate the impact of gap difference on plasma distribution during the DB DC VCB breaking process. During the experiment, a high-speed camera is used to capture the vacuum arcing process at the two breaks under varying gap difference conditions. Then, the arc feature parameters and their variations during the zero zone process are extracted using image processing techniques, and the distribution patterns of plasma and arc energy at the two breaks are analyzed and compared. When there is no gap difference between the two breaks of the experimental DB DC VCB, there are no significant differences in arc energy and the sizes of high, medium, and low-temperature plasma zones between the two breaks. When there is a gap difference between two breaks, the break with the smaller gap has larger high and medium-temperature plasma zones, more concentrated arc energy, higher particle concentration, lower arc diffusion velocity and arc energy decay velocity, and a greater amount of residual plasma after the extinguishing of the arc. When the gap difference exceeds a certain threshold, energy spots appear on the contact surfaces, and a high concentration corridor of residual particles remains between the contacts after the current crosses zero, forming a breakdown weak point that eventually leads to arc re-ignition (hence interruption failure) under the action of transient recovery voltage (TRV).

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