A synthetic test method for evaluating the shunt capacitor switching performance of vacuum circuit breakers

Ohshima, I.; Yokokura, K.; Matsuda, M.; Kanai, Y.; Sato, K.; Yanabu, S.

doi:10.1109/61.103681

Cited by 12 publications

(2 citation statements)

References 6 publications

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“…However, restrikes in VCBs will occur with a large probability when switching off capacitor banks. Restrikes in VCBs will cause overvoltage in electric power system which is harmful to electric equipment [4]. In capacitive making operations, inrush currents with high amplitude and high frequency will flow through the VCB [5].…”

Section: Introductionmentioning

confidence: 99%

Capacitive making of double‐break vacuum circuit breaker: Transverse magnetic field contacts are superior to axial magnetic field contacts

Geng

Chen

Yao

et al. 2022

IET Generation Trans & Dist

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Previous studies mainly focused on the behaviours of single‐break vacuum circuit breakers (VCBs) in switching capacitor banks. The prestrike characteristics of double‐break VCBs subjected to axial magnetic fields (AMFs) and transverse magnetic fields (TMFs) in capacitive making operations, to find a proper structure of double‐break VCBs for capacitive switching are experimentally investigated here. Special attention is given to the prestrike gap, inrush current interruption, prestrike voltage, prestrike electric field strength and erosion on contact surfaces of double‐break VCBs. The results show that the 50% prestrike gap d50 and the scatter in prestrike gaps are significantly reduced by nearly 50% by the TMF double‐break VCB compared with the AMF double‐break VCB. The 50% prestrike arcing time ta50 of the TMF double‐break VCB can be reduced by 37.0% compared with the AMF double‐break VCB. The voltage distribution ratio between two vacuum interrupters (VIs) is more balanced in the TMF double‐break VCB (6:4) than in the AMF double‐break VCB (7:3) when prestrike occurs. The TMF double‐break VCB can reduce the erosion caused by inrush currents on contact surfaces compared with the AMF double‐break VCB. In switching capacitor banks, the TMF double‐break VCB is superior to the AMF double‐break VCB.

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Section: Introductionmentioning

confidence: 99%

Capacitive making of double‐break vacuum circuit breaker: Transverse magnetic field contacts are superior to axial magnetic field contacts

Geng

Chen

Yao

et al. 2022

IET Generation Trans & Dist

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“…A capacitive current switching operation consists of CO operations [8][9]. During a making operation, the contacts of VI approach each other continually.…”

Section: Introductionmentioning

confidence: 99%

Capacitive switching of vacuum interrupters and inrush currents

Yang

Geng

Zhang

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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The objective of this paper is to investigate an impact of the inrush current on the prestrike and restrike characteristics of vacuum interrupters (VIs) during capacitive current switching duty. Eleven 7.2 kV VIs are used. Their contact parameters are contact gap 4 mm and contact material CuCr25 (25%weight of Cr). A series of 80 CO operations are executed for each test VI. The amplitude of inrush current I inrush (3800 Hz) is set to 0 kA, 2 kA, 5 kA and 10 kA, respectively. The switching current is less than 1 A rms. The (1-cosωt) shape of the recovery voltage with a peak of 15 kV is applied to the test VI. The experimental results show that the prestrike and restrike phenomena are significantly influenced by the contact surface conditions damaged by the inrush current. The cumulative probability of the prestrike gap d pre follows a 3parameter Weibull distribution. When I inrush increases from 2 kA to 5 kA, the prestrike gap increases accordingly. The 10% d pre increases from 0.5 mm to 0.7 mm. The 50% d pre increases from 0.7 mm to 1.0 mm. The 90% d pre increases from 1.0 mm to 1.5 mm. The scale in the Weibull distribution, which can describe the scattering of d pre , is 0.2 mm and 0.6 mm in the case of I inrush = 2 kA and I inrush = 5 kA, respectively. It is found that the occurrence frequency of the inrush current interruption increases from 37.9% to 68.3% with the increase of I inrush from 2 kA to 5 kA. Moreover, the inrush current also has an impact on the restrike types, which are classified into three types according to the waveform features. The average restrike probability increases from 4.6% to 17.9% and further to 30.4% with the increase of the inrush current from 0 kA to 2 kA and 5 kA, respectively. In addition, the higher the inrush current, the restrike tends to occur earlier during the recovery voltage period.

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An investigation into major factors in shunt capacitor switching performances by vacuum circuit breakers with copper-chromium contacts

Kamikawaji

Shiori

Funahashi

et al. 1993

IEEE Trans. Power Delivery

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A synthetic test method for evaluating the shunt capacitor switching performance of vacuum circuit breakers

Cited by 12 publications

References 6 publications

Capacitive making of double‐break vacuum circuit breaker: Transverse magnetic field contacts are superior to axial magnetic field contacts

Capacitive making of double‐break vacuum circuit breaker: Transverse magnetic field contacts are superior to axial magnetic field contacts

Capacitive switching of vacuum interrupters and inrush currents

An investigation into major factors in shunt capacitor switching performances by vacuum circuit breakers with copper-chromium contacts

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