Switching behavior of different contact materials under capacitive switching conditions

Korner, F.; Lindmayer, M.; Kurrat, Michael; Gentsch, D.

doi:10.1109/deiv.2008.4676754

Cited by 24 publications

(13 citation statements)

References 4 publications

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“…Yokokura et al [3] found that Cu W contact material was the best material for a back-to-back capacitor switching duty compared with CuTeSe, CuBi and CuCr. Korner et al [4] showed that a pair of spiral type contacts had a better dielectric behavior than a pair of butt type contacts as the erosion areas caused by pre-arcing are larger. However, research so far has no efficient method to reduce the restrike phenomena in back-to-back capacitor switching by using VIs.…”

Section: !Nt Ro D Uct Ionmentioning

confidence: 98%

“…In back-to-back capacitor switching, a prestrike can cause an inrush current in range of several kilo-amperes at a kHz frequency to flow through a VI during a making operation [4]. The arc foot of the prestrike arc on either electrode melts the contact surfaces locally, which may finally cause a contact welding after the two contacts touch together.…”

Section: Disscussionmentioning

confidence: 99%

“…The test condition is set to the worst case, in which the switching current is less than 1 A. In contrast, the switching current with hundreds of amperes would have a conditioning effect [4,7]. The peak value of the recovery voltage is about 15 kV (2·Upeak).…”

Section: Experiments a L Setupmentioning

confidence: 99%

“…Back-to-back capacitor switching is one of the most challenging tasks for vacuum interrupters (VIs) [1][2][3][4]. A back-to-back capacitor switching CO operation includes two processes: a making process and a subsequent breaking process.…”

Section: !Nt Ro D Uct Ionmentioning

confidence: 99%

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Back-to-back capacitor switching performance of vacuum interrupters after high frequency sub-microsecond voltage impulse conditioning

Yang

Geng

Liu

et al. 2013

2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)

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The objective of this paper is to investigate back-to-back capacitor switching restrike characteristics of vacuum interrupters (VIs) after conditioning by using a series of high-frequency sub-microsecond voltage impulses. 7.2 kV VIs are conditioned by several hundreds of batches of sub-microsecond high voltage impulses (1000Hz, O.ls). The peak value of each impulse reaches 100kV. If a breakdown occurs under a voltage impulse, a high frequency conditioning current of several kA (peak value) would flow through the VI. Then the back-to-back capacitor switching tests are carried out at the inrush currents with peak values of 2 kA and 5 kA, respectively. The peak value of the recovery voltage reaches about 15 kV. The experimental results show that the restrike probability can be reduced significantly by using this high frequency voltage impulses conditioning method. By using VIs which are not conditioned as a benchmark, the restrike probability of the conditioned VIs is reduced from 17.9% to 9.6% at the inrush current of 2 kA. With a higher inrush current of 5 kA, the restrike probability reaches higher to 30.4% with the no conditioned VIs. However, the restrike probability reduces significantly to 7.9% after the conditioning. For VIs which are conditioned, the contact surfaces are fully covered by the molten metal layer resulting from the conditioning current.The contact welding areas caused by the inrush current are much broader and the depths are much shallower than that of VIs in benchmark. !NT RO D UCT IONBack-to-back capacitor switching is one of the most challenging tasks for vacuum interrupters (VIs) [1][2][3][4]. A back-to-back capacitor switching CO operation includes two processes: a making process and a subsequent breaking process. During the making process, a prestrike arc occurs in the vacuum gap once the electric field strength exceeds the dielectric strength between the two contacts. Then a high frequency and high amplitude inrush current flows through the VI. The contact surfaces are locally melted by the prestrike arc. At last the two contacts could be welded together.During a following breaking operation, the welding area is ruptured. Then the protrusions, craters and particles could be generated on the contact surfaces.

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Section: !Nt Ro D Uct Ionmentioning

confidence: 98%

Section: Disscussionmentioning

confidence: 99%

Section: Experiments a L Setupmentioning

confidence: 99%

Section: !Nt Ro D Uct Ionmentioning

confidence: 99%

See 2 more Smart Citations

Back-to-back capacitor switching performance of vacuum interrupters after high frequency sub-microsecond voltage impulse conditioning

Yang

Geng

Liu

et al. 2013

2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)

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“…A study by Yokokura et al [6] showed that CuW contact material was the best material for a back-to-back capacitor bank switching duty compared with CuTeSe, CuBi and CuCr. Komer et al [7] showed that a pair of spiral type contacts had a better dielectric behavior than a pair of butt type contacts as the erosion areas caused by pre-arcing are larger. But the difference between two tested CuCr 75/25 contact material production lots is of minor importance.…”

mentioning

confidence: 98%

Back-to-back capacitor bank switching performance of vacuum interrupters: Comparison of three contact materials

Yang

Geng

et al. 2013

2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)

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Back-to-back capacitor bank switching is a specific operation which combines an inrush current during a making process and a power frequency current interruption followed by a subsequent DC recovery voltage during a breaking process. For a vacuum interrupter (VI), the dielectric strength is mainly depends on the condition of the contact surfaces which ma y be damaged by a pre-arcing of the inrush currents. So the contact material and the fabrication process of the contact pl ay an important role on back-to-back capacitor bank switching behaviors. The objective of this paper is to investigate the back-to-back capacitor bank switching performance of vacuum interrupters with three different contact materials (infiltration CuCr 50, vacuum induction melting CuCr40TeO.005 and vacuum arc melting CuCr 50). The three different contact materials are installed in nine 12kV VIs which undergo a series of back-to-back capacitor bank switching tests at an inrush current of 8 kA (peak value, frequency 3800 Hz). The experimental results show that the average value of the restrike probabilities of the VIs for each contact material are that vacuum induction melting CuCr40TeO.005 is 5.8%, infiltration CuCr 50 is 6.7% and vacuum arc melting CuCr 50 is 8.3%. For all VIs, the restrikes mainly occur between (1I4)·T and 10·T of the recovery voltage (T is a cycle of the recovery voltage that is 20 ms). Many reignitions also occur before (114)· T. The number of reignition follows the order of vacuum induction melting CuCr40TeO.005 (1 times) < vacuum arc melting CuCr 50 (9 times) < infiltration CuCr 50 (10 times).

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Analysis of failure of a circuit breaker employed for capacitor switching: A review

Salodkar

Ghate

Kalwaghe

2017

2017 7th International Conference on Communication Systems and Network Technologies (CSNT)

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Switching behavior of different contact materials under capacitive switching conditions

Cited by 24 publications

References 4 publications

Back-to-back capacitor switching performance of vacuum interrupters after high frequency sub-microsecond voltage impulse conditioning

Back-to-back capacitor switching performance of vacuum interrupters after high frequency sub-microsecond voltage impulse conditioning

Back-to-back capacitor bank switching performance of vacuum interrupters: Comparison of three contact materials

Analysis of failure of a circuit breaker employed for capacitor switching: A review

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