Relationship between Length and Diameter of Contact Bridge Formed under Thermal Equilibrium Condition

Ishida, Hideyuki; Taniguchi, Masanari; Sone, Hideaki; Inoue, Hiroshi; Takagi, Tasuku

doi:10.1093/ietele/e88-c.8.1566

Cited by 11 publications

(3 citation statements)

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“…The degradation can be simulated by very accurate electrodes separation system using cantilever [1]. Separation gap was less than 1µm step by step with a sufficient time so that the contact spot temperature reaches the thermal equilibrium condition [2], and we got the gap from several to more than ten micrometers but still current continues to flow through bridge (named dark bridge [1]). In the practical situation, the thermal stress can deform the contact spot [3] and the non-luminous bridge (dark bridge) may be produced to maintain the current flow.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear and Negative Resistance in Loose Electrical Contacts Dark Bridge

Kubota¹

2013

AJPA

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The dark bridge in loose electrical contacts was investigated, which grew up when the contact gap was increased a little with micron by micron. The dark bridge was watched by microscopic camera along with measurement of voltage-current (V-I) relationship. At very small gap (less than 19µm for iron (Fe) contacts but different from materials), the V-I characteristics were linear, which is normal, but more than the 20~30µm, the non-linear relationship appeared and finally the negative resistance was observed. Experimental growth of dark bridge was shown in case of Pd. The nonlinear and negative resistance phenomena were tested for Fe. The resistance was analyzed and showed that it goes to negative one after crossing zero from positive region.

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Section: Introductionmentioning

confidence: 99%

Nonlinear and Negative Resistance in Loose Electrical Contacts Dark Bridge

Kubota¹

2013

AJPA

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“…Since the 19 th century, Utsumi reported that the molten bridge could be divided into the static bridge and the dynamic one according to the separating velocity, and the critical velocity of the bridge is found to be directly related to the load current and the properties of metal material [1] . The contact bridge is also classified into a bright bridge and a dark one, and the typical dark bridge correlates with the thermal equilibrium condition under low separate velocity [2] . Due to the fact that the breaking velocity is decreased to some extent, it is possible that the whole process of molten bridge waveforms and images can be observed explicitly.…”

Section: Introductionmentioning

confidence: 99%

Formation Process of Intermittent Molten Bridge Between Au-Plated Contacts at Super Low Breaking Velocity

Ren

Cheng

Chen

2016

Plasma Sci. Technol.

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This paper presents the molten bridge behaviors of Au-plated material at super low breaking velocity conditions by introducing our new designed test rig. The typical waveforms of the contact voltage and contact force during breaking are investigated under the load of 5-25 V/0.2-1 A and velocity of 25-150 nm/s. It is shown that the intermittent molten bridge is formed from the competition of multitude contact a-spots for current distribution and the solidliquid mixing characteristics of a molten bridge. Also, it is proved that the bridge is not composed by the completed melted metal by using FEM thermal simulation and the voltage-temperature relation. The observed surface morphology reveals that the scattered and stacked melted regions are attributed to the intermittent bridge. Finally, the effects of breaking velocity and electrical load on bridge length and duration are also analyzed.

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“…Research on the behavior of molten bridges has always been an important basic issue in the electrical contact subject, so it is significant to study the behavior of molten bridges of AgSnO 2 electrical contact material [18] . The molten bridge can be divided into dark bridge and glow bridge [19,20] . The dark bridge is a molten bridge which is in the state of heat balance during the slow separation of the contact pair.…”

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confidence: 99%

High Speed Imaging Observation on Molten Bridge of AgSnO 2 Electrical Contact Material

Chen

Song

Muyang

et al. 2017

Rare Metal Materials and Engineering

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An electrical contact-high speed imaging experimental system was developed to study the basic characteristics and laws of molten bridges of AgSnO2 electrical contact material. On the one hand, the quantitative measurements were investigated by high speed imaging technology. On the other hand, the microstructure and element distribution on the surface of contacts were analyzed by SEM and EDS after molten bridges behavior. Results indicate that the evolution behavior of molten bridges of AgSnO2 contacts can be divided into three regimes: the initial melting period, a stable period and an unstable period during which it eventually ruptures. Molten bridges and arc can exist simultaneously in which there is some cooperation and competition relationship. The dimension of molten bridges of AgSnO2 contact material is micron scale, the diameter of molten bridges increases with the increase of current and the length decreases with the increase of current. In the process of the evolution behavior of molten bridges, the feature of molten bridges can be divided into three types: the pier, follow by the cylindrical and the dumbbell. The morphology and element distribution of the contacts surface are changed by the behavior of molten bridges.

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Relationship between Length and Diameter of Contact Bridge Formed under Thermal Equilibrium Condition

Cited by 11 publications

References 0 publications

Nonlinear and Negative Resistance in Loose Electrical Contacts Dark Bridge

Nonlinear and Negative Resistance in Loose Electrical Contacts Dark Bridge

Formation Process of Intermittent Molten Bridge Between Au-Plated Contacts at Super Low Breaking Velocity

High Speed Imaging Observation on Molten Bridge of AgSnO 2 Electrical Contact Material

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