Change in Electric Contact Resistance of Low-Voltage Relays Affected by Fault Current

Książkiewicz, Andrzej; Dombek, Grzegorz; Nowak, Karol

doi:10.3390/ma12132166

Cited by 14 publications

(7 citation statements)

References 22 publications

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“…The contact blow-open process is a complex one, dependent on the pre-open phenomena [25] and on electrodynamic forces [15,22,26,27]. The current thrusts of research are the effects of blow-open contact bounce on contact welding and the phenomena behind it [4,5,13,26].…”

Section: Resultsmentioning

confidence: 99%

Electrodynamic Contact Bounce Induced by Fault Current in Low-Voltage Relays

et al. 2019

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Due to fault currents occurring in electrical installations, high electromagnetic force values may be induced in current paths of low-voltage electromagnetic relays. This force may lead to an electromagnetic bounce that will further result in an electric arc ignition between contacts, and under some circumstances, it will result in contact welding. For the proper exploitation of relays, the threshold value of the maximum current, and thus the electrodynamic force, should be known. This force depends on several factors, including: contact materials, dimensions of relay current paths, relay electromagnetic coil, etc. This paper presents the results of calculations and an experiment on electromagnetic forces, which cover these factors. A static closing force, acting on the contacts, and the fault current were measured. As a result, values of the force and current threshold were obtained, which inform when an electrodynamic bounce may occur. The obtained result may be used in designing contact rivets and relay current paths together with the selection of adequate fault protection devices.

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Section: Resultsmentioning

confidence: 99%

Electrodynamic Contact Bounce Induced by Fault Current in Low-Voltage Relays

et al. 2019

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“…Unit loss figures are extracted from a commercial power relay for ensuring realistic assessment even though relative units such as number of relays crossed would yield to similar conclusions. The chosen relay [12] has a static power consumption of 1.7W, a maximum DC current of 50A and uses AgSnO2 as contact material that presents an average contact resistance of 2mΩ [11]. The comparison is made by analyzing the shortest paths allowing to connect a pair of source-load.…”

Section: Efficiency Analysismentioning

confidence: 99%

A Flexible Power Crossbar-based Architecture for Software-Defined Power Domains

Gregorio¹,

Sassatelli²,

Gamatié³

et al. 2020

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

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“…For example, Carvou et al 5 simulated its mating test in the working state and quantified the contact resistance in its contact area by studying the power connector. Ksiazkiewicz et al 6 studied the variation of electric contact resistance of low-voltage relays affected by fault current, and found the flow of significant current through electric contacts may influence the contact surface and thus the value of the electric contact resistance (ECR). Kim et al 7 studied the influence of surface roughness, oxidation, and pollution on the variation of contact resistance of electrical connectors.…”

Section: Introductionmentioning

confidence: 99%

Evolution of contact performance of industry electrical connector based on reliability accelerated testing

Han

Pan

et al. 2021

Advances in Mechanical Engineering

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The evolution of contact performance of electrical connectors, as an expression of service performance, played a significant role in various electronic equipment or system. However, very few methods had been used to detect the evolution of contact performance effectively and accurately. Hence, in this research, reliability accelerated testing was conducted to investigate the evolution of contact performance of electrical connectors. To detect the evolution of contact performance, contact resistance and friction and wear of the connector were measured using a DC resistance tester and an electron microscope respectively. Also, the effect of external conditions such as ambient temperature, mating speed, mating cycles was statistically investigated, and evolution curves were developed for contact resistance and abrasion loss. The obtained results revealed the temperature and mating speed affected the contact performance of electrical connectors. The increment of temperature reduced the shear strength of material and increased the thickness of oxide film. Increased mating speed greatly increased the probability of fracture of micro-protrusion due to collision, the wear form of connector had realized transition from low-speed adhesive wear to high-speed peeling wear. In addition, when the connector was mated about 3000 cycles, the contact performance of the connector would be greatly decreased.

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Change in Electric Contact Resistance of Low-Voltage Relays Affected by Fault Current

Cited by 14 publications

References 22 publications

Electrodynamic Contact Bounce Induced by Fault Current in Low-Voltage Relays

Electrodynamic Contact Bounce Induced by Fault Current in Low-Voltage Relays

A Flexible Power Crossbar-based Architecture for Software-Defined Power Domains

Evolution of contact performance of industry electrical connector based on reliability accelerated testing

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