Some investigations on slow and fast arc voltage fluctuations for contact materials proceeding in various gases and direct current

Jemaa, N. Ben; Queffelec, J. L.; Travers, D.

doi:10.1109/33.76519

Cited by 22 publications

(6 citation statements)

References 8 publications

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“…Let us consider the curve for 42VDC. Up to 2ms, the arc duration versus current characterizes an arc in metallic phase (regime 1 or anodic arc) whereas at longer time it characterizes an arc in gaseous phase (regime 2 or cathodic arc) [5,6]. These effects were extensively discussed in previous publications.…”

Section: What Are the Consequences Of An Increase In Current And / Ormentioning

confidence: 96%

New contact material for reduction of arc duration for dc application

Doublet¹,

Jemaa

Rivoirard

et al. 2010

Eur. Phys. J. Appl. Phys.

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:The phenomenon of arcing is the major cause of electrical contact degradation in electrical switches. Degradation involves contact erosion and/or welding. The use of special contact material and that of specific material processing may permit contact erosion to be reduced, in particular by shortening the arc duration. A short review of these approaches is presented in the first part of this paper. In the second part, the development of a new self-blowing contact material is described. This material has been tested under DC voltages from 14 V to 42 V. A reduction of the arc duration by a factor of 4 approximately was obtained as was a concomitant reduction of the extinction gap to less than 2 mm. This material will contribute to achieving better reliability in high current-high voltages breaking devices, and will aid in their miniaturization, e.g. in relays.

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Section: What Are the Consequences Of An Increase In Current And / Ormentioning

confidence: 96%

New contact material for reduction of arc duration for dc application

Doublet¹,

Jemaa

Rivoirard

et al. 2010

Eur. Phys. J. Appl. Phys.

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“…As expected from the literature [12,13] the arc voltage starts at 12V and finishes at 25V which corresponds to the metallic phase and gaseous phases. The duration of 600 ms corresponds to a 0.75mm arc length, shared between these two phases.…”

Section: Experimental Setup and Processsupporting

confidence: 75%

Evaluation of arcing damage on connector for 42V automotive power net

Razafiarivelo¹,

Porte²,

Jemaa³

et al.

Proceedings of the 50th IEEE Holm Conference on Electrical Contacts and the 22nd International Conference on Electrical Contact

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The conversion of the power network system voltage from 14 VDC to 42 VDC is accompanied by a discontinuous change of arcing energy produced during live intentional or accidental unplugging. This necessitates a modification of electrical breaking and connecting devices. For the connectors, it results in adding the capability of withstanding arcing during live disconnection to the basic characteristics of high conduction and low insertion effort. To quantify this new capability and the correlated level of arc damage, the authors propose to correlate the insertion criteria "insertion force" with the parameters "arc energy" and current level. Compared with our previous work, the introduction of the current parameter allows us to attribute the origin of the damage to the connector to the overheating of the contacts by heat conduction mechanisms supplied by the arc. As intermediate results, the influence of the opening speed and the contact coating on the arc energy increase is confirmed. The obtained results will help to characterize and to select arcresistant interconnection solutions in the field of the high power automotive applications.

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“…On the last histogram, some levels close to 12V appear with a low occurrence. These levels are typical to an arc voltage [9] and attest the arc occurrence. This is confirmed by the arc voltage capture represented on the Figure 7 where we can clearly see successive 12V voltage plateaus during few ten hs.…”

Section: Test Conditionsmentioning

confidence: 71%

Electrical contact behaviour of power connector during fretting vibration

Jemaa

Carvou

2006

Electrical Contacts - 2006. Proceedings of the 52nd IEEE Holm Conference on Electrical Contacts

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It is well known that vibration of contact interfaces is the main cause of contact degradation by the so called fretting corrosion phenomena. In fact the process of generated particles by mechanical wear produce the increase of contact voltage frequently assimilated as high contact resistance in low power and signal connector. In high power connector, this degradation is expected to be accentuated by thermal effect generate by increasing contact voltage to melting and arcing voltage. The main objective of this work is to examine conjointly the wear amount and electrical behaviour of connector terminal under vibration and higher current stress. The spring lamellas of an automotive connector are submitted to high number of vibrations (103 to 106) whereas the pin is firmly attached to a fixed support. High frequency oscillation (100Hz) with amplitude of 50ptm is used. The contact is made with copper alloy and coated with 2ptm of tin. The contact is inserted in resistive circuit supplied by 20V and 3A. The contact voltage is measured with fast sampling oscilloscope and the voltage histogram is built in real time. So, the removed mass in the track are evaluated by micro weight (I 1tg). The main results show that at low level of wear observed during the earlier stage of fretting corresponds to pure constriction voltage <2OmV. However after this initiation period as the wear is increased, the contact voltage is increased and reaches few hundred millivolts (melting and fritting voltage). Finally in later stage of degradation, arcing voltage due to bounce phenomena is detected close 12V. This short arc, observed for the first time in fretting area under power could accentuate the wear and the degradation process by erosion and mass transfer.

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Some investigations on slow and fast arc voltage fluctuations for contact materials proceeding in various gases and direct current

Cited by 22 publications

References 8 publications

New contact material for reduction of arc duration for dc application

New contact material for reduction of arc duration for dc application

Evaluation of arcing damage on connector for 42V automotive power net

Electrical contact behaviour of power connector during fretting vibration

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