New contact material for reduction of arc duration for dc application

Doublet, L.; Jemaa, N. Ben; Rivoirard, Sophie; Bourda, C.; Carvou, Erwann; Sallais, D.; Givord, D.; Ramoni, P.

doi:10.1051/epjap/2010018

Cited by 15 publications

(13 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 as a function of the nominal current, for 42 V DC nominal voltage and under 4 magnetic field strengths: 0, 0.5, 2.7 and 34 mT. Note that 34 mT is equal to the field generated by the magnetic material-bond contact described in our previous work [1].…”

Section: A Magnetic Field and Current Dependence Of Arc Durationmentioning

confidence: 88%

“…Within the gap, the field homogeneity, as measured with a Hall probe and in agreement with micromagnetic calculations, is of the order of 5% for all experimental conditions. The apparatus used for the contact performance tests has been described in previous papers [1], [6] (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…These two requirements are somehow contradictory since the switch's performances tend to decrease together with the switch's dimensions. In a recent paper [1], we have shown that low current switches can be made exploiting arc magnetic blowing and which satisfy both above requirements. In these switches, a transverse magnetic field is created by a magnetic material inserted in the contact itself.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Blowing of Break Arcs up to 360 VDC

Vassa¹,

Carvou

Rivoirard³

et al. 2010

2010 Proceedings of the 56th IEEE Holm Conference on Electrical Contacts

Self Cite

View full text Add to dashboard Cite

The phenomenon of magnetic blowing allows drastic reduction in arc duration. It is of specific interest in DC applications, more specifically in automotive applications. Blowing exploits the action of the magnetic force on the transitory arc formed during circuit opening. A new contact was described in a previous paper in which the magnetic field required for blowing is generated by the contact material itself. In the present study, aimed at a more thorough analysis of magnetic blowing, an external adjustable magnetic field (up to 320 mT) was produced by placing magnets on each side of the contact. The experiments were performed for voltage values from 42 V DC to 360 V DC and currents up to 100 A, using a resistive circuit. For considered magnetic field values, no magnetic blowing was observed below a certain critical current. At high current, the arc duration was found to be approximately current independent, following a phenomenological B 1variation. Under 42 V DC and the maximum current of 100 A, the arc duration under 320 mT was reduced by a factor of 100 as compared to the arc duration under zero field. Qualitative account of the present phenomena is obtained by considering that blowing is governed by the competition between the magnetic force acting on the arc and the force acting against arc motion, originating from the enthalpy expense needed to move the arc from a heated region at the contact surface to a colder one.

show abstract

Section: A Magnetic Field and Current Dependence Of Arc Durationmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Blowing of Break Arcs up to 360 VDC

Vassa¹,

Carvou

Rivoirard³

et al. 2010

2010 Proceedings of the 56th IEEE Holm Conference on Electrical Contacts

Self Cite

View full text Add to dashboard Cite

show abstract

“…After some switching operations, the immobility time and the velocity of the running arc are expected to dominate. Both values are depending on the material composition [8,9], as well as device properties. Thermal FEM-calculations with a moving arc root reveal that slower arc root movement limits the amount of molten volume (Fig.…”

Section: Influence Of Materials Parametersmentioning

confidence: 99%

Basic Investigations on the Behavior of Advanced Ag/SnO2 Materials for Contactor Applications

Kratzschmar

Herbst

Mützel

et al. 2010

2010 Proceedings of the 56th IEEE Holm Conference on Electrical Contacts

View full text Add to dashboard Cite

Higher power density and longer electrical lifetime at the same time are the main technical targets in development of contactors. Therefore, a close matching of contact material and switching device as well as the understanding of the material-device-interactions is necessary to achieve those demands. The paper will demonstrate the general influence of different material parameters based on Ag/SnO 2 in model switch tests and off-the-shelf contactors under various load conditions. The basic tendencies of the materials can be seen in both test series, but are partially counterbalanced by device specific effects like electrodynamic lift-off, unbalanced erosion between single pairs of contacts or the rise in contact resistance. Since under different load conditions welding, erosion and contact resistance vary, contact materials with 12-14% metal oxide content and special additives appeared to be the best choice for contactor development.

show abstract

“…The anode and cathode spots were observed to move together and arc duration is reduced by the external magnetic field. Contacts with embedded magnetic material was also reported [11] to affect arc duration.…”

Section: Introductionmentioning

confidence: 98%

Study of Arc Mobility and Reignition in a Static Gap Discharge with Magnetic Field

Leung¹,

Harman²,

Doublet³

et al. 2010

2010 Proceedings of the 56th IEEE Holm Conference on Electrical Contacts

View full text Add to dashboard Cite

Arc mobility on contact surface is an important factor in contact erosion and circuit interruption. The two stages of arc mobility are the initial immobile arc followed by the running arc. Past work in the literature showed that immobile arc time is dependent of contact material, current and contact separation speed until a minimum separation speed is reached. When the arc is in the running stage, then contact material strongly affects arc velocity. In this paper, we re-examine the contact material effect with analysis of the arc spot eroded surface morphology to compare material modifications that can affect the arc mobility and reignition. A static gap discharge with various external magnetic field strength is used to affect the arc mobility. Several groups of contact materials are examined including Ag or Cu, Ag, and in composites with C, W, WC, CdO, SnO2.

show abstract

New contact material for reduction of arc duration for dc application

Cited by 15 publications

References 7 publications

Magnetic Blowing of Break Arcs up to 360 VDC

Magnetic Blowing of Break Arcs up to 360 VDC

Basic Investigations on the Behavior of Advanced Ag/SnO2 Materials for Contactor Applications

Study of Arc Mobility and Reignition in a Static Gap Discharge with Magnetic Field

Contact Info

Product

Resources

About