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For long service functioning of semi permanent contacts, an optimal and stable contact force is needed. Mechanical stability of contacts leads to reliable electrical performance of the connector. However, a lowering of this contact force is often observed during operations. In a previous paper, information about the contact force was obtained from insertion force measurements together with the friction...
The behavior of the arc formed during electrical circuit opening is examined, in the presence of a pulsed magnetic field. The field is applied in the inter-electrode gap where the arc develops. The opening sequence may be separated into two temporal phases. During the first phase, the arc remains stuck at the same position as under zero field. This is ascribed to the existence of a sticking force,...
The long service duration functioning of semi permanent contacts throughout their lifetime relies on having a stable contact force. This stability leads to reliable mechanical and electrical performance of the connector. In a previous study, the contact force was evaluated using the insertion force and the friction coefficient. This usual friction coefficient of the contact material (gold coating...
In the field of electrical contacts, carbon has been rarely investigated but carbon is more and more used in the automotive field. This is especially true in membrane switching technology, which is commonly used in the control field such as in remote controls, automotive switches, mobile phones, etc. This technology is based on a mobile contact, mounted on flexible elastomeric parts which are pressed...
Membrane switching technology is commonly used to operate electrical apparatus such as remote controls, automotive switches, mobile phones, etc. This technology is based on a movable contact, mounted in a supple elastomer frame which allows the contact to be pressed against a stationary contact, mounted on a Printed Circuit Board (PCB). The material of the movable contact is typically a carbon-loaded...
In order to improve the safety of potentially hazardous situations such as "hot" disconnections of equipment or deteriorated connections, a deeper knowledge of the characteristics of the arcs thus produced and their subsequent damage to contact materials, insulating and wiring, is needed. Numerous studies have been performed on DC arcs as they appear in automotive applications. There is...
In membrane switching technology, a mobile contact, mounted on supple elastomeric parts is pressed onto a static part of the PCB by means of a knob. This technology is commonly used for keyboards in stationary applications where the contact material is made of carbon film while the PCB is coated with a gold layer. For automotive applications that require high reliability and low cost switches, further...
It is well known that vibration of contact interfaces is the main cause of contact degradation by the so called fretting corrosion phenomenon. In fact the process of generating particles by mechanical wear produces an increase of contact voltage, frequently manifested by a high contact resistance in low power and signal connectors. In high power connectors, this degradation is expected to be accentuated...
Speed separation in switches and relays is a fundamental parameter to improve breaking devices performances by reducing extinction gap and arc duration. It is commonly admitted, that with resistive load, high speed separation produces lower arc duration and keeps constant extinction gap, whereas with inductive load, the extinction gap is enlarged. The objective of this paper is to minimize the gap...
It is well known that vibrations of contact interfaces are the main cause of contact degradation by the so called fretting corrosion phenomena. In fact the process of generated particles by mechanical wear produce either the increase of contact voltage accompanied with rapid fluctuations. The main objective of this work is to examine the electrical behaviour of contact interface under vibration and...
The erosion rate of electrical contacts is a fundamental parameter to understand and evaluate the performances of contact materials and their breaking devices such as the life time. In this study, we have focused our interest on the erosion in automobile applications under the 14 VDC power network. The experimental apparatus, adapted to perform contact breaking in similar conditions to the automotive...
Erosion rate of electrical contacts is a very important parameter to understanding and evaluating the performances of contact materials and switching devices such as the life time. The most common measurement of arc erosion is the mass change of the contacts, determined by the weighing of the anode and the cathode, before and after the electrical tests. The erosion is well known to be a transfer from...
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...
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