Influences on the length and severity of intermittences inelectrical contacts

摘要

This paper deals with short-duration high contact voltage-drops instatic electrical contacts during fretting experiments on tin-platedterminals. The focus lies on the rate of high voltage-drop events overthe fretting cycle, the maximum level of voltage-drops, the influence ofcurrent and the influence of the direction of relative movement. Theparameters used for measuring the contact voltage-drop are an opencircuit voltage of 14 V, a nominal current of 9 mA, 29 mA, 54 mA and 92mA, an amplitude of fretting motion of 0.2 mm and a maximum velocity ofrelative movement between the contact partners of 100 μm/s. Thecontact force is 500 mN+50 mN. It is shown that high voltage-drop eventsoccur in clusters, not as isolated events. The nominal current throughthe contact as well as the open circuit voltage have an influence on theoccurrence of these events. Two different shapes of events have beenidentified, suggesting different conduction mechanisms