TY - CHAP

T1 - The effect of contact spot fragmentation on the shock short-circuit currents heating of electric contacts

AU - Klochko, S.V.

AU - Pavleyno, O.M.

AU - Safonov, M.S.

N1 - KLOCHKO, S.; PAVLEYNO, O.; SAFONOV, M.. The effect of contact spot fragmentation on the shock short-circuit currents heating of electric contacts. In: Materials Science and Condensed Matter Physics. Editia 7, R, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, p. 322.

PY - 2014

Y1 - 2014

N2 - Any even specially treated surfaces of electrical contacts are not perfect in shape. This fact is caused by deviations of different kind and different scale. They are typically classified into [1] subroughness, roughness, waviness (quasi-periodic deviations) and macro deviations (single technological surface defects). These lead to fragmentation of contact spots: but a part of contact surface is conductive. Fragmentation causes the potential and the current density distributions to be distorted in the contact vicinity. It can change the magnitude of the contact resistance and affect the dynamics of the heating when the current passes through contacts. In this work, we analyzed the effect of fragmentation on the high-current contact heating when shock short-circuit currents pass through them. We used numerical calculations performed in ANSYS to assess the impact of macro deviations and waviness on the temperature change in contacts. The effect of material softening and associated changes in the surface profile on parameters of electrical contacts was also evaluated. The results are compared with the data of similar calculations performed in the approximation of fully conductive contact spots [2].

AB - Any even specially treated surfaces of electrical contacts are not perfect in shape. This fact is caused by deviations of different kind and different scale. They are typically classified into [1] subroughness, roughness, waviness (quasi-periodic deviations) and macro deviations (single technological surface defects). These lead to fragmentation of contact spots: but a part of contact surface is conductive. Fragmentation causes the potential and the current density distributions to be distorted in the contact vicinity. It can change the magnitude of the contact resistance and affect the dynamics of the heating when the current passes through contacts. In this work, we analyzed the effect of fragmentation on the high-current contact heating when shock short-circuit currents pass through them. We used numerical calculations performed in ANSYS to assess the impact of macro deviations and waviness on the temperature change in contacts. The effect of material softening and associated changes in the surface profile on parameters of electrical contacts was also evaluated. The results are compared with the data of similar calculations performed in the approximation of fully conductive contact spots [2].

UR - https://ibn.idsi.md/ro/vizualizare_articol/74458

M3 - Conference abstracts

SP - 322

BT - Materials Science and Condensed Matter Physics Editia 7, R, 2014

CY - Chișinău

T2 - 7th International Conference on Materials Science and Condensed Matter Physics

Y2 - 16 September 2014 through 19 September 2014

ER -