Dipendenza delle connessioni crimpate dagli stress meccanici e termici

Cables headed with crimped lugs are frequently used in test laboratories in temperature rise tests carried out to validate electrical devices. The increase of the electrical resistance of the crimped connections can lead to high dissipation of power and heat during these tests, impairing their outcome. This work consisted in the evaluation of the dependence of the electrical resistance and of the dissipated power of crimped connections when they are submitted to mechanical and thermal stresses. This resistance resulted more sensitive to thermal stresses than to mechanical ones. A limit of the dissipated power from crimped connections in the temperature rise tests was estimated to be about 4 W corresponding to an electrical resistance of 25 µΩ for tests made at 400 A. Respecting these limits could avoid wrong rejections of equipment under test.