Potential Phenomenon Of Overheating In Bimetallic Terminal Wires

Poor contact of type bi metallic cable lugs manifests as overheating of the wire. This usually includes signs such as bimetal cable lug or a persistently high surface temperature of the wire, which can be felt when touched. In severe cases, the wire insulation may be deformed or discolored.

The root cause of overheating in wires is often an abnormal increase in the resistance at the contact interface. bimetal terminal lug If the metal contact surface is contaminated, oxidized, corroded, or loosened, a stable low-resistance connection cannot be maintained. Since heat is generated according to I²·R when current flows, an increase in contact resistance will cause localized high temperatures.

In long-term operating equipment, even without initial obvious abnormalities, the contact interface may gradually deteriorate due to vibration, thermal cycling, environmental humidity, or corrosion. This gradual process may be latent for a considerable period, but will trigger overheating under heavy load or environmental degradation. Multiple studies consider surface oxidation or micro-damage caused by dissimilar metal contacts as a major failure mechanism.