Study On The Failure Mechanism Of Reed Cage Copper Terminal Block Caused By Heating Of Current-carrying Conductor

The main reasons for the burning of the reed cage copper terminal block are as follows:

1. Heating of current-carrying conductors: Because the wiring of the main line reed cage copper distribution block in the power conversion cabinet is 16m, the reed has a large elastic force. When the wiring is connected, the reed is not open enough, resulting in the conductor (multi-strand wire) of the wiring part not being pressed into the reed, resulting in a reduction in the actual conductive area, and an abnormal temperature rise when the current passes. Experiments have shown that the mechanical strength of metal conductors decreases due to annealing at high temperatures. When copper exceeds 0, the mechanical strength of copper terminal strip decreases sharply, which reduces the pressure at the contact point between the reed and the conductor, increases the contact resistance, and causes more serious heating. At the same time, due to the heat, the contact surface of the conductor is strongly oxidized, generating copper oxide with a resistance much greater than that of the conductor itself, which greatly increases the contact resistance, causing a sharp increase in the heat at the contact point, forming a vicious cycle, causing the contact point of the conductor to loosen, deform, and even melt.