The processing requirements of the bus slot are: high precision, strong interchangeability, easy assembly and disassembly. When the installation requirements can be easily inserted, the bus slot connector is the key, requiring high machining accuracy, good interchangeability. Busbar connector must meet three requirements: first, the contact resistance is small; second, it can automatically eliminate the damage of thermal stress. The basic structure is: if one side contact surface is very smooth, no pressure point, single screw connection of large capacity busbar with parallel two or 3 parallel screw screw, both ends of a butterfly shaped washer locking, locking torque are provided, and the contact pressure should be kept unchanged, to automatically eliminate thermal stress.
Busbar temperature rise should be selected in order to achieve the safe operation of its rated capacity, as the foundation with sufficient cross-sectional area to the service life and reliable work of the wire as the only criterion judging busbar busbar section, there seems to be enough, but the risk may also have high L. The maximum allowable temperature rise is 55 degrees. Of course, with a larger cross-section can reduce the voltage drop and temperature rise.
The main limiting factor of the good working life of busbar is the gradual thermal aging of insulation. The working life of the insulating material is shortened by about half, when the working temperature is increased by 10 DEG C. Busbar in the busbar in the short-circuit current appears to be subject to considerable electromagnetic force, the unit length of the bus and the force generated by the short circuit current is proportional to the force, and the distance between the bus inversely proportional.