Bolted connections involve overlapping busbars and securing them with bolts and nuts, often with flat washers to distribute pressure. This method is versatile, reliable, and allows on-site assembly, but requires drilling or punching holes, which can slightly distort current flow and create non-uniform contact pressure .
Clamped joints use external clamps around overlapping busbars to create uniform contact pressure without drilling holes. This reduces joint resistance and improves current flow, though it requires more space and can be more expensive than bolted joints .
Welding techniques, including traditional welding, braze welding, and friction stir welding, provide continuous conduction paths with minimal resistance. These methods are ideal for permanent connections and high-current applications but are less flexible for maintenance or replacement .
Rivets join busbars by creating holes and securing them with metal pins. This method is cost-effective and provides a tight joint, though it is less common in modern high-current systems .
Special compression connectors apply pressure to secure busbars, suitable for high-current applications. They ensure low-resistance connections and are often used in industrial or substation environments .
These connections allow busbars to be easily connected and disconnected, facilitating maintenance and replacement. They are commonly used in modular systems .
Busbars can be connected to wires or lugs using crimping tools, often with insulating sleeves to protect conductors. This method is practical for integrating busbars with other electrical components .
The choice of connection method depends on factors such as current-carrying capacity, mechanical strength, ease of maintenance, and installation environment. Proper torque, contact pressure, and adherence to standards (e.g., IEC 62271-301) are critical to ensure low resistance, minimal heat generation, and long-term reliability .
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