Type of busbar

In indoor switchgear and control equipment, busbars are divided into rectangular, circular, D-shaped, U-shaped, etc. according to the cross-section. Among them, the rectangular busbars with the same cross-section have smaller resistance and larger heat dissipation surface than circular, D-shaped, and U-shaped busbars. , high carrying capacity and other reasons, rectangular busbars are most widely used in voltage levels of 40.5kV and below. Circular and D-shaped busbars have better skin effect and good anti-corona effect, and they are also used, but the connection is more complicated. U-shaped busbars are generally used in equipment with large current and high force effect requirements, such as generator outlet switchgear. Its rated current is large, generally above 5000A, and its rated peak withstand current (IP) is large, generally above 50kA. According to the material, it can be divided into copper busbar, aluminum busbar and iron busbar. Among them, copper busbar is the most widely used due to its large carrying capacity, good corrosion resistance and force effect. Aluminum busbars are also used in small current, non-coastal and non-petrochemical systems. The use of iron busbars is mainly considered economically and is mainly used for PT connecting lines. According to the natural state, it can be divided into hard busbar and soft busbar. Soft busbar is mainly used in places where the connection is inconvenient and can absorb some force effects, such as inside the circuit breaker.