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Selection method of copper bar
Release time:
2024-05-23
Copper busbar, also known as copper busbar or copper busbar, is made of copper material
Copper busbar, also known as copper busbar or copper busbar, is made of copper material, rectangular cross-section or chamfered (rounded) rectangular long conductor, in the circuit to carry current and connect the role of electrical equipment, in electrical equipment, especially the complete set of power distribution device has been widely used. so, we know how to choose copper row?
1. Generally, the width of the copper bar should be the same as that of the outgoing end of the circuit breaker. The thickness of the busbar can be appropriately reduced on the direct load side to meet the requirements. However, when the branch bus is connected with the circuit breaker, the bus is punched with a round hole for connection. MNS/GCK does not need to be made when entering and leaving the branch, but it must be made when entering and leaving the branch.
2. The selection of high-voltage busbar copper bar mainly refers to a data, thermal stability, that is, the need to meet the short-term withstand current.
The choice of low-voltage busbar is based on the rated current calculated by the transformer. For example, for a 1000KVA transformer, we first calculate the current on its low-voltage side: 1443A. Next, the bus current-carrying table can be directly checked. It can be seen from the current-carrying table that 80*8 copper bars can meet the requirements.
4, the choice of copper, but also need to consider the dispersion coefficient. The dispersion coefficient is to consider the subsequent load and will not be used at the same time. The more loops, the smaller the dispersion coefficient.
5. The contact surface between the copper bar and the electrical components shall be smooth and clean, and the edge and orifice of the connecting piece shall be free of burrs and unevenness. The copper bar shall be free of cracks and serious wrinkling after bending, the wrinkle height shall not be greater than 1mm, and the bending radius shall not be less than 2 times of that after bending. Under the premise of no cracking and serious wrinkling after bending, the bending radius is allowed to be equal to the thickness of the bus bar.
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