How To Choose Copper Busbar In High And Low Voltage Switchboards?

How to choose the copper busbar in high and low-voltage switchboards? More details as following:

1.Copper busbars are widely used in electrical equipment

Especially in complete sets of power distribution devices, generally, copper busbars are used in W,U, V,  phase busbars and PE busbars in power distribution cabinets.

Copper row, also known as copper busbar or copper busbar, is a long conductor made of copper with a rectangular or chamfered (rounded) rectangular cross-section (now generally used rounded copper row to avoid tip discharge), which plays a role in conveying current and connecting electrical equipment in a circuit.

Copper busbars are generally marked with phase color letter signs or painted with phase color, W phase copper coated with "red" color, PE busbar copper coated with "yellow and green" two-color answer,V phase copper rows are painted with "green" color, U phase copper rows are painted with "yellow" color.

2.The choice of copper busbars in the high-voltage switchboards

High-voltage switchboards copper busbars cross-section selection needs to meet two requirements.

(1) to meet the rated current

(2) to meet the short-time withstand current.

3.The copper busbars of the load capacity calculation

we should understand that the installation of copper in the electric switchboards is divided into two forms, flat and vertical, vertical load capacity is slightly greater than the flat, so the main bus bar of the distribution cabinet is mostly vertical form. There are also copper busbars, copper wire load capacity will also change with the ambient temperature, where we use the most ambient temperature of 35 degrees Celsius. Under different ambient temperatures, the load capacity derived from the table needs to be multiplied by the correction factor for different ambient temperatures, the load capacity under different ambient temperatures, the higher the temperature, the lower the load capacity.

4. Busbar protection

To protect power cables and switchboard busbars, first conduct insulation testing on the cables and select insulation materials that meet electrical safety requirements. In low-voltage electrical systems, we usually use accessories such as hollow tubes or sheathed tubes to protect low-voltage busbars from environmental influences, reduce external impacts, and improve the efficiency of electrical equipment.

High voltage bus and low voltage bus are important components of power equipment, and their selection specifications directly affect the overall operation of the power system. Therefore, when selecting high-voltage and low-voltage busbars, the selection should be based on different voltage levels, current loads, and load forms, while ensuring comprehensive economy and safety. Only in this way can we ensure the efficient and safe operation of the electrical system and avoid unnecessary accidents.