A brief introduction to low-voltage busbars
Release Time:
Aug 31,2021
Low-voltage busbars consist of a fire-retardant paint-coated shell, busbars wrapped with fire-retardant mica tape, and a support made of fire-retardant insulating material. The support has multiple grooves that embed and secure the busbars. A busbar connection box is located at one end of the low-voltage busbar, and another is inside the busbar. The low-voltage busbar has excellent insulation performance and can be used continuously under normal conditions and for more than 1 hour in case of fire. It can be used in high-rise buildings and important facilities to replace fire-resistant cables for power transmission and distribution. Low-voltage busbars are suitable for power transmission and distribution systems with a rated voltage below 690V, a rated operating current of 250-5000A, and a frequency of 50-60Hz.
The low voltage busbar consists of a fire-retardant paint-coated shell, busbars wrapped with fire-retardant mica tape, and a support made of fire-retardant insulating material. The support has multiple grooves, into which the busbars are embedded and fixed. There is a busbar junction box at one end of the low voltage busbar, and another inside the busbar. The low voltage busbar has excellent insulation performance and can be used continuously under normal circumstances and during fires.More than 1 hour. It can be used in high-rise buildings and important facilities to replace fire-resistant cables for power transmission and distribution.
Low voltage busbars are suitable for rated voltagebelow 690V, rated operating current 250-5000A, frequency 50-60Hz power transmission and distribution systems. After years of testing and industrial operation, its electrical performance, fire resistance, and metal structure have reached an advanced level.
Low Voltage Busbar Structural Performance:
1. It adopts a reasonable "sandwich" phase line close-stacking structural design, the busbar is compact, small in size, the busbar system impedance is low, the voltage drop is reduced, and the dynamic and thermal stability is good.
2. The shell is made of cold-bent thin steel. The two side plates are double-layer hollow structures, which can effectively prevent high-temperature gas or open flames from directly entering the busbar through the tight hollow structure. The surface of the busbar shell is galvanized and sprayed with fire-retardant paint (when encountering fire, the paint can rapidly expand on the surface of the busbar at a geometric rate, forming a dense carbonized heat-insulating layer, sealing all gaps in the busbar shell and preventing high temperatures from directly entering the busbar).
3. The joint uses special fire-resistant insulating components, which are reliable and easy to connect.
Main Technical Parameters of Low Voltage Busbar:
1. It adopts a "sandwich" sealing structure.
2. The busbar system can withstand a 3750V power frequency withstand voltage without breakdown or flashover within 1 minute.
3. When the rated current is passed through the busbar system for a long time, the temperature rise does not exceed: terminal: 60K, metal shell: 30K, internal insulation surface: 40K.
4. After a fire, when the combustion temperature rises to 960 degrees Celsius, the low voltage busbar system can still maintain normal operation.
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