Knowledge related to dense busbars
Release Time:
Dec 17,2021
Dense busbar trunking consists of a fire-retardant paint-coated casing, busbars wrapped with fire-retardant mica tape, and a support made of fire-retardant insulating material. The support has multiple grooves, which embed and secure the busbars. A busbar trunking connector box is located at one end of the dense busbar trunking, and another inside the trunking. The dense busbar trunking has excellent insulation performance and can be used continuously under normal conditions and for more than 1 hour in the event of a fire. It can be used in high-rise buildings and important facilities to replace fire-resistant cables for power transmission and distribution. Dense busbar trunking is 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.
High-density busbar trunking consists of a fire-retardant paint-coated shell, busbars wrapped with fire-resistant mica tape, and a support made of fire-resistant insulating material. The support has multiple grooves that embed and secure the busbars. One end of the high-density busbar trunking has a busbar junction box, and there is a busbar junction box inside the busbar trunking. The high-density busbar trunking has excellent insulation performance and can be used continuously under normal conditions and in case of firefor 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.
High-density busbar trunking is suitable for rated voltagebelow 690V, rated operating current 250-5000A, and 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.
High-density busbar trunking structural performance:
1. Using a reasonable "sandwich" phase wire close-stacking structure design, the high-density busbar trunking is compact, small in size, has low busbar system impedance, low voltage, and good dynamic thermal stability.
2. The shell is made of cold-bent thin steel. The side plates on both sides adopt a double-layer hollow structure, which can effectively prevent high-temperature gas or open flames from directly entering the dense busbar trunking through the tight hollow. The surface of the busbar shell is galvanized and sprayed with fire-retardant paint. In case of fire, the paint can rapidly expand at a geometric rate on the surface of the busbar, forming a dense carbonized heat insulation layer. The busbar shell seals all gaps to prevent high temperatures from directly entering the busbar.
3. The joints use special fire-resistant insulating components, which are reliable and easy to connect.
Main technical parameters of high-density busbar trunking:
1. Using a "sandwich" sealed 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 applied to the busbar system for a long time, the temperature rise does not exceed: terminal: 60K, metal shell: 30K, surface of insulation inside the trunking: 40K.
4. After a fire occurs, when the combustion temperature rises to 960 degrees Celsius, the high-density busbar trunking system can still maintain normal operation.
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