Electricity usage and application scope of closed bus duct

[Abstract] Electricity usage and application scope of closed bus duct
At present, most of the old information network complex buildings use centralized power supply. Generally, the power computer room is located on the first floor, while the information load is upstairs. The distance between the power computer room and the information load is too large, and a huge number of DC cables are used in the information computer room.
In order to avoid factors such as excessive cable laying and difficulty in coordination, it is recommended to use a one-time method to transmit DC power from the power machine room to the load machine room.The use of closed bus ducts in the DC power supply system of the computer room is an option that can effectively reduce the amount of cables used. It has the characteristics of strong heat dissipation, environmental protection, and flexible wiring. It has practical application significance in complex buildings with centralized power supply mode. .At present, this solution has been increasingly used in operator equipment rooms.
Bus duct is commonly used in the AC power supply system of high-rise buildings. The bus duct is a bus system composed of metal plates (steel plates or aluminum-magnesium alloy plates) as protective shells, conductive bars, insulating materials and related accessories.According to the insulation method, bus duct can be divided into three types: air bus duct, densely insulated bus duct and high-strength bus duct.
By analyzing the successful application cases of bus ducts in AC systems, operators choose densely insulated bus ducts as the transmission medium for electric energy in DC power supply systems, which can transport electric energy to the load side more reliably and safely.
The closed busbar is produced in complete sets by the factory, with guaranteed quality, small operation and maintenance workload, and easy construction and installation.In addition, the shell of the densely insulated bus duct adopts multi-point grounding, so that the shell is basically in equipotential grounding mode, which greatly simplifies the structure and eliminates the risk of personal electric shock.
Generally, the DC power supply system consists of AC panel, rectifier panel and DC panel.After adopting closed bus duct, the conventional DC power supply system needs to be adjusted: install one or two large-capacity DC split screens in the switch room, and set up a large loop output in the DC split screen; install a busbar in the DC power supply system of the power machine room Joint screen, its function is dedicated bus output, and there is no output loop in the cabinet; a closed bus duct is used to connect the DC split screen and the bus joint screen; the DC head cabinets in the switch room are powered by the DC branch in the machine room. Screen.

Application scope of high-strength closed bus duct
High-strength closed busbars are specially designed for power transmission and distribution systems with AC three-phase four-wire, three-phase five-wire system, frequency 50~60Hz, rated voltage up to 660V, and rated operating current 200~6300A.
Copper busbar structural features
The busbar casing is assembled with roll-formed profiles, and the conductive bars adopt economical current density so that they can withstand strong electric stress and thermal stress. According to the data, it passed the dynamic thermal stability test, and the busbar showed no detectable permanent deformation after the test.
The conductive busbars are covered with multiple layers of insulating materials and can withstand a power frequency withstand voltage of 3750V.The breakdown and flashover phenomenon lasted 1 minute.
When the ambient air temperature is 20±5℃ and the relative humidity is 50~70%, the insulation resistance of each section is not less than 20MΩ.
When the busway passes rated current for a long time, the temperature rise of its conductive parts does not exceed the value listed in the table.
The bus duct adopts a high-strength fully enclosed structure, and the protection level can reach IP54.
The number of plug-and-pull times between the bus duct plug-in box and the bus duct shall not be less than 200 times.
When the bus duct passes the rated current for a long time, the temperature rise of its conductive parts shall not exceed the values ​​listed in the table.