At present, most of the old information network
comprehensive buildings adopt centralized power supply. Generally, the power
equipment room is set on the first floor, while the information loads are on
the upper floors. The distance between the power equipment room and the
information loads is too large, and a large number of DC cables are used in the
information equipment room.
To avoid factors such as excessive cable laying and
difficult coordination, it is recommended to adopt a one-time method to
transmit the DC power from the power equipment room to the load equipment room
side. Using enclosed bus ducts in the DC power supply system of the equipment
room is a choice that can effectively reduce the use of cables. It has the
characteristics of strong heat dissipation capacity, environmentally friendly
products, and flexible wiring, and has practical application significance in
comprehensive buildings with a centralized power supply mode. At present, this
solution has been increasingly applied in the operator's equipment room.
Bus ducts are commonly used in the AC power supply
systems of high-rise buildings. A bus duct is a bus system composed of a metal
plate (steel plate or aluminum-magnesium alloy plate) as the protective shell,
conductive busbars, insulating materials, and related accessories. According to
the insulation method, bus ducts can be divided into three types: air-type bus
ducts, dense insulation bus ducts, and high-strength bus ducts.
By analyzing the successful application cases of bus
ducts in AC systems, operators choose dense insulation bus ducts as the power
transmission medium in the DC power supply system, which can transmit
electrical energy more reliably and safely to the load side.
Enclosed bus ducts are produced in a complete set by
the factory, with guaranteed quality, small operation and maintenance workload,
and simple construction and installation. In addition, the shell of the dense
insulation bus duct adopts multi-point grounding, making the shell basically in
an equipotential grounding mode, greatly simplifying the structure and
eliminating the risk of electric shock to personnel.
Generally, the DC power supply system is composed of
an AC panel, a rectifier panel, and a DC panel. After using the enclosed bus
duct, the conventional DC power supply system needs to be adjusted: install one
or two large-capacity DC distribution panels in the switching equipment room,
and set large-loop outputs in the DC distribution panels; install a bus tie
panel in the DC power supply system of the power equipment room, and its
function is for dedicated bus output, and no output loop is set in the cabinet;
use the enclosed bus duct to connect the DC distribution panel and the bus tie
panel; the DC header cabinets in the switching equipment room obtain power from
the DC distribution panels in their own equipment rooms.
