Busbar and cable applications

The use of plug-in busway for cable and busway applications has the following benefits:

1. The busbar slot is convenient for tapping: The so-called plug-in busbar slot is used to connect the power supply of the trunk line to the branch line. Therefore, tapping is very convenient.

The disadvantage of the prefabricated branch cable is that it is to be customized to the factory; the branch connection method uses an open “C”-type hoop. Can it be tightened for a long time? In addition, the price of each branch head is very expensive, so the application of prefabricated branch cables is still not widely used. Any one floor needs to cut off the power supply, and the busway does not need to be powered off. Just remove the plug-in box from the busway under no-load condition. However, it is very dangerous to cut off the branch power of the prefabricated branch cable and operate it with live power.

2. The busway has strong overload capacity: the busway has strong overload capacity, depending on the working temperature of the insulation material it uses. The insulation material used in the busway is over-stretched and the working temperature is 105°C. The working temperature is now 140. Radiation cross-linked flame-retardant tape (PER) and radiation cross-linked polyhydrocarbon heat shrinkable tube above °C. The insulating material used in the cable is normally operating at 95°C and 105°C, so the overload capacity of the busbar is far greater than that of the cable.

3, Busway can prevent overload fire: August 27, 2000, the disaster-prone Russia's Moscow Ostankino TV Tower - the world's second tallest building in Europe lit up the sky. The reason is caused by the overload of the cable; the shutdown of three converters in Baosteel is also caused by the cable misfire.

The insulation layer and jacket of ordinary cables will burn, and the flame-retardant cables will also burn under the flame. Only after the flames leave, they will not burn, and the fire-resistant cables will not burn, but the price is expensive. Only fire-fighting and other power sources that are not allowed to power off are used for fire resistance. cable.

The busway housing is made of steel and will not burn. Even if the insulation of the copper row burns, the flame will not get out of the busway.

4. The heat dissipation performance of the busway is good: The insulation material of the cable (insulation of the core and the insulation of the sheath) is both insulating material and thermal insulation material. Therefore, when the power cable is laid in the bridge, it is allowed to lay up to two layers. The reason for this is considered to be heat dissipation. .

The busway uses air to conduct heat and dissipates heat through tightly contacted steel casings, so its thermal performance is comparable to that of cables, and cable thermal performance is evident.

5. The busway is easy to maintain: The busway needs little maintenance. The daily maintenance is usually to measure the temperature rise of the shell and the core bolt and the temperature rise of the junction box. If the core bolt is 4.8, it needs to be tightened regularly. If you use 8.8 high-strength bolts do not have to be regularly sturdy.