Fire resistant and fire-resistant insulated busbar trunking

Fire resistant and fire-resistant insulated busbar trunking

Product IntroductionThe fire-resistant busbar trunking consists of an outer shell coated with fire-resistant paint, busbars wrapped with fire-resistant mica tape, and brackets made of fire-resistant insulation materials. There are multiple grooves on the bracket, in which busbars are embedded and fixed. There is a bus duct connection box at one end of the bus duct, and a bus tap box inside the bus duct. Fire resistant busbar trunking has excellent insulation performance, which can be used continuously in normal environments or for more than one hour in fire environments. It can be used in high-rise buildings and important facilities to replace fire-resistant cables for power transmission and distribution.Fire resistant busbar trunking is suitable for transmission and distribution systems with rated voltage below 690V, rated working current of 250-5000A, and frequency of 50-60Hz. After years of testing and industrial operation, its electrical performance, fire resistance, and metal structure have all reached a certain level. When the busbar system is operated at rated current for a long time, its temperature rise shall not exceed: connection terminal: 60K, metal shell: 30K, insulation surface inside the slot: 40K.

How to use fire-resistant busbars and fire-resistant cables reasonably? As fire-resistant cables or fire-resistant busbars are not only used as emergency power lines in case of power grid or line problems, but also as transmission lines in case of fire or other disasters, fire-resistant busbars must be able to ensure normal power transmission at high temperatures. When the ambient temperature reaches 700 ℃ or above, they can also ensure power supply operation for more than 1.5 hours without causing internal insulation reduction and short circuit between lines due to the increase in ambient temperature. When the current transmission on the line is not very high and the space for laying cables is limited with many bends, using fire-resistant cables is more suitable. However, when the current transmission on the line is relatively high, multiple fire-resistant cables are required, which makes construction and future operation and maintenance inconvenient. When the capacity of the line transmission is large, fire-resistant busbars are generally used. Currently, the capacity of the line transmission is relatively large.

Technical Features

1. It can heat the air to a very high temperature, up to 850 ℃, while the shell temperature is only around 50 ℃.

2. High efficiency: up to 0.9 or above.

3. Air type busbar trunking has clean air and small volume.

4. Multiple types of air electric heaters can be designed according to user needs.

5. Air type bus ducts are durable and have a service life of several decades, provided that they do not violate usage regulations.

6. The heating and cooling rate block can reach 10 ℃/S, with fast and stable adjustment. It will not cause temperature control drift due to the phenomenon of controlled air temperature leading or lagging, making it very suitable for automatic control.

7. Good mechanical performance: Because the heating element of the air type bus duct is made of specially made alloy material, it has better mechanical performance and strength than any heating element under the impact of high-pressure air flow. This is suitable for systems and accessory tests that require long-term continuous heating of the air

Fire resistant and fire-resistant insulated busbar trunkingThe starting busbar trunking provides direct connections to low-voltage distribution cabinets, transformer low-voltage sides, starting inlet boxes, and other distribution equipment. The fire-resistant busbar trunking is equipped with a set of joint components for each elbow. The basement fire-resistant busbar trunking is made of copper aluminum composite conductors. The busbar trunking is vertically installed to ensure full use concealment. When the vertical installation height of each floor of a high-rise building is greater than 4m, spring brackets must be added to support the load of the busbar trunking itself. The vertical shaft fire-resistant busbar trunking and vertical adjustment. When adjacent busbar trunking have plug-in boxes at the same height, to ensure easy insertion and removal of plug-in boxes, there should be an appropriate distance between the busbar trunking.

When installing the busbar horizontally, the fire-resistant busbar trunking of commercial housing can be installed and laid by lifting or supporting the busbar trunking with nails along the wall, and the distance between the busbar trunking and the side wall surface should be ensured, so that the plug can be smoothly inserted into the busbar trunking. The protection level of the shell reaches IP68, and it can be immersed in water for a long time, and can resist the fierce spray of fire on it;
Adopt overall vacuum casting to ensure that there are no gaps in the bus duct;
Using insulation materials, toxic gases will not be emitted even in flames, ensuring the safety of personnel;
Using special thermal conductive materials, it has good heat dissipation function in normal working environment.

This product has electrical performance equivalent to other types of bus ducts under normal conditions. Please refer to the technical parameters and current rating of FH fireproof bus ducts for ordering. The installation structure is the same as other bus ducts, please refer to the selection.

use

1. It is necessary to verify that the phase sequence of the busbar trunking is correct, and the insulation resistance of the busbar trunking is not less than 20M Ω2. Ensure that the busbar trunking is not invaded by liquids or solids3. It is necessary to confirm that the installation bracket is stable and the connecting bolts are reliably connected4. Contact with live equipment components is dangerous!5. When the bus duct starts to transmit power, it must not carry a load6. Check that the total load current does not exceed the main bus current or design currentBus duct connectors refer to differential circuits composed of all branch currents except for bus tie switches and section switches. The small difference of a certain section of busbar refers to the differential circuit composed of all the branches connected to the busbar, including the busbar and section switches, and the current. The large difference ratio differential of the busbar is used to distinguish between defects inside and outside the busbar area, while the small difference ratio differential is used for selecting defective busbars.

Attention should be paid to the welding of bus ducts

For the use of bus ducts, everyone already knows a lot about bus ducts, so I won't go into too much detail. For the production workshop bus ducts, what I want to introduce to you below is about the welding of bus ducts.

1. Copper bar welding. After welding the busbar, its current carrying capacity is much smaller compared to the original busbar with the same cross-section. Therefore, we need to weld the busbar with a 45 ° inclined surface, which can increase the welding surface and improve its current carrying capacity.

2. Welding of cover plate and side plate. Usually, the side panels are more cost-effective to weld on the outside, while the cover panels are welded on the inside. At the same time, after the cover and side panels are welded and formed, they need to be polished smooth.

3. Whether it's copper bars or shells. We need to use fixtures to fix the welded object during welding, so as to ensure the correctness of the welding angle.