Three phase four wire fire-resistant busbar trunking

Three phase four wire fire-resistant busbar trunkingUnder the same current carrying capacity, copper material can be saved by 10-35%, and electricity loss can be reduced by more than 15%. The bus duct carries a large amount of current on weekdays, which facilitates the connection of feeders and reduces energy consumption. It is very suitable for AC power supply and can maintain long-term operation at a given voltage value. Under the condition of alternating current within one minute, the bus duct will not be broken down and will not have a flashover state. Compared with cables, bus ducts have the following characteristics: bus ducts are flat conductors, which have better heat dissipation, lower impedance, and higher current carrying capacity compared to round conductor cables or pre branched cables. Bus ducts are used from the 630KVA transformer to the incoming cabinet. In order to ensure the safety and reliability of power supply and reduce the occurrence of faults, especially in secondary hotels, large commercial buildings, high-rise and super high-rise comprehensive buildings, the power supply and distribution systems of multi story industrial plants, large exhibition centers, hotels, commercial buildings, supermarkets, etc

This type of bus duct is available in two types: three-phase four wire or three-phase five wire. It has the characteristics of quick installation, easy use, safety and reliability, and is suitable for power supply in places such as automobile manufacturing rooms, large shopping malls, exhibition halls, sports halls, airports, and high-rise buildings.

The production of bus ducts follows relevant IEC standards and combines the advantages of air and dense bus ducts. It can withstand strong electrical forces and has good heat dissipation performance In terms of the structural design of the shell, a new type of corrugated shell has been adopted to increase its support strength. The space with a column spacing of 6m can be left unsupported, and the skewness does not exceed 15mm, solving the problem of large spans without support

The difficulty of legal support In the insulation treatment of conductive edges, in addition to using polytetrafluoroethylene film, silicone gel (radiation cross-linked polyethylene polymer material) insulation is also used, which has insulation, flame retardant, moisture-proof, sealing, anti-corrosion and other functions

The FH type fire-resistant insulated busbar trunking produced by our factory complies with the IEC439-2 standard, as well as the JB8511-1996 air insulated busbar trunking departmental standard and the GB/T9978-88 building component fire resistance test standard.
2. FH type fire-resistant insulated bus duct is used with a rated voltage of 660V or below and a frequency of 50Hz or 60Hz.
3. The FH type fire-resistant insulated bus duct has a test voltage of 1000V and an insulation resistance of over 10M Ω within 30 minutes of ignition. At 60 minutes of ignition, the insulation resistance is 0.5 Ω and the test voltage is above 1000V.
4. FH type fire-resistant insulated bus duct adopts double row bolt connection, with extremely stable performance, easy installation, and shell protection level meeting the requirements of IP40.
5. Heating curve diagram for fire resistance test: The shell is composed of a mixture of cold drawn thin steel profiles. The two side panels are our company's double-layer hollow structure. Effectively preventing high-temperature gases or open flames from directly entering the interior of the busbar through a sealed hollow structure. The surface of the busbar shell is galvanized and sprayed with fireproof coating (when exposed to fire, the coating can quickly expand at a geometric speed on the surface of the busbar to form a dense carbonized insulation layer. Seal all gaps in the busbar shell to prevent high temperatures from directly entering the interior of the busbar).

The joint adopts fire-resistant insulation components, which are reliable and convenient to connect.

Three phase four wire fire-resistant busbar trunking

Selection of busbar trunking and calculation of technical parameters

The selection of busbar trunking is usually considered comprehensively from the following aspects: fire safety requirements, insulation materials should be flame retardant and have good heat resistance, do not release toxic gases at high temperatures, and structurally prevent chimney effects. Dense insulated busbar trunking should be preferred, such as air insulated type and 3200 busbar trunking,It is necessary to install fire-resistant partitions in each unit of the online slot shell; For particularly important places, fire-resistant troughs should be selected to ensure the maintenance of emergency power supply in case of fire.

As for the installation site, the first consideration is the protection level of the slot shell, followed by the influence of the building structure on the shape, installation bracket form, and span of the trunking. For indoor workplaces such as large capacity substations, IP30 rated bus ducts can be used to improve their heat dissipation effect; For ordinary indoor work, such as electrical shafts and distribution rooms on floors, to ensure safety, bus ducts with a rating not lower than IP40 should be selected; For indoor damp places or places with splash proof requirements, in order to ensure that they can still work normally in the event of splashing, bus ducts with a rating not lower than IP54 should be selected; For outdoor or special requirements such as anti spray, anti wave, and anti-corrosion places, resin insulated bus ducts can be used separately

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.

The wet operations such as plastering and spraying of civil engineering have been completed at the location where the bus duct installation passes through. The building decoration works, such as ceiling, doors and windows, painting and other interior operations, as well as heating, sanitation and ventilation, have been basically completed. Only after confirming that the finishing construction will not affect the installed bus, can the bus be installed. There is no hazardous medium in the installation site, and there is no gas or dust (including conductive dust) in the medium that can corrode metals and damage insulation. No items are allowed to be stacked near it, and doors and windows are complete. The bus duct is sealed and waterproof, moisture-proof, anti-theft and other technical measures are taken. The size and strength of the reserved holes and embedded parts meet the design requirements. The electrical equipment (transformers, switchgear, etc.) has been installed and inspected as qualified. Construction process flow line measurement → Equipment point inspection → Support fabrication and installation → Installation of enclosed plug-in busbar → Grounding inspection, insulation test, voltage withstand test → Trial operation acceptance line measurement

parameter
1. Working voltage: AC380V ± 10% 50Hz; Power consumption: 5KW
2. Furnace pressure measurement range: 0-100Pa Measurement accuracy:
3. Air flow rate: 0-50m3/min Measurement accuracy: ≤± 0.5 m3/min
4. Combustion gas source: propane, liquefied gas
5. Gas tank capacity: 50kg × 4
6. Test temperature: Program heating for 60 minutes, room temperature -925 ℃, 120 minutes
7. Room temperature -1050 ℃ 180min Room temperature -1115 ℃ 240min
8. Room temperature -1150 ℃
9. Furnace temperature: ± 15 ℃
10. Internal temperature of the specimen: ± 10 ℃
11. Test piece backfire temperature: ± 4 ℃
12. Temperature sensor:
13. Furnace: 6 armored nickel chromium nickel silicon K-value thermocouples Accuracy level: Level II
14. Back fire: 6 armored nickel chromium nickel silicon K-value thermocouples Accuracy level: Level II
15. Timing range: 0-360min Timing accuracy: 16. Sample horizontal * large combustion length: 2.4m
Power cable busbar duct flame retardant testing machine specimen vertical combustion length: 1.6m
Equipment dimensions: length x width x height (3 x 2 x 2.5) m;
Equipment weight: approximately 4000 Kg, installed on site.