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The busway is composed of a metal shell (steel plate or aluminum plate), conductive bar, insulating material and related accessories.
1. Classification of common bus ducts
1. Classification and characteristics of busway
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2. Busway selection
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The busway interface is relatively susceptible to moisture, and its protection level should be paid attention to when selecting the busway. For different installation sites, bus ducts with different shell protection levels should be selected.
■ In the general indoor normal environment, the bus duct with protection grade IP40 can be selected;
■The fire sprinkler area should be selected with a protection grade of IP54 or IP66 bus duct;
■The busway cannot be directly connected with the equipment with significant shaking and shock vibration, and should be connected by soft joints.
Second, the difference between bus duct and bus bar
1. Different in nature
■Busbar: It is a common passage on which multiple devices are connected in the form of parallel branches.
■Busway: It is a closed metal device composed of copper and aluminum busbars.
2. Uses are different
■Bus: It can be used to transfer data between these computers at will, but only one device can send data at the same time.
■Busway: It is used to distribute large power to each component of the dispersion system. Wires and cables have been increasingly replaced in indoor low-voltage power transmission trunk projects.
3. The characteristics are different
■Busbar: The plug-in bus duct is AC three-phase four-wire or five-wire system, suitable for power distribution with a frequency of 50-60Hz, a rated current of 100A-6300A, and a rated voltage of 690V or less, especially suitable for low-voltage power distribution systems in industrial plants and mines and high-voltage power supply systems for commercial and residential buildings, hotels, hospitals, etc.
■Bus duct: The bus duct is characterized by a series of matching, commercial production, small size, large capacity, short design and construction period, easy assembly and disassembly, no combustion, safe and reliable, and long service life. The busway products are suitable for three-phase four-wire and three-phase five-wire power supply and distribution system engineering with AC 50Hz, rated voltage of 380V and rated cable of 250A-6300A.
3. The difference between air-type busway and dense busway
1. Different insulating mediums: There is a certain gap between the copper bars of the air-type bus duct, that is to say, the insulation between the copper bars mainly depends on air. The insulating medium between the copper bars of the dense busway (also known as the closed busway) is an organic insulating material.
2. The arrangement of the copper bars is different: the copper bars of the air type bus duct should be separated, while the copper bars of the dense bus duct are close together, and there will be no short circuit, because the copper bars are insulated.
3. Different shapes: the air-type busway is generally thick up and down, while the dense busway will become larger at the joint.
4. Different uses: the air-type busway has a better moisture-proof effect and is used in humid environments such as shafts, while the dense busway has a larger current and is used in trunk lines such as liaison busbars.
5. Different heat dissipation: The heat dissipation of the air type bus duct mainly relies on the convection of the air in the groove and the air outside to conduct the heat out, and the heat dissipation efficiency is relatively low, while the heat dissipation (shell) of the dense bus duct is directly connected to the bus bar, so the heat dissipation effect is better than that of the air type.
6. The price is not the same: the price of the intensive type is slightly higher than the price of the air type.
7. Different protection levels: The protection level of dense bus ducts is high, generally up to IP68.
8. Different installation environment: due to the large overall volume of the air-type busway, the installation space required will be much larger, while the dense busway is very slim.
9. The installation efficiency is not the same: the busway of the same capacity, the dense busway is small in size, and the installation is convenient and fast;
10. Safety is different: If the air type busway is accidental, foreign objects will fall into the groove and affect the normal operation, while the dense type does not have this worry, because it is fully enclosed.
11. Chimney effect: If the air busway is exposed to fire, it will produce a chimney effect, while the dense type will not.
12. Lineup coefficient: The lineup coefficient needs to be considered when the air-type busway is installed vertically or obliquely, and the incorrect position will affect the air circulation and heat dissipation, while the dense busway is not affected by this.
13. Different losses: air type bus ducts will have heat loss because of the influence of temperature changes (high temperature resistance), and closed bus ducts will have low losses due to low temperature.
Fourth, the price factors and calculation methods that affect the bus duct
There are several factors that affect the price of busway:
1. The calculation of copper bar, first of all, is to figure out how many wires it is. Then according to the size of the specification, to determine the specifications of the copper bar, and then calculate the volume of the copper bar (the calculation of the volume is the length of a single copper bar * the section of the copper bar * the number of copper bars), and the volume is calculated and multiplied by the unit price of the copper bar, which is the price of the copper bar.
2. Auxiliary materials: shell, insulating film, phase spacer, etc. The material of the bus duct shell is ordinary carbon steel, aluminum-magnesium alloy, high-strength pultrusion, etc., the ordinary carbon steel shell can be based on the volume of the shell * the price of the plate, and the thickness of the plate of the carbon steel shell is generally about 1.5mm~2.5mm according to the size of the bus duct. All enclosures also need to take into account the price factor of the surface treatment.
3. Processing fee: The price varies depending on the region.
4. Process level
5. Brand added value: big brands are inevitably accompanied by high added value, and the product process can also correspond to them.
Conventional low-voltage enclosed busway price calculation formula:
■Current level * 1.4 ~ 1.9 = unit price of one meter bus duct.
■Formula for calculating the price of copper bars:
Width * thickness * 0.0089 * copper price = unit price of copper bar.
For example: 1250A low-voltage closed bus duct, the price of one meter is: 1250 * 1.5 = 1875 yuan.
Fifth, the bus duct part of the manufacturer's quotation
For more material price information, please pay attention to the WeChat public account of Cost Pass
For more material price information, please pay attention to the WeChat public account of Cost Pass
For more material price information, please pay attention to the WeChat public account of Cost Pass
Data source | Cost pass
For more material price information, please pay attention to the WeChat public account of Cost Pass
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