1. Selection of qualified products of regular enterprises:
The busway must be a product with the 3C necessary certification mark and style test report. China's busway factories are uneven, and most of the production methods are handicraft, mainly in well-off areas. When purchasing, it is necessary to conduct an in-depth investigation of the production scale, technical strength, worker quality, and production environment, especially the production environment. This is because if you insulate an unclean space, there will be conductive particles in the insulation. It doesn't matter at the beginning of operation, but over time, the insulation will be damaged.
2. Pay attention to the conductor information of the bus duct:
At present, there are three main types: copper bar, aluminum bar, and copper-aluminum composite, and the price varies greatly. In addition to purity, it is also necessary to pay attention to the mechanical properties after the twists and turns of the data. Here we will focus on copper-aluminum composite materials. The strength of the copper-aluminum composite interface directly affects the processing performance and reliability. The more important performance parameters of copper-aluminum composite buses. 90 twists and turns, no foam, no significant orange peel, no delamination of copper and aluminum. It can be used in electrical equipment to meet the low requirements of interface bonding strength. The interfacial bonding strength is different depending on the manufacturing process. Applying mechanical pressure to bind copper and aluminum together only activates the interfacial atoms, forming atomic bonds. After heat treatment diffusion, the point bond becomes a surface bond, but the diffusion depth is smaller. The interfacial bonding strength is not high. Processing and fusing copper and aluminum under specific process conditions can form a composite layer with uniform interface bonding and constant thickness, and obtain higher interface bonding strength.
3. Selection of bus duct section:
In general, the bus section should be selected according to the large long-term operation current. In addition, the short-term thermal stability and dynamic stability of the bus slots are checked after the larger short-circuit cable. When multiple conductors are close to each other, the bus groove heats up during the current passage due to factors such as the resistance of the conductor and the measurement effect of communication. Copper and aluminum bare buses promise a heating temperature of 70 when running for a long time, but if the contact surface is stably tinned (such as ultrasonic tinning, etc.), the temperature will be increased to 85, and continuous heating is promised. Due to temperature constraints, the busbars with different profiles and cross-sections provide appropriate long-term current values. When selecting the bus cross-section, the actual long-term working current of the bus duct should be less than the long-term promised current value of the bus bar of the selected cross-section. If the average load of the year is large and the bus slot is long (such as the bus slot of outdoor power distribution device), the bus slot is generally selected according to the economic current density method. Economic current density is the amount of current that passes through the unit cross-sectional area of a bus slot when the bus slots of the bus slots and auxiliary equipment are lost and annual maintenance and depreciation expenses are low. The economic current density is divided by the long-term operating current (excluding overload) to obtain the bus cross-section. The busway cross-section selected by the economic current density method is generally larger than the busway cross-section selected by the long-term operation current.
4. The limit temperature of the bus duct fuel tank increases:
What is the extreme temperature rise in busway? The extreme temperature rise of the bus slot is the temperature rise of the bus slot after the higher temperature minus the ambient temperature when the bus slot is running at full load and the rated current is passed. It is generally indicated by k. The temperature rise limit test is carried out during the planning of the bus. The rise in temperature constrains the current carrying capacity of the bus. As the temperature rises, the life of the bus is shortened, the power loss increases, and the voltage drops. It will also affect the ambient temperature and speed up the insulation of peripheral equipment. Aging can even cause safety accidents.
5. Select the bus duct according to the flow rate:
Selecting the right bus product according to the planning process can prevent waste and reduce costs.
6. Select the bus duct according to the application environment and device method:
When selecting a busway, it is necessary to consider the use of the environment. The protection level of the bus slot must meet the following requirements: 1. IP30 or above in indoor special cleaning places. 2. General indoor places use IPI IP40 or above. 3. For indoor places with splash-proof requirements, please use IP54 or above. 4. Indoor humid places or places with waterproof requirements, use IP65 or above. 5. Places with anti-corrosion requirements or outdoor, IP68 fully enclosed resin is poured into the bus trough.
According to the device method, attention should also be paid to the selection of bus slots. If the bus slot is horizontal and the bracket can be set up as required, the bus slot with a length of about 3 meters must be used. If the bracket spacing is greater than 6 meters, long bus slots must be used. Rectangular bus slots must be used when installing bus slots along the plane in construction of different shapes. When installing along the curved surface, it is advisable to pour resin into the bus trough or cylindrical bus duct. When the bus is straightened, a tight insulation or resin casting bus should be used, and the insulation data should be used at a long-term operating temperature of more than 130. In order to avoid the chimney effect, when selecting an air-insulated bus slot, a fire barrier must be set between the various units within the bus recess housing.
When used for emergency power supply, fire-resistant and waterproof bus duct should be used.
7. Pay attention to the busway device bracket:
Compared with cables, the advantage of the busway system is that it has a longer lifespan, which generally takes about 30-50 years. In order to maximize the service life of the busway, the brackets on the bus must also be considered. When the busway device is on the horizontal plane, the lifting bracket or the gantry bracket is generally used, and the shaft generally uses the tension spring bracket and the angle iron bracket. When purchasing a high-capacity bus, the information of the support arm and girder, tension springs, loads, etc., should be carefully checked, and some illegal manufacturers should use the angle iron with a lower number as the support information. As a result, the busway sags and moves after a period of use. If it is not repaired in time, it may cause safety incidents.
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