What are the classifications of busbar trunking systems?
Release time:
2022-02-12
Source:
Depending on the application, busbar trunking systems typically consist of a starting busbar slot, straight busbar slots (without partitioned or tapped outlets), L-shaped vertical (or horizontal) curved busbars, Z-shaped vertical (or horizontal) offset busbars, T-shaped vertical (or horizontal) three-way busbars, X-shaped vertical (or horizontal) four-way busbars, variable-capacity busbar trunking, expansion busbar trunking, end caps, terminal junction boxes, tap-off units, as well as related accessories and fastening devices for the busbar trunking system.
Busbar trunking What is the classification?
Depending on the application, busbar trunking systems typically consist of a starting busbar tap, straight busbar sections (without partitioned or tapped outlets), L-shaped vertical (or horizontal) curved busbars, Z-shaped vertical (or horizontal) offset busbars, T-shaped vertical (or horizontal) three-way busbars, X-shaped vertical (or horizontal) four-way busbars, variable-capacity busbar trunking, expansion busbar trunking, end caps, terminal junction boxes, tap-off units, and various associated accessories and fastening devices.
Busbar trunking Depending on the insulation method, they can be classified into air-insulated plug-in busbar slots, high-density insulated plug-in busbar slots, and high-strength plug-in busbar slots.
Air-plug busbar connector (BMC). Because the connections between busbars are made of copper and the humid southern climate promotes oxidation at the joints, resulting in poor contact between the connectors and the busbars and overheating of the contacts, this type of connector is rarely used in southern regions. In addition, the connectors are bulky, the dimensions of the horizontal busbar sections do not match, and the overall appearance is unattractive.
High-density insulated plug busbar socket (CMC). Poor moisture-proof and cooling performance. In terms of moisture resistance, during construction, moisture and water can easily penetrate the busbar, thereby reducing its insulation resistance. Heat dissipation in the busbar primarily relies on the enclosure; however, due to the close spacing between conductors, heat dissipation from phases L2 and L3 is slow, leading to a significant temperature rise in the busbar socket. Dense insulated plugs Busbar trunking This limitation applies only to the outer-shell panels, which can produce horizontal sections no longer than 3 meters. Due to the narrow air gap between adjacent bus bodies, when high currents flow through the buses, strong electromagnetic forces are generated, leading to overlapping natural vibration frequencies and excessive noise.
High-intensity closed busway (CFW). Its manufacturing process is not constrained by sheet-metal thickness; the enclosure is formed into a corrugated, vaulted shape, which enhances the mechanical strength of the busway and allows for the production of horizontal sections up to 13 meters in length. Because the enclosure is constructed with corrugated grooves, the busbar positions are deliberately staggered, creating an 18-mm gap between adjacent busbars. This design ensures excellent ventilation between circuits, significantly improving the moisture-proofing and cooling performance of the busway and making it better suited to southern climates. The spacing between conductors also helps regulate temperature fluctuations, thereby increasing overload capacity and reducing self-induced vibration noise. However, this configuration generates much larger stray currents and induced resistance than those of compact busways; consequently, the cross-sectional area of the conductors must be larger than that of compact insulated plug-in busways to meet the specified performance requirements.
The plug-in busway is a trunking system that boasts advantages such as compact size, streamlined structure, reliable operation, high current-carrying capacity, convenient power distribution and feeder allocation, easy maintenance, low energy consumption, and excellent dynamic thermal stability. It is widely used in high-rise buildings.
The primary advantage of busbar trunking systems is their significantly longer service life compared with cables, typically ranging from 30 to 50 years. To maximize the service life of the busbar trunking, the selection and design of its supporting brackets are critical considerations. When the busbar trunking is installed on a horizontal plane, mounting brackets or gantry supports are generally used; for vertical installations, a combination of spring-mounted brackets and angle-steel brackets is commonly employed. When purchasing high-capacity busbar trunking systems, it is essential to carefully inspect the materials used for the bracket suspension rods and main beams, as well as the springs and load-bearing capacity. Some unscrupulous manufacturers opt for lower-grade angle steel as bracket material, which can lead to sagging and displacement of the busbar trunking over time. If such issues are not addressed promptly, they may result in safety accidents.
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