Busway (referred to as busway) is a busbar system composed of metal plates (steel plates or aluminum plates) to protect the shell, conductive bars, insulating materials and related accessories. It can be made into plug-in closed busbars with plug-in junction boxes at intervals, or as fed enclosed busbars without junction boxes in the center. In the power supply system of high-rise buildings, the power and lighting lines are often separated, and the bus duct is installed as the main power supply line in the electrical shaft along the wall one or more times.
classify
According to the use, a bus duct is generally composed of the beginning bus duct, straight bus duct (with jack and without jack), L-shaped straight (horizontal) bending bus, Z-type straight (horizontal) offset bus, T-type straight (horizontal) tee bus, X-type straight (horizontal) four-way bus, variable capacity bus duct, expansion bus duct, terminal head, terminal junction box, plug-in box, bus duct related accessories and fastening devices. According to the insulation method, the busway can be divided into three types: air-type plug-in busway, densely insulated plug-in busway and high-strength plug-in busway.
Busway air-plugged busway (BMC). Because the joints between the busbars are softly connected with copper sheets, in the humid weather in the south, oxidation simply occurs between the joints, which constitutes poor contact between the joints and the busbar, so that the contacts are simply heated, so it is rarely used in the south. Moreover, the volume between the joints is too large, the size of the horizontal bus segment is inconsistent, and the appearance is not beautiful.
Densely insulated plugged busway (CMC). Its moisture-proof and heat dissipation effects are poor. In terms of moisture-proof, during the construction of the busbar, it is simply subject to moisture and water seepage, resulting in a decrease in the insulation resistance between phases. The heat dissipation of the bus mainly depends on the shell, because the wires are compactly arranged and installed between the lines, the heat energy of L2 and L3 phases is dissipated slowly, and the temperature rise of the bus duct is high. The densely insulated plug-in busway is limited by the shell plate, and can only produce a horizontal section of no more than 3m. Because the air gap between the phases of the bus is small, when the bus passes through a large current, a strong electrodynamic force occurs, which makes the magnetic vibration frequency form a superimposed state, resulting in excessive noise.
High-strength enclosed busway (CFW). Its process manufacturing is not limited by the plate, and the shell is made into a tile groove method, so that the mechanical strength of the bus bar increases, and the horizontal section of the bus bar can be produced up to 13m long. Because the shell is made into a tile ditch method, the position of the pit ditch intentionally separates and fixes the busbar, there is a distance of 18mm between the busbars, and the ventilation between the lines is good, so that the moisture-proof and heat dissipation functions of the bus duct have been significantly improved, and they are more accustomed to the southern climate; Because there is a certain gap between the wires, the temperature rise of the wire drops, which improves the overload capacity and reduces the magnetic vibration noise. However, the stray current and inductive reactance generated by it are much larger than those of the densely packed busway, so when comparing with the same specifications, its conductive cross-section must be larger than that of the densely insulated plug-in busway.
The plug-in bus duct is a trunk system, which has the advantages of small size, compact structure, reliable operation, large transmission current, convenient tap feeding, convenient protection, low energy consumption, good dynamic and thermal stability, etc., and has been widely used in high-rise buildings.
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Ferromagnetic resonance occurs in the busbar system – Vernal
The ferromagnetic resonance of the bus system is divided into parallel ferromagnetic resonance and series ferromagnetic resonance. Parallel ferromagnetic resonance refers to the resonance of the ground capacitance of the bus system and the nonlinear inductance of the bus electromagnetic voltage transformer (primary neutral grounding) in the neutral point ungrounded system or small current grounding system.
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Wiener's built-in current transformer
Thanks to the precisely developed housing size, current transformers can now be integrated into all major products in a very space-saving way, such as:
QUADRON®185Power Speed disconnector fuse set
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The advantages of low-voltage closed busbar system without punching connections
1. Save space. The components are attached to the busbar, which can save 1/3 of the size of the box transformer.
2. Operation**. The busbars are placed behind the components, and the upper and lower plates can be sealed to prevent touch protection.
3. Improve the stability and reliability of operation, improve the dynamic and thermal stability, and the bus bar is not perforated.
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Example of the application of the Wiener busbar system
The motor control cabinet uses the Wiener bus system, and the copper bus is used as both a hooking element and a conductive element; The incoming molded case circuit breaker is connected to the copper bar through a special bus adapter, and all the motor maintenance switches and contactors are hooked on the bus adapter in an orderly manner.
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Uses and characteristics of busbar systems – Wienal
The bus system is a system with standardized bus distance, which is used in low-voltage power supply and distribution switchgear and control equipment, so that the bus can play the effect of conducting electricity and supporting electrical components.
The system is divided into 40, 60, 100 and 185mm ...
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The Wiener bus is a Siemens 3 VA1 and 3 VA2 adapter
Wiener has developed a new series of 3 VA1 circuit breakers equipped with ® busbar adapters from Siemens in the 160 system with a compact range of 30.
The safety articulation of the circuit breaker is the internal right of the tension spring device base and high-performance rails.
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Lighting power busway service life - Wienal
The system consists of a current box, a bus body, a branch plug and device accessories.
When the heat dissipation of conductive copper strip has been effectively improved, the contact between the copper strip and the inner wall of the tube is reduced, and the insulation resistance and anti-aging ability of the tube body are strengthened, so as to prolong the service life of the pipe body. The life of the tube far exceeds ...
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The role of plug-in busway – Wiener
Generally speaking, plug-in busway is mainly used for power transmission. We know that all conductors will have losses, and the losses caused by the flow of electricity through conductors are larger and some are smaller. For example, compared with the aluminum wire with the same wire diameter and the copper wire, the loss of aluminum is larger, and the loss of copper is smaller. That is, the conductivity ...
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Some of the Wiener series models
05802 Insulator with female thread, bolt, M8, height 35mm
08824 Platen connector for PE- and N-busbar 01 932
08825 Snap-on fastener, for PE- and N-busbars 01126-01129 and 019 ...
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Busway installation method - Wiener
1. Busway horizontal device, the interval between the two brackets is ≯2500mm, and the interval between straight devices is ≯3600mm;
2. When the device bracket is straight, it should be drilled with the channel side plate and fastened with M6-M8 bolts.
3. In the process of installation construction, priority should be given to the power supply system, ...
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Advantages of Wiener aluminum busway
1. Reliable insulation method
There is an insulating layer on the conductive row, and there is a certain air yard between the phase and the phase, and there is an insulating pad block limited by DMC data between the conductive row and the shell, triple insulation, to ensure that the insulation of the bus duct is full of certainty, especially in the humid environment.
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Uses and characteristics of detached closed busbar - Wiener
Closing busbars include out-of-phase shut-off buss, co-box (including co-box phase isolation) shut-off busbars and cable busbars, which are used for power plants, substations, industrial and civil power supply leads.
Phase-off busbar
1. Usefulness
Out of phase ...
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Wiener plug-in busway features
The plug-in busway has a high overload capacity
The overload capacity of the bus duct is strong, depending on the high working temperature of the insulation material it uses, and the working temperature of 105C is selected for the insulation material used in the bus duct, and the radiation cross-linked flame retardant winding tape with a working temperature of more than 140 °C has been developed ( ...
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Busbar wiring problems of busbars - Vernal
Bus, transformer, generator set unit wiring. It has the characteristics of simple wiring, less switchgear, easy operation, suitable for expansion, and because there is no generator outlet voltage bus, the short-circuit current of the low-voltage side of the generator and the main transformer is reduced.
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The difference between air-type busway and dense busway - Vernal
1. The insulating medium is different: there is a certain open space between the copper bars of the air bus duct, that is to say, the insulation between the copper bars mainly depends on air, and the insulation medium between the copper bars of the dense bus duct (many people call it a closed bus duct) is an organic insulating material.
2. Copper bar placement ...
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The Wiener bus system is reliable
The bus refers to the connection of voltage distribution devices at all levels in the substation, as well as the connection of electrical equipment such as transformers and corresponding distribution devices. The role of the busbar is to gather, distribute and transmit electrical energy.
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Differences and differences between busway and other busbars
The busbar and busway are actually one open and one closed, and the other is not closed. The closed busway is referred to as the busway, that is, the busway is sealed
The closure of the busbar, the closure of the busbar and the busway all refer to the same east...
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What is the role of the busbar in the distribution box
Busbar refers to a product made of copper and aluminum materials with high conductivity to transmit electrical energy and have the ability to gather and distribute electricity. The main conductor used by the power station or substation to transport electrical energy. In the power system, the busbar in the distribution box connects the various current-carrying branch circuits in the distribution unit, ...
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Use and characteristics of AC busbar systems – Wiener
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Low-voltage cabinet for capacitance compensation – Wienal
Capacitor compensation is indispensable in low-voltage cabinets, so what is the effect of capacitor compensation. The meaning of this is that it acts as a capacitor. Let's take a look at the principle of capacitor compensation first, when the capacitor is compensated, the capacitor and the load are connected in parallel, and the capacitor is like a bin. When the load increases, the power supply has internal resistance, so that ...
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