The common box closed bus includes the non-phase isolated common box closed bus, the phase isolation common box closed bus and the AC and DC excitation common box bus, which are used for the current transmission between the generator lead line below 100MW and the low-voltage side of the main transformer or between the low-voltage side of the transformer and the high-voltage distribution device of the unit of 75MW and above, and the common box closed bus can also be used for the AC and DC excitation circuit of the generator, the power supply of the substation and the power supply lead of the bus or other industrial and civil equipment.
2. Features
The conductor of the common box closed bus is made of copper-aluminum busbar or slotted aluminum slot, with compact copper structure, convenient operation and maintenance, small workload, and IP54 protection level, which can basically eliminate the grounding problems caused by external moisture, dust and foreign objects.
The shell is made of aluminum plate, with outstanding anti-corrosion function, and avoids the additional eddy current loss caused by the steel shell, the shell is electrically connected and grounded at multiple points, eliminating the danger of personal electric shock, and does not need to set up a fence, simplifying the requirements for civil engineering, according to user needs, it can be set with heat shrinkable sleeves on the busbar, and heaters and respirators are installed in the box to strengthen the insulation
The scope of use of the split-phase shut-off bus in large power plants is: starting from the generator outlet terminal, to the main circuit bus of the low-voltage side of the main transformer, and the independent way-asking bus leads out to the branch lines of the factory high-voltage transformer and voltage transformer, lightning arrester and other equipment cabinets.
The split-phase shut-off bus is mainly used for large-scale generator sets, and the intention of using the split-phase shut-off bus in the outgoing circuit of generators of 200MW and above is:
(1) Reduce grounding problems and avoid interphase short circuits. The short-circuit current at the outlet of the large-capacity generator is very large, which brings great difficulties to the production of the circuit breaker, and the generator cannot withstand the impact of the outlet short-circuit. Due to the maintenance of the shell, the closed bus can basically eliminate external moisture. Grounding problems caused by dust and foreign objects improve the continuity of generator operation. The bus demand is closed in phase, and the occurrence of interphase short circuit is basically eliminated.
(2) Eliminate the heating of the steel structure. The leakage of the high-current bus bar causes eddy currents and circulation of the surrounding steel structure and steel bars under electromagnetic induction, resulting in high heating temperature, large loss, and structural strength. Closing the busbar and choosing shell shielding can fundamentally deal with the problem of induced heating of the steel structure.
(3) Reduce the interphase short-circuit electric power. When a large short-circuit current flows through the busbar, the short-circuit electrical force of the interphase conductor is greatly affected by the shielding effect of the shell.
(4) After the bus is closed, it is possible to choose the micro positive pressure operation mode to avoid the condensation of the insulator, improve the safety and reliability of the operation, and invent the conditions for the bus to choose the ventilation and cooling mode.
(5) The closed bus bar is produced by the factory in a complete set, the quality is relatively good, the operation and maintenance workload is small, the construction device is simple, and there is no need to set up the fence, which simplifies the structure and simplifies the requirements for the civil structure.
|
More on that
|
Phase of the busway in the low-voltage incoming line – Wiener
According to the requirements of the relevant specifications, the placement of the three-phase busbar can be roughly divided into two kinds according to the model of the low-voltage distribution cabinet and the different manufacturers: horizontal placement and placement of the down wire, according to the order of placement.
|
|
Difference Between Fuse and Circuit Breaker – Vernal
The principle of the fuse is to use the current to flow through the conductor to heat the conductor, and the conductor is ablated after reaching the melting point of the conductor, so the electrical appliances and circuits used for circuit maintenance are not burned out. It is an accumulation of heat, so it is also able to complete overload maintenance. Once...
|
|
How to solve the fault of the busway
If there is a problem in the bus duct of the double bus wiring, it is necessary to pay attention to the operation mode of bus maintenance in the process of dealing with the problem, and if necessary, the bus maintenance should be stopped for a short time. After the bus voltage disappears, the dispatcher should immediately swing the switch (including the bus tie switch) that may call, and notify the operation team to ...
|
|
Busbar system reverse operation – Wiener
(1) For the charging of the spare bus, when there is a bus tie circuit breaker, the bus tie circuit breaker should be used to charge the spare bus. At this time, the maintenance device of the bus tie circuit breaker should be fully invested, and the relevant maintenance value and time limit should be changed to a small size, so that when there is a problem with the bus, the bus tie circuit breaker can be quickly tripped, cut off...
|
|
Temperature rise requirements and safety of Wiener busway
With the rapid development of our economy and technology, the trend of urbanization is becoming more and more popular, and people's electricity consumption is also increasing. In this case, the busway has developed significantly, and the use of instead of cable has become the development trend of the times. Therefore, what are the requirements for the temperature rise of the busway and ...
|
|
A brief introduction to the classification of busway - Wiener
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 a plug-in closed bus with plug-in junction boxes at intervals, or as a feed-in type without a junction box in the center ...
|
|
Bus load forecasting method and characteristics - Wiener
Bus load guessing is a kind of power system load guessing, and the bus system load can be defined as the sum of the terminal load supplied by the main transformer of the substation to a relatively small power supply area, which is the refinement of the system load. Bus load guessing generally only carries out short-term load guessing, and the result is ...
|
|
The advantage of closed busbar over open busbar is Wiener
1) Closing the bus duct can reduce the grounding fault, prevent the short circuit between the phases, and fundamentally eliminate the grounding fault caused by external moisture, dust and foreign objects, and improve the continuity of generator operation.
2) Eliminate the surrounding ...
|
|
Precautions for installation of Wiener busway
1. Before the bus duct installation, it should be ensured that the electrical shaft, substation and distribution room, the decoration project of the place through which the bus duct passes, and the heating and ventilation project are all completed to ensure that the bus duct is not polluted. The reserved holes and embedded parts of the floor and wall should be embedded and reserved according to the position required by the design. The functions of the busway are single ...
|
|
Structural characteristics of high-voltage busway - Vernal
If you understand the scope of application of the busway, you can see that the excellent effect of the busway has the upper hand, which has a lot to do with the structural features. Therefore, if you want to have more confidence with the bus duct, you still need to understand it from the structural characteristics. At a time when China's economy is developing rapidly, ...
|
|
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 ...
|
|
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.
|
|
There are several main ways to wiring the Wiener bus
Bus line refers to a product made of copper (copper bar) and aluminum material with high conductivity to transmit electrical energy and have the ability to collect and distribute electricity. The main conductor used by the power station or substation to transmit electrical energy. Through it, the output of the generator, transformer or rectifier ...
|
|
Use and characteristics of AC busbar systems – Wiener
The communication and connection skills of the independent power supply system create better prospects for the power supply of the future. Hundreds of systems around the world have installed SMA's Sunny Island battery inverters to supply power to customers for a long time. The stackability of Sunny Island, i.e. multiple Sunny Islands ...
|
|
Difference Between Grounding Electrode and Grounding Busbar – Vernal
The grounding electrode is a discharge channel that connects current or voltage to the earth, and in order to reduce the grounding resistance, the electrodes that form the grounding grid are generally used in groups.
The grounding bus refers to the connecting wire that connects the current or voltage to the grounding grid, or the conductor that connects the grounding electrode into one.
...
|
|
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
QUADRON®185Power Fuse Isolation ...
|
|
Vernal fuse core Siemens fuse alternative
Due to the long delivery time of the Wiener melt core, whether the Wiener fuse can be replaced by Siemens' fuse, the answer is yes, so it is recommended to use Siemens' Rong Xin, which corresponds to the following
3NA38012C NH-Fuse NH-,00(0 ...
|
|
Wiener is a common way to wiring busbars
Single bus wiring method: all outgoing wires are connected to the same busbar, which is also the most cost-effective and simplest wiring method
Single bus segmentation: The outgoing line is arranged in two parts on different sections of the single busbar, so that a power failure in the meantime does not affect the power supply of the other bus
...
|
|
The service life of the lighting power busway – 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 is effectively improved, the contact between the copper strip and the inner wall of the tube is reduced, the insulation resistance and anti-aging ability of the tube body are strengthened, and then the service life of the tube body is extended. The longevity of the tube far exceeds ...
|
|
Operating regulations for the use of busbars - Wiener
1. Charging to the bus should be carried out with a switch (bus tie, bypass or line switch) with snap-action maintenance that reflects various types of faults. Before charging the bus, it should be considered whether the system may be unstable if the charging bus trips, and if necessary, the active power flow of the relevant line can be reduced. ...
|
|
Contact
working hours
