Dense plug-in bus ducts with small size, high strength, and high current rating are commonly used in high-rise buildings, multi story industrial plants, factory substations, and other places. Their technical functions comply with the requirements of GB7251-97 and IEC439.2 specifications.

Functional Unit Code:

A four-way busbar

S starting busbar

Z terminal busbar

LSL type horizontal joint

LCL pen direct head

TST type horizontal joint

TCT type pen direct head

P expansion joint

BY variable capacity connector

BX adjustment connector

SC+type pen direct head

ZSZ type horizontal joint

ZCZ type pen direct head

SH inlet box at the beginning

Planning features of air insulated closed bus duct:

(1) Single bolt clamping terminal

The bus duct planning adopts advanced single bolt clamping terminals as the connecting components of the bus duct units. Due to its special structure, it can avoid erroneous operation during installation. By tightening one bolt at a time, two bus duct units can be reliably and quickly connected.

(⑵) High protection level socket

A safety protection shield is planned at the socket, which can only be inserted into the plug-in box when the shield is opened. When the socket is not in use, the protective shield can be pulled and closed with lead to prevent dust and foreign objects from entering the socket. This improves the protection function of the bus duct, avoids misoperation, and greatly enhances safety.

Explanation of busbar trunking product types, structure, and technical parameters

(3) Number of shell (protective shell) levels

The primary plan is for 5 current levels, and only 3 levels of enclosures have been selected. In this way, when the system changes capacity according to adjacent levels, there is no need to replace the shell. For example, when 400A changes to 630A, the shell size is the same. Therefore, it greatly facilitates the installation.

(4) Large transmission of electrical energy

The planning of this type of bus duct is air insulated, which improves the heat dissipation of the bus duct, reduces impedance, and achieves the function of bus transmission.

(5) Good completeness

There are various functional connection units that can meet the needs of most power transmission and distribution projects.

2A high-strength closed bus duct

Bus duct products - High strength closed bus duct

Product features and usage:

High strength closed type busbar trunking in air type and dense type busbars

On the basis of the line, improvements have been made to the planning of the external structure. Selecting a molding machine to form it with good support strength has solved the problem of large-span inability to support lifting.

Structural features and skill parameters

Structural features:

1. The outer shell of the bus duct is made of cold pressed track aluminum alloy profiles, which are easy to assemble and have a beautiful appearance.

2. Choose a separate air insulation type, whose net spacing between phases and between phases and ground is much greater than the standard requirements, making it extremely safe and reliable.

3. The internal insulation components are made of high-strength epoxy resin material, which improves the resistance and thermal stability of the bus duct.

4. The joint adopts a docking connection method, and dual connection copper bars are used together, effectively increasing the touch area of the joint, and the device is convenient and easy to install.

3. Primary skill parameters

The functions of the busbar trunking comply with IEC439-2 and GB7251.2-1997.

The 2-bus duct can ensure long-term normal operation under additional current and 110% additional voltage.

Under normal conditions of ambient air temperature of 20 ± 5 ℃ and relative humidity of 50-70%, the insulation resistance of each section of the busbar duct shall not be less than 20MQ2.

The 4 bus ducts can withstand 3750V power frequency withstand voltage without breakdown or flashover for 1 minute.

The number of insertions and removals between the plug-in box and the bus duct shall not be less than 200 times.

The protection level of busbar trunking can reach IP66.

1、 Applicable scale

Close the new busbar in the shared box. Suitable for communication in a power supply system with a frequency of 50-60Hz, a voltage of 3.6KV, and an additional current of 400-6300A.

2、 Structural features and skill parameters

1. Fundamental structure:

2.Explanation of busbar trunking product types, structure, and technical parameters:

1. This series of bus ducts has excellent short-circuit resistance function, as it is protected by an aluminum (or weak magnetic steel plate) shell, which can effectively weaken eddy currents or rings

The structural heating caused by the flow reduces the temperature of the bus duct casing, minimizes electrical energy loss, increases current carrying capacity, and reduces electric power.

2. This series of bus ducts has an advanced structure, and the device maintenance holes can be arbitrarily set at the upper or lower part of the bus duct. Regarding the high current indoor bus duct in the shell

Ventilation louvers are installed on both sides and the lower part to enhance heat dissipation and reduce temperature rise.

3. Using two layers of insulation and multi-point connection grounding of the shell significantly reduces maintenance workload and improves safety function.

4. Choose corrugated tube elastic joints, with a simple device that can adjust two degrees of freedom in both horizontal and vertical directions, not only satisfying different temperature drops and thermal expansions

The elastic requirements caused by cold shrinkage can also compensate for errors caused by foundation settlement, addressing the shortcomings of traditional skateboard type elastic devices such as poor protection level, cumbersome installation, and unreliable operation.

5. In order to deal with the negative impact of the shock caused by the operation of transformers, generators, and distribution cabinets on the bus duct, soft materials are selected outside of their connection with the bus duct

Connecting or copper braided tape, adding rubber pads between the shells to reduce the sensation; Regarding the busbar trunking body, shock absorbers are installed in the system to provide elastic support for the porcelain bottles and conductive bars, effectively avoiding mechanical shock and seismic wave damage to the closed busbar caused by the shell.

6. The heat transfer of the bus duct mainly relies on thermal radiation. In order to make good use of thermal radiation, light gray paint is sprayed on the outer surface of the bus duct to reduce visible damage

Absorption of light; Spray black paint on the inner and outer surfaces of the bus duct to enhance the radiation of internal heat to the shell and prevent corona discharge.

7. In order to avoid occasional condensation caused by temperature changes in the outdoor and indoor areas during winter, wall sleeves are installed at the penetration points to connect the outdoor and indoor bus ducts

*Isolation: When installed straight, the flange is inside, and when installed horizontally, the flange is outside.

8. In order to improve the agreed operating temperature rise of the busbar trunking and avoid electrolytic corrosion of the joints in coastal open air and severe electrochemical corrosion atmosphere, the connection should be lowered

Contact resistance, all joints are treated with silver plating, allowing the temperature rise of the joints to increase to 65K, significantly higher than the temperature rise during normal operation.

9. In order to avoid the resonance frequency scale of the bus duct's natural frequency (the resonance frequency scale of a single bus is 35-135Hz), and to

Used for reducing the electric force on the busbar, reasonably determining the span between insulators, and selecting the type, specification, and strength level of insulators.

10. In order to monitor the temperature of detachable joints, sealed observation windows are installed at the connection outlets between transformers, generators, distribution cabinets, and bus ducts,

Directly measure temperature through temperature display patches or far-infrared temperature measurement devices to monitor the operation of the busbar system.

11. For the convenience of users, current transformers can be installed at the generator outlet and the primary side of the excitation transformer according to their needs, which is convenient for users

Detect current.

3. Primary skill parameters

1. Insulation resistance: The insulation resistance value of each busbar trunking unit should be greater than or equal to 1000MQ2500V megohmmeter.

2. Dielectric strength: Each section of bus duct undergoes a 1-minute power frequency withstand voltage test before leaving the factory. The values of power frequency withstand voltage and lightning impulse withstand voltage are shown in the table

3. Grounding System: Complies with the requirements of IEC364-5-54 for grounding systems.

4. Protection level: Indoor type: IP40; Field type: IP43, IP54.

5. Load function: Under additional current, the temperature rise of the casing meets the requirements of GB763-90 "Heating during Long term Operation of High Voltage Electrical Appliances".

6. Short circuit function: The dynamic and thermal stability test conforms to the requirements of GB2706-89 "Test Method for Dynamic and Thermal Stability of Communication High Voltage Electrical Appliances".