In modern power transmission and transformation construction, as the main conductor connecting power station transformers, the advantages of dense bus ducts are becoming increasingly prominent and widely used.

1、 Classified by structure

10KV dense busbar trunkingAccording to structure, it can be divided into two categories:

1. Air type busbar trunking: A busbar trunking formed by insulating the busbars with air and then using a metal shell to protect the busbars and their insulators as a whole. Air type bus ducts rely on air convection for heat dissipation, so the heat dissipation effect is poor, making them suitable for small-sized current supply.

2. Dense busbar trunking: A busbar trunking formed by tightly integrating each busbar wrapped in solid insulation material and protected by a metal shell. Due to the fact that dense bus ducts rely on conduction for heat dissipation, the heat dissipation effect is greatly improved compared to air insulated bus ducts, making them suitable for large-scale current supply.

2、 Classified by purpose

Bus ducts are mainly divided into three categories according to their usage in different places:

1. Ordinary bus duct: A non flame retardant and non fire-resistant bus duct used for ordinary load distribution. When a fire occurs during a short circuit, it will continue to burn to other connected busbars, which can easily cause a fire accident.

2. Flame retardant bus duct: In the event of a fire, the flame of this section of the bus will not spread and burnAnother paragraphThe bus duct. The coating of the metal shell of the bus duct and the insulation material of the bus must be flame-retardant.

3. Fire resistant bus duct: a bus duct that can maintain circuit integrity within a specified time under flame conditions. The insulation material for fire-resistant bus ducts is usually non combustible, but flame retardant materials are also used. Fire resistant busbar trunking can be classified into air insulated fire-resistant busbar trunking and dense insulated fire-resistant busbar trunking according to insulation structure.

3、 Classified by insulation method

10KV dense busbar trunkingAccording to the insulation method, it can be divided into:

1. Air type spliced busbar trunking: Due to the use of copper sheets to connect the joints between busbars, in humid weather in the south, the joints are prone to oxidation, resulting in poor contact between the joints and busbars and easy heating of the contacts. Therefore, it is rarely used in the south. At the same time, the joint size is too large, the horizontal bus segment size is inconsistent, and the appearance is not aesthetically pleasing. In addition, its moisture-proof and heat dissipation effect is poor. In terms of moisture-proof, the busbar is prone to moisture and water leakage during construction, resulting in a decrease in phase to phase insulation resistance. Due to the small air gap between the busbars, when a large current flows through the busbars, a strong electromotive force is generated, causing the magnetic oscillation frequency to form a superimposed state, resulting in excessive noise.

Dense insulation splicing bus duct (or dense insulation plug-in bus duct): Due to the limitation of the shell plate, only horizontal sections not exceeding 3m can be produced. Due to the small air gap between the busbars, a strong electric force is generated when the busbars pass through high currents, causing the magnetic oscillation frequency to form a superimposed state and resulting in excessive noise.

2. High strength spliced bus duct (or high-strength plug-in bus duct): The manufacturing process is not limited by the sheet metal, and the shell is made in the form of a tile groove, which increases the mechanical strength of the bus. Due to the use of tile grooves in the shell, the busbar is intentionally separated and fixed in the pit groove position. The ventilation between the lines is good, and the moisture-proof and heat dissipation function of the busbar groove is significantly improved, making it more suitable for the southern climate. Due to the certain gap between the wires, the temperature rise of the wires is reduced, the overload capacity is improved, and the magnetic oscillation noise is reduced. But the stray current and inductance generated by it are much larger than those of dense bus ducts, so when compared with the same specifications, the cross-section of its conductive bus duct should be larger than that of dense insulated plug-in bus ducts.

There are various classification methods for dense bus ducts, and different product types exist under different classification methods. When choosing, it should be based on the specific application scenarioConsidering the requirements comprehensively, choose the type of bus duct.