Selection guide for insulation heat shrink sleeve of Busbar heat shrink sleeve

 

The insulation protection effect of Busbar heat shrink tubing depends on whether the selection of insulation heat shrink tubing is scientifically reasonable. As the main power supply line of the distribution and power supply device, the busbar includes two types: copper busbar and aluminum busbar. It is mainly used for connecting the main switch and each branch switch in the electrical cabinet. Its insulation treatment is directly related to the safe operation of the power system. As the core protective component of Busbar with heat shrink insulation, the insulation heat shrink sleeve is mainly used to prevent short circuits caused by small animal overlap, prevent chemical substances from corroding the busbar, and avoid the risk of electric shock for maintenance personnel. At the same time, it adapts to the development needs of miniaturization of switchgear and solves the problem of insulation between busbars. Therefore, it is crucial to master the correct selection method.

 

 

Busbar heat shrink sleeve is a heat shrinkable tubular protective sleeve made of specially made polyolefin. The choice of material directly determines the insulation performance, shrinkage effect, and service life of the casing. It is necessary to prioritize the use of polyolefin materials that are suitable for the working conditions of the busbar, ensuring that they have good thermal shrinkage, insulation, and corrosion resistance, and can tightly cover the surface of the Heat shrink insulated busbar, forming a stable insulation protective layer to meet the long-term operation needs of the heat shrink tubing insulated busbar.

The specification selection of high-voltage PE heat shrink tube insulated busbar should be based on core parameters such as busbar size, rated current, and voltage level, while following the standard selection steps to ensure compatibility and safety. In terms of matching the size of the busbar with the rated current, there are universal standards in the industry that can be referred to (each enterprise can adjust according to its own current carrying capacity standard).

 

Taking copper busbar as an example, the rated current 125A is selected as 15 × 3 specification, 200A is selected as 20 × 3 specification, 400A is selected as 30 × 4 specification, 630A is selected as 40 × 6 or 50 × 5 specification, 800A is selected as 40 × 10 or 50 × 8 specification, 1000A is selected as 60 × 8 specification, 1600A is selected as 100 × 8 specification, 2000A is selected as 100 × 10 specification, 2500A is selected as 100 × 8 double row, 3000A is selected as 100 × 10 double row, 3500A is selected as 120 × 10 double row, 4000A is selected as 120 × 10 triple row; The Heat shrink tube polyolefin busbar on the knife switch is selected with specifications of 40 × 5 for 600 knives, 60 × 8 for 1000 knives, 80 × 10 for 1500 knives, and 100 × 10 for 2000 knives.

 

The correct selection steps mainly include 8 points:

 

Firstly, determine the installation position of heat shrink tubing on the busbar according to actual needs;

 

The second is to ensure that the outer shell of the Heat shrink tubing busbars is clean and smooth, without damage or cracks, to avoid affecting the fitting effect of the tubing;

 

The third is to choose a bushing that matches the system voltage level. The commonly used voltage levels are 1kV, 10kV, and 35kV, and it is strictly prohibited to use low-grade bushings in high-voltage scenarios;

 

Fourthly, the specifications should be compatible with the size of the busbar. Under normal circumstances, the inner diameter of the casing should be the same as the width of the busbar. In 1kV products, if the bending angle of the busbar is ≤ 120 ° or it is serrated, the inner diameter of the casing should be 5-10mm larger than the width of the busbar.

 

Fifthly, the casing color should be selected according to the phase sequence of the PVC insulation busbar. Yellow, green, red, and light blue should be used for the A, B, C phases and neutral wire (neutral wire) respectively. It is strictly prohibited to use red or black casing to label the phase sequence with color codes, and blue cannot be used instead of light blue (blue is used to identify the DC negative pole);

 

Sixth, the A, B, and C three-phase down lead busbars should be arranged in standardized positions such as upper, middle, lower, left, middle, right, far, middle, and near according to standard requirements;

 

Seventh, the bolts for fixing the Busbar sleeves insulation should be of appropriate length to ensure that 2-5 nut threads are exposed after tightening;

 

Eighth, when connecting the busbar, the connecting bolts of the horizontally placed busbar should be threaded from bottom to top, and in other cases, the nuts should be placed on the maintenance side for ease of later operation and maintenance.

 

In summary, the selection of Busbar insulating tubing should revolve around the three core principles of "material adaptation, specification matching, and compliance with specifications", combined with practical factors such as busbar material, rated current, voltage level, and installation conditions, scientifically selecting materials, determining specifications, and following selection steps. Only by selecting suitable Customized busbar insulating tube can its insulation and protective effects be fully utilized, ensuring the stable operation of Busbar insulation sheets, avoiding various electrical safety hazards, and adapting to the safe operation and miniaturization development needs of distribution systems.

 

If you have any questions or requirements regarding the selection of heat shrink tubing for Busbar heat shrink sleeves, please feel free to contact us at any time. We will provide professional selection suggestions and technical support based on your actual working conditions, helping you efficiently complete the selection work.