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Anonymous users2024-02-06Stress tube: electrical stress control is to control the electric field distribution and electric field strength inside the cable accessories, that is, to take appropriate measures to make the electric field distribution and electric field strength in the best state, so as to improve the reliability and service life of the cable accessories. For the cable termination, the electric field distortion is the most serious, and the biggest impact on the reliability of the terminal operation is the cable outer shield cut-off, and the influence of the electric field distortion of the cable intermediate joint, in addition to the cable outer shield cut-off, there is also the cable end insulation cut-off.
Heat shrinkable tube: The material composition of heat shrinkable stress tube is made of a variety of polymer materials blended or copolymerized, the general base material is polar polymer, and then high dielectric constant filler is added. The heat shrinkable stress tube in the cable accessories is mainly used to alleviate the effect of dispersing electrical stress.
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Anonymous users2024-02-05In order to make the cable run reliably, it is very important to make the stress tube in the cable head, which is to achieve the effect of dispersing the electrical stress on the basis of not destroying the main insulation layer.
There is a grounded (copper) shield outside each phase core of the high-voltage cable, and a radially distributed electric field is formed between the conductive core and the shield. In other words, the electric field of a normal cable is only the power line from the (copper) wire along the radius to the (copper) shield, and there is no electric field (power line) in the axial direction of the core, and the electric field distribution is uniform.
When making the cable head, the shielding layer is removed, and the original electric field distribution of the cable is changed, which will produce a tangential electric field (power line along the axial direction of the conductor), which is extremely unfavorable to insulation. The power lines stripped of the shield core are concentrated at the fracture of the shield. Then the part where the cable is most likely to break down is the fracture of the shield.
At the fracture of the shield layer that is most likely to break down of the cable, we take the power line (electrical stress) in this concentration, and use the electric stress control tube (referred to as the stress tube) made of materials with a dielectric constant of 20 30 and a volume resistivity of 108 1012 cm, and put it at the fracture of the shield layer to disperse the electric field stress (power line) at the fracture to ensure that the cable can operate reliably.
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Anonymous users2024-02-04Actually, the principle is the same, but the material is different.
After expansion, the support is removed and shrunk on the cable when used. But the stress tube, as the name suggests, needs to play the role of a stress tube, which is produced with conductive glue. The sheath tube mainly plays a protective role and is made of insulating materials.
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Anonymous users2024-02-03No, the stress tube is generally black, about ten centimeters long. The general installation location is at the junction of the main insulation and the semi-conductive layer.
The stress tube is one of the cable accessories products, and the stress tube is generally black, about ten centimeters long. The general installation location is at the junction of the main insulation and the semi-conductive layer. The material composition of the heat shrinkable stress tube is composed of a variety of polymer materials blended or copolymerized, the general base material is polar polymer, and then high dielectric constant filler is added.
It is mainly used to alleviate the effect of dispersing electrical stress, and to balance the electric field at the cable cut-off, so that the electric field will not break through the insulating sleeve. For cables, in addition to the outer shield cut off of the cable, the electric field distortion at the end of the cable insulation cut off is the most serious, which affects the reliability of terminal operation, that is, appropriate measures are taken to control the electrical stress. Electrical stress control is to control the electric field distribution and electric field strength inside the cable accessories, so that the electric field distribution and electric field strength are in the best state, so as to improve the reliability and service life of the cable accessories.
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Anonymous users2024-02-02Relieves stress on joint bolts.
Direct burial is to bury the pipeline directly into the soil after anti-corrosion, the pipe ditch is to use bricks or concrete to pour a square trench, the bottom of the concrete, the top cover of the prefabricated plate, there is a pass, semi-pass ditch, etc., when installing the pipeline to do support, the pipe ditch is easy to maintain, the cost is high, and multiple pipelines can be installed.
That's a big difference.
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