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[Deadbreak T Connector] The Role Of Stress Cone

[Deadbreak T Connector] The Role Of Stress Cone


In the production of the cable terminal, because the metal sheath and the insulation are blocked, the electric field gradient originally distributed uniformly in the cable is damaged, and the power lines will gather at the shielding break of the outer semi-conductive layer, where the electric field strength is most dispersed Non-uniform, field strength ***. In the simplest case, breakdown occurs because the cross section of the conductor connection is increased. The thickness, dielectric constant of the additional insulation and the insulation of the cable body are unequal, and the electric field in the cable terminal and the center head is dispersed Compared with the cable itself, a larger change occurs. This change is mainly manifested in the axial electric field strength along the cable insulation surface direction, perhaps called axial stress.

 

The axial electric field is particularly strong at the disconnection of the metal sheath and the connection of the core. Perhaps the axial stress is particularly concentrated. Therefore, to properly improve the electric field dispersion at the disconnection of the metal sheath and the connection of the core, it is necessary to Pay attention to the joint planning with satisfaction. Imagine that the shielding layer is artificially extended for processing, that is, the insulating tape and the conductive metal material are wrapped into a cone, which is called a "stress cone".

 

In the terminal head, the stress cone mainly extends the outer shielding port of the cable with semi-conductive data, and the method of changing its shape to improve the uneven distribution of the electric field strength to reach the traveling dielectric strength and reduce the electric field strength, uniform electric field the purpose.

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