TElec3: Stress control tube for cable termination

Stress control tube is used to reduce electric stress at cable termination.

Problem Type:

An axisymmetric problem of Transient electric field.


Stress control tube


Relative permittivity of air ε = 1.
Relative permittivity of insulation ε = 2.
Relative permittivity of shield ε = 1.2.
Relative permittivity of stress control tube - nonlinear.
Voltage U = 4 kV.


Calculate the effect of electric stress reduction.


With stress control tube the maximal electric stress reduces from 1.6 to 0.5 kV/mm.

electric field strength distribution along the cable surface

cable electric stress

See the Telec3.pbm problem in the Examples folder.