33kV cable termination

QuickField simulation example

This is an example of the cable termination simulation, performed with QuickField software.

Engineering question answered by this example
How to find electric field stress in MV cable terminations?

Download simulation files (files may be viewed using any QuickField Edition).

Physics used in this example
Transient electric.

Geometry
Axisymmetric problem.
Cable dimensions are taken from [1]
Cable termination dimensions are taken from [2]

Given
AC frequency f=50 Hz, conductor potential V = 33 kV (r.m.s.).
Screen potential - 0 V (grounded).
XLPE permittivity 2.5, sheath permittivity 2.3
Insulation materials electrical conductivity 1e-15 S/m.
Stress control tube features nonlinear electrical conductivity [3]:

Task
Calculate the electric field stress distribution.

Solution
To represent the electric potential sine wave we use the equation: V*sqrt(2) * cos(360° * f * t)

Results
Maximal electric stress is 13 kV/mm.
33kV cable termination electric stress

References:
[1] 33 kV single core cable.
[2] Cable Jointing Instruction: 33kV Cable Termination Single Core.
[3] Du, B. X., Li, Z. L., & Yang, Z. R. (2016). Field-dependent conductivity and space charge behavior of silicone rubber/SiC composites. IEEE Transactions on Dielectrics and Electrical Insulation, 23(5), 3108–3116.

Typical applications
medium-voltage cable accessories design
insulation stress grading
cable termination optimization