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Main >> Applications >> Sample problems >> 33 kV cable termination

33kV cable termination

QuickField simulation example

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

Problem Type
Axisymmetric problem of transient electric analysis.

Geometry
Cable dimensions are taken from [1]
Cable termination dimensions are taken from [2]
33kV cable termination Calculate electric field stress distribution Conductor Insulation screen Red tape GND Insulation Screen Sheath Stress control tube Insulation tube Cable lug 50 mm 30 mm 350 mm

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

Electric field stress in the stress control tube
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.