Cable termination to oil filled bushing - QuickField simulation example
Electric field stress in a cable termination connected to an oil-filled bushing, showing stress reduction from the stress cone and semiconducting deflector.
How to calculate the reduction in electric stress from a stress cone and semiconducting deflector in a cable-to-oil-bushing termination?
Answer Typical applications Geometry
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Task
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Reference:
Engineering question
Model the stress cone and deflector with their permittivity and small conductivity in an axisymmetric AC-conduction analysis of the termination.
transformer cable bushings, cable-to-bushing interfaces, stress cone assemblies
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Simulation problem
Problem Type
Axisymmetric problem of AC conduction.
Voltage U = 64 kV (r.m.s.), frequency f = 50 Hz.
Relative permittivity of media: oil 12, insulator 2.3, stress cone 22, deflector 2.5.
Deflector electrical conductivity 0.0002 S/m.
Calculate electric field stress distribution.
Semiconductors are modeled as materials featuring both electric permittivity and conductivity, though small.
In QuickField we should specify the magnitude of the time-harmonic voltage that is room mean square value times square root of two: 64000*sqrt(2).
Simon Dubitsky, George Greshnyakov, Nikolay Korovkin Optimization of Capacitive and Resistive Field Grading Devices for Cable Joint and Termination. INTERNATIONAL JOURNAL OF ENERGY. volume 9. 24-30.
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