Abstract:
Cable joints are one of the examples of multilayer
dielectrics. Joints are subjected to high electric and thermal stress,
the former depending on the cable itself, while the latter is a
consequence of ohmic losses in a conductor due to load current and
leakage current flowing through the layers of the insulation. This
coactive effect might cause the cable joint to undergo
thermal/electrical breakdown at some point. Hence the estimation
of Electric fields at maximum thermal voltage of cable
joint/multilayer dielectrics in general, is of quite significant
importance. Current continuity equation, heat flux equation and
Poisson’s equation along with appropriate boundary conditions
were simultaneously solved at various current densities by finite
difference method and voltage versus current density is plotted. The
peak value of voltage, after which the solution of temperature goes
haywire is the Thermal Maximum Voltage and electric field
distribution and temperature distribution at that voltage/current
density are investigated.
