Abstract:
This paper presents simultaneous simulation of
interdependent electric and thermal fields inside a dc cable under
loaded conditions using analogous distributed circuit models for
thermal and electrical phenomena. Certain nonlinearities are
integrated in such circuit models, leading to simulation of electrothermal runaway, for the first time, in a dc cable. Using the
suggested, nonlinear circuit models, complete dynamics of the
temperature profile and electric field inside the cable dielectric
can also be obtained under various test and operating conditions
until electro-thermal runaway limits in time domain. The results
are useful for design and development of dc cables with safety
factors, apart from understanding the electro-thermal limits. The
models are validated with experimental results, found to be in
excellent agreement.
