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'ec'-'ht' Multiphysics error and impractical outcome of Temperature distribution for a Power Cable
Posted Jul 31, 2014, 6:08 a.m. EDT Low-Frequency Electromagnetics, Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 4.4 0 Replies
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There are 2 physical problems that I'm required to solve simultaneously;
1] the distribution of electrical current (due to an application of high-voltage)
2] the distribution of temperature
My model under analysis has a copper conductor (simulating a 500kV Cable) which is enclosed inside a cylinder having a top and bottom Torus. This complete arrangement is then enclosed inside SF6 gas chamber.
This complete equipment is a high-voltage component operating at 500kV and therefore I'm required to apply a voltage of 500kV to the top Torus and Ground to the bottom Torus of the Cylinder (and also high-voltage to the top boundary of copper conductor and Ground to the Cable bottom) for computing the Electric fields for the optimisation of this equipment.
However, when I apply this high-voltage, 500 kV to the copper conductor (of the cable, which is also a high voltage cable), COMSOL is looking at a very high current through the conductor resulting in a very high temperature.
As per my calculations, I have a rated current of 2621.4 A through the copper conductor (considering the cable thermal effects from the data sheet). The resistance (from the data sheet) is 1.848e-5 ohm. This gives a very small voltage of 48.44 mV (Ohm's law) which is correct because it is simply the voltage drop over the cable.
But how do I make COMSOL understand this effect and at the same time apply 500kV for simulating the electric fields to my equipment and hence get a realistic temperature distribution with the temperature difference being 30[degC] between the conductor and the ambience
Can anyone please suggest something on simulating this issue??
Many Thanks (in advance)
Kind regards
Tanumay Karmokar
Hello Tanumay Karmokar
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