Heating of three-phase shielded supply at short circuit

摘要

Supplying conductors of high-powered electrical devices are highly stressed mechanically and thermally, in particular at shortcircuits. Mechanical stress on these conductors can significantly be reduced using wires shielded with steel jackets. On the other hand,the presence of shielding reduces the possibility of transfer of heat from the conductor and, moreover, further losses by eddy currentsinduced in the shielding jackets are generated. The paper describes a method for calculation of heating of such a shielded conductor.