Abstract
Modern electrical-power systems are often exploited for transmitting
highfrequency carrier signals for communications purposes.
Series-connected air-core coils represent the fundamental component
allowing such applications by providing a proper filtering in the
frequency domain. They must be designed, however, to withstand also the
line short-circuit current. When a high-magnitude current flows through a
coil, strong mechanical stresses are produced within the conductor,
leading to possible damage of the coil. In this paper, an approximate
analytical model is derived for the relationship between the maximum
mechanical stress and the electrical/geometrical parameters of the coil.
Such a model provides the guidelines for a fast and safe coil design,
whereas numerical simulations are only needed for the design refinement.
The presented approach can be extended to other applications such as, for
example, the mechanical stress resulting from the inrush currents in the
coils of power transformers.
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