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The thermal limit is the main limiting factor for deciding loadability of EHV transmission lines.

The thermal limit is the main limiting factor for deciding loadability of EHV transmission lines. Correct Answer False

Thermal limit is NOT the main limiting factor for deciding loadability of EHV transmission lines (long). Here the cross-sectional area for EHV lines is mainly decided by electric field considerations (corona). So by default these lines have large thermal capabilities, much in excess of the SIL. Long lines are limited by voltage constraints, stability constraints. The line loadability actually behaves as a function of distance and accordingly gives characteristic preference for considering thermal, voltage or stability limits as its key limiting factor.

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