An elongated member and use thereof

摘要

An elongated member has an outer sleeve-like rigid insulator shell (1) surrounding a high voltage conductor (5) extending in the longitudinal direction of the shell and a gap (10) inside the shell next to the internal wall of the shell at least partially surrounding said conductor and filled with a medium (11) of a material of with electrically insulating properties. Said medium is formed by an electrically insulating material containing hollow spaces at least partially filled with gas, and the material is adapted to expand upon a temperature rise thereof by reversibly compressing said hollow spaces and reducing the volume thereof.