Testing plastics insulating covering of superconductor, by wetting the covering using liquid that causes local color change at defect locations

摘要

The method involves wetting a plastics electrically-insulating covering (11) surrounding a superconductor (1) with a liquid (2) that causes a local change of color at defect locations (13) on the covering. After it has passed through an action distance, the conductor (1) is optically tested for local color changes. The liquid may be ethanol.