| 摘要 |
<p>An electric power cable, comprising means for the detection of an increase in its temperature above a predetermined point. Said cable comprises in combination a power lead (3) and at least one control lead (4) electrically insulated from each other by a low-melting insulating material (2) and enclosed in a common external insulation coating sheath (5) of the known type. The power lead (3) is embedded in a low-melting material (2) which insulates electrically the same from a control lead (4), the latter being coiled on the insulating material (2) so as to establish an electric contact with the power lead (3) when the insulating material (2) melts. As an alternative to the power lead (3) embedded in the low-melting insulating material (2) on which the control lead (4) is coiled, there is provided a power lead (3) surrounded by two or more control leads (4A, 4B, 4C) coated by insulating materials (2A, 2B, 2C), respectively, which melt at different temperatures, the highest of which can be borne by the power cable for its next operation. <IMAGE></p> |
