| 摘要 |
A system and apparatus used to monitor a power cable 100, carrying multiple AC phases, in order to detect deformation of the multi-phase power cable. A distributed fibre optic interrogator unit (302, Fig 6) is used to interrogate a sensing optical fibre (301, Fig 6) coupled to the power cable to provide a measurement signal from each of a plurality of longitudinal sensing portions of the sensing optical fibre. An analyser (602, Fig 6) is configured to analyse the measurements signals to detect a characteristic of an imbalance in the magnetic fields induced by the multi-phase power cable. The characteristic may be a signal component with a characteristic frequency related to the power frequency and number of AC phases within the multi-phase cable. The sensing optical fibre may be sensitised to magnetic fields and may be coupled to a magnetostrictive material. |
