Abstract
The effective cable insulation condition monitoring can significantly reduce the outages caused by cable failure. This paper proposes an on-line method for cable insulation monitoring, utilizing the natural power disturbances originated from the outside of cable. In this method, the relative permittivity of cable insulation is used as the indicator to be monitored, which is closely associated with cable tanδ. The relative permittivity is extracted from the power disturbances and their responses, which are of sufficient strength and wide range of frequencies. This method doesn't need the remote synchronized phase angle information of measurements, which is beneficial to the on-line monitoring. The case studies and sensitivity studies are also conducted and the results are presented in the paper.
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