Heavily water tree-aged cables show a so-called 'nonlinear' dielectric response with respect to the voltage whose origin is still unknown and which is difficult to relate to the actual condition of the cable insulation. However, the 'non-linear' behaviour is one possible diagnostic criterion. The aim of the work presented in this paper is to investigate this 'non-linear' dielectric response in the time and frequency domain, as well as to correlate both domains by different mathematical approaches. The 'non-linear' behaviour of the dielectric response is found to be differeni in the time and frequency domain. Also a transition I50 m 'non-linear' to 'linear' behaviour of the dielectric response can be observed in some cases above a certain voltage.
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