Frequency-tuned resonant test systems for on-site testing and diagnostics of extruded cables

Frequency-tuned resonant test systems are state-of-the-art for onsite testing and diagnostics of high-voltage extruded cables. After experience with some realised systems, the technical data, especially the specific weight and the performance have been further optimised. A specially adapted diagnostic technique has been developed for this application. Basic research on cable samples with different failures has qualified AC voltage near to the power frequency to be the optimum test voltage wave shape. Resulting from these it is logical to apply this test voltage shape also to medium-voltage cable systems. An example is introduced in this paper.