Exploring acoustic emissions for enhanced partial discharge fault diagnosis in cable insulations

Samad, Abdul and Ayub, Ahmad and Siew, WH and Given, Martin and Liggat, John and Timoshkin, Igor (2024) Exploring acoustic emissions for enhanced partial discharge fault diagnosis in cable insulations. In: International Conference on High Voltage Engineering, 2024-08-18 - 2024-08-22, Germany. (In Press)

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Abstract

Polymer insulators play a vital role in ensuring safety, reliability, and continuous supply of electricity. Over time, these polymers are degraded and lead to compromised insulation resistance which can lead to the catastrophic failure of the power network. Moreover, the presence of a void at the interphase of the different layers of the power cable due to the manufacturing fault, can ionize the gas molecules present inside the void and initiate a partial discharge (PD). These PD events contribute to degrading the polymer's insulation capability and can lead to insulation failure. Therefore, detection of these PD events at the initial stages is very important to avoid unplanned power outages. These PD events initiate an acoustic signal which can propagate through the insulation. These acoustic emission (AE) signals are being detected and analysed in gas-insulated systems (GIS) and oil-insulated transformers to detect and locate the PD. However, the propagation characteristics of the AE signals in solid insulating materials are still not fully explored. In this study, an analysis has been performed on the propagation characteristics of the AE signals in Polypropylene (PP) rods of different lengths measured in the laboratory. The electrical discharge event akin to PD event, was created in air but close to the surface of one end of the polymeric rod. The arrival of the propagating acoustic signal was detected by an acoustic sensor attached to the other end of the rod. An exponential decay in the peak magnitude and energy of the acoustic signal was observed with distance.

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