Online Condition Monitoring of Partial Discharge in HV Underground Cables A. S. Ayub1, W. H. Siew2, J. J. Soraghan3 University of Strathclyde, Glasgow, UK 1 email@example.com 2 firstname.lastname@example.org 3 email@example.com Abstract - Partial discharges are symptomatic of many degradation phenomena in power cables and may cause further deterioration of the insulation in many cases. These symptomatic problems can be detected by using online and offline technique. However, both techniques have its own disadvantages e.g. noise, interference, partial discharge location, sensor optimisation and economical point of view. In order to minimise these, continuous monitoring of the insulation condition through online is therefore desirable i.e. partial discharge detection and location. SUMMARY Transmission and distribution of large The research survey found that the main quantities of power, as in power networks, issue considered by most authors was can be established using overhead lines or location and detection in power cables underground cables. Underground cables during online operation. Economic issues accommodate various voltages and power were also considered by some authors, but levels. Although overhead lines are to a lesser extent. Other issues, such as preferred from the investment-costs signal extraction, noise and interference, perspective, other factors such as aesthetic were considered briefly but not analysed in and environment considerations, safety detail. Therefore there was a clear need for issues, regulations and technical, favours the this project to investigate issues related to underground cables. Moreover, cables are signal extraction, noise and interference in also competitive if operation costs including detail. maintenance are put into account i.e. Various monitoring and diagnostic condition based maintenance. techniques have been utilised for the The application of condition-based condition monitoring of HV power cables. maintenance strategies can prevent outages However, there are some limitations for from cable failures, and offers substantial each technique. For instance, insulation savings for network utilities and enhanced resistance and dielectric loss measurements power supply reliability. Among these are useful for the assessment of average methods, the partial discharge (PD) insulation condition of the whole cable, but detection provides a non-intrusive and may not be sensitive to local insulation mostly non-destructive technique to identify defects. It is therefore the objectives of the incipient failure of components. authors to further improve these techniques Generally, PD are discharges that bridge and develop new and innovative techniques only part of the insulation material in a cable which are more reliable and widely or accessory and are indicative of the local acceptable for cable condition assessment. insulation condition and it occurs at defects With the aid of sophisticated analysis such as air filled cavities and it leads to programs, the condition of power cables can deterioration. Therefore, accurate mapping be more accurately determined to avoid of weak components within the system is catastrophic failures in high voltage cable crucial as cable connections do not degrade networks. uniformly. In addition, partial discharges can be measured electrically, acoustically and optically.
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