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Design and Implementation of a Fault Detecting Algorithm for a High Voltage Underground Cable Using UHF Wireless Measuring Method

Vasighzadeh Ansari, Arman | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54101 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Vakilian, Mehdi
  7. Abstract:
  8. One of the common problems in using high voltage network is the occurrence of partial electrical discharge in high voltage equipment such as cables. This problem may not be serious at first, but over time it can cause wear, corrosion, or reduction of equipment life, and eventually, if not prevented in a timely manner, can cause electrical sparks, larger problems, and possibly equipment and network become irreparable. On the one hand, due to very clear reasons, we need the voltage level to be high, and on the other hand, due to the application of high voltage level and the need to optimally design the insulation system to reduce their dimensions and construction costs, there will be the possibility of partial discharge occurrence. Therefore, we have to accept the occurrence of partial discharges, however try to monitor continuously these partial discharges to be aware of the overall health of the insulation based on the trend of partial discharges extension in the equipment. In this research the PD signals are detected by wireless antenna in UHF frequency domain. The experiments have been done on an underground cable. Ideally, the results of such a research would be interesting for industry, if some experiments would have been done on cables which are really under the ground. But in fact, in this research we didn't prepare such a situation for cable and just had some experiments on a type of cable which is usually known as underground cable. By monitoring partial discharge signals and examining different spectral patterns, we can develop a relatively accurate criteria for judging the type of partial discharge, and whether they are "tolerable," "alarming," or "dangerous". These three words, refer to corona, surface and internal partial discharge, respectively. In this study, we intend to distinguish among three types of partial discharge defects; "corona", "surface discharge" and "internal discharge". Meanwhile, by measurement of partial discharge magnitude and the trend of its changes we can determine how the equipment is at risk. By putting these data together, we can reach the criteria for assessing the insulation health status and make network operator aware of necessary steps to maintain the reliability of network equipment
  9. Keywords:
  10. Underground Cables ; Ultra High Frequency Band ; Partial Discharge ; Ultra High Frequency (UHF)Wireless Measurement ; Wireless Monitoring ; Fault Detection

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