On-line condition monitoring of power transformer health status enforced by temperature and electrical signatures

Ehnaish Aburaghiega, Mohamed Emad Farrag, Mohamed Mahmuod Gouda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Transformers play a vital role in the electrical power system network, loss of a power transformer has severe consequences on both the utility and customers depending on how long time it is out-of-service. Internal faults are said to be the most likely cause of disruption in transformer’s performance and, consequently, interruption of power supplied. Developing an on-line method to monitor and investigate the health of a transformer will help asset managers to assess infrastructure while it is operational, leading to reduced running costs and increased component life. This research develops methods of on-line and on-going condition monitoring of power transformers based on monitoring the transformer signatures (voltage and current on both sides of the transformer), winding and core temperature. An experimental study has been conducted to investigate the behaviour of a transformer under healthy and unhealthy conditions. A transformer designed to provide access to sections/turns terminals was used to generate short circuit test in different locations during operational time, thermocouples are distributed across the transformer windings’ discs in order to record their temperature during normal and abnormal operation. The results confirm the possibility of, in real time, detecting the presence of a short circuit fault, indicating its location and its severity. The correlation between the measured variables indicate the magnitude of the circulating current, thus the fault severity can be classified. The transformer temperature may also indicate the faulty windings and moreover which disc in each winding is short circuited.
Original languageEnglish
Title of host publicationProceedings of the 2019 21st International Middle East Power Systems Conference (MEPCON)
PublisherIEEE
Number of pages6
ISBN (Electronic)9781728152899
ISBN (Print)9781728152905
DOIs
Publication statusPublished - 27 Feb 2020

Keywords

  • transformer diagnostics
  • continuous on-line monitoring
  • temperature
  • fault detection
  • fault location
  • severity

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  • Cite this

    Aburaghiega, E., Farrag, M. E., & Gouda, M. M. (2020). On-line condition monitoring of power transformer health status enforced by temperature and electrical signatures. In Proceedings of the 2019 21st International Middle East Power Systems Conference (MEPCON) [123] IEEE. https://doi.org/10.1109/MEPCON47431.2019.9008023