Radiometric localisation of partial discharge sources inside Air‐insulated electrical substation. Issue 8 (1st October 2019)

• Record Type: Journal Article
• Authors: Kumar Mishra, Dipak; Bhukya, Anitha; Koley, Chiranjib; Kumar Roy, Nirmal
• Is Part Of: IET science, measurement & technology. Volume 13:Issue 8(2019)
• Page Start: 1122
• Page End: 1130
• Publication Date: 2019-10-01
• Subjects: substations -- direction‐of‐arrival estimation -- entropy -- partial discharges -- air insulation; modified direction‐of‐arrival‐based method -- joint entropy‐based TDOA calculation method -- air‐insulated electrical substation -- ultrahigh frequency sensors -- partial discharge activities -- air‐insulated substations -- reported far‐field‐based localisation system -- modified DOA‐based localisation algorithm -- JE method -- TDOA estimation -- PD sources -- multiple sensors -- UHF waveforms -- UHF PD detection system -- localisation ability -- economical tool -- partial discharge sources -- radiometric localisation; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2019.0004
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : Monitoring partial discharge (PD) activities inside electrical substation using few ultra high frequency (UHF) sensors mounted around the periphery of the substation could be a useful and economical tool. In this work, an experimental study has been conducted in the laboratory and in substations to investigate the localisation ability of the UHF PD detection system. For localisation, one needs to calculate time difference of arrivals (TDOAs) between the UHF waveforms obtained from the multiple sensors mounted around the substation. After that these TDOAs are used for localisation of the PD sources. In this paper a novel joint entropy (JE)‐based TDOAs calculation method is proposed and also compared with the existing techniques. For localisation of PD sources, a modified direction of arrival (DOA)‐based method for the near field is proposed, as found to be suitable when the sensors are mounted around the substation. Obtained results in TDOA estimation using the proposed JE method is in line with other technique; however, it was found to provide consistent results and is useful in an extreme situation. Modified DOA‐based localisation algorithm found to provide improved performance due to the elimination of approximation as required in previously reported far‐field‐based localisation system for the air‐insulated substations.