Comparison between utility sub-station and imitative earthing systems when subjected under lightning response |
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| Affiliation: | 1. Centre for Electromagnetic and Lightning Protection Research (CELP), Faculty of Engineering, Universiti Putra Malaysia 43400, UPM Serdang, Selangor, Malaysia;2. Department of Electrical Engineering, Faculty of Engineering, University of Mosul, Iraq;3. Department of Electrical Engineering, Firoozkooh Branch, Islamic Azad University, Firoozkooh, Iran;1. School of Electrical & Information Engineering, University of the Witwatersrand, Johannesburg, South Africa;2. Department ALDIS, Austrian Electrotechnical Association (OVE), Vienna, Austria;1. School of Science and Engineering, Teesside University, Middlesbrough, UK;2. Electricity Transmission Directorate, Bahrain Electricity and Water Authority, Bahrain;1. Electrical Engineering Institute Nikola Tesla, University of Belgrade, Koste Glavinića 8a, P.O. Box 139, 11000 Belgrade, Serbia;2. Faculty of Electronic Engineering, University of Nis, Aleksandra Medvedeva 14, P.O. Box 73, 18000 Nis, Serbia;1. Institute of High Voltage Engineering and System Performance, Graz University of Technology, Graz, Austria;2. ALDIS, OVE Service GmbH, Vienna, Austria;1. Mechanical Engineering Department, S.R.K.R Engg. College, Bhimavaram, India;2. Department of Mechanical Engineering, JNTU Kakinada, Kakinada, India;3. Defence Metallurgical Research Laboratory, Kanchanbag, India |
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| Abstract: | A comparison study between the utility substation and imitative earthing systems under lightning response is investigated. The utility sub-station is a non-operational sub-station, and the imitative earthing system is the earthing system that is purposely built to emulate the real earthing systems. However, no equipment is placed or connected to the earthing systems. The imitative earthing system is of a smaller size and is built separately at a different site. Both sites were designed according to the IEEE standard 80. Earth resistance measurements at low magnitude currents and at power frequency were also conducted for both earthing systems based on the IEEE standard 81. When impulse tests were conducted for both configurations, surprisingly the post-ionisation earth resistance of the imitative earthing system under lightning response was found to be similar to those tested under low magnitude currents. However, for the utility sub-station, the earth resistance under lightning response was found to be higher than that designed at steady-state conditions. The results in terms of time delays were also found to be different than that found in literature. |
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