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Experimental investigation of high frequency and transient performance of earth rod systems

Mousa, S., Harid, N., Griffiths, Huw and Haddad, Abderrahmane ORCID: 2014. Experimental investigation of high frequency and transient performance of earth rod systems. Electric Power Systems Research 113 , pp. 196-203. 10.1016/j.epsr.2014.03.024

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The high-frequency performance of vertical earth rods is important for designing earthing systems and lightning protection systems. In this work, experimental investigations on the high-frequency and impulse response of vertical earth rods with horizontal electrode enhancements are described. The rod electrode systems are installed at the Cardiff University outdoor earthing test facility and variable frequency tests were carried over the range 50 Hz–10 MHz. In addition, a low voltage impulse generator was used to inject impulse current of variable magnitude and shape into the electrode under test. The application of ‘4-point cross’ and ‘8-point star’ enhancements to single-rod electrodes have not only demonstrated the expected reduction of low frequency earth resistance but have also helped with a reduction in impedance at higher frequencies. Such enhancements may produce a greater overall benefit compared with extending the length of the rod only. Numerical simulations of the experimental setups agree quite well with test results over a low frequency range but more significant differences are seen at higher frequencies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: Elsevier
ISSN: 0378-7796
Last Modified: 17 Nov 2022 10:16

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