Abstract
High Voltage (HV) transmission mains form important assets in electrical networks. The existence of this infrastructure within the community necessitates effective earthing design to ensure safety compliance of the system. OHEW (Over Head Earth Wire) forms parts of the HV transmission mains, as such the OHEW plays an important role when it comes to fault current distributions and lightning protection for the transmission mains assets. The bonding between the OHEW and the conductive poles introduces the risk of step and touch voltages under substation fault. This research designs the pole earth grid to reduce the actual touch and step voltages to an acceptable limit. No research cited addresses the design of the steel poles to eliminate the high step and touch voltages. This paper endeavors to provide information in regards to the split factor and its relation to the pole grid resistance. Furthermore, the works introduces the novel arrangement of the steel poles to eliminate the EPR issues at the transmission structures under substation fault. The paper shows the advanced accuracy of the proposed new method in respect to the existing research methods. A Case study is also addressed to support the proposed theoretical study.
Original language | English |
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Pages (from-to) | 274-279 |
Number of pages | 6 |
Journal | Journal of Electrical Engineering |
Volume | 14 |
Issue number | 4 |
Publication status | Published - 2014 |