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Investigation of the High Frequency Effects of Lightning Impulse on the Voltage of Different Points of Grounding Grid with Considering Power Transformer
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Mohammad Talebzadeh   , Alireza Setayeshmehr * , Hasan Barati |
| Faculty of Electrical and Computer Engineering, Jundi Shapur University of Technology, Dezful, Iran |
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Abstract: (139 Views) |
In general, the earth and its connections are modeled using an impedance including resistor, capacitor, and inductor. Since the connection point resistance is due to the electrical resistivity of the connection point to the earth, in this the studied in the network area. The values of the capacitance and inductor are also considered for studied at high frequency and related to lightning and switching. In this paper, the effect of the earth impedance and the meshing network on the earth point voltage of the power substations during lightning is studied. Therefore, first, the electrical model of the soil is obtained according to the calculations and the electrical model of the meshing network is connected to each other through copper wires in model. Eventually, the electrical model of the electrodes ground in modeled is the earth network around and the corners. By applying a voltage lines connected to the transformers by lightning, the earth point voltage value is calculated and drawn at different points of meshing network. All of these stages are simulated in MATLAB/Simulink. The results show a change at ground point voltage level due to apply lighting at different points of the meshing network. The amount of impedance measured up to medium frequencies will be constant and at high frequencies up to 1 MHz will be incremental. All measurements and calculations have been done considering the power transformer and its connection to the meshing network. The aim of measuring the voltage of different points on the ground is to consider the power transformer, which is designed for better regulation of the protective relays, accurate measurement of the ground impedance. |
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| Keywords: Earth Impedance, Lightning, Impulse, Meshing |
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Full-Text [PDF 1113 kb]
(90 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2022/02/14 | Accepted: 2022/04/25 | Published: 2022/04/25
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