Abstract
A new approach to lightning transient studies including complex grounding grids is presented in this paper. The grounding system is modeled in Matlab/Simulink based on the transmission line theory. Using a bottom-up approach and considering the properties of the fundamental elements, a detailed view of measurement values will be presented and analyzed. The Matlab/Simulink grounding system models are interfaced for co-simulation with EMTP-RV trough Functional Mock-up Interface (FMI) 2.0. This modeling approach allows the use of the full component library and network design by EMTP-RV to evaluate and analyze the effects of the grounding system and transmission network simultaneously in Matlab/Simulink. The results present a simplified transmission system where a surge is injected, Conseil International des Grands Réseaux Électriques (CIGRE) 1 kA 1.2/50, in far-end of a transmission line. When reaching a substation, the surge is injected into the grounding system through a surge arrester.
Highlights
A grounding system, which is essential for proper, reliable and safe operation of a power system, can be accomplished by providing a true reference to the electrical system that controls the discharge path of high energy faults
A method of implementation to evaluate the effect associated with lightning transient in the transmission system and the corresponding effect on the grounding system is not publicly available
Lightning surges on overhead transmission lines may introduce travelling waves which have the potential to penetrate deep into a substation and present hazards ElectroMagnetic Interference (EMI) for sensitive equipment
Summary
A grounding system, which is essential for proper, reliable and safe operation of a power system, can be accomplished by providing a true reference to the electrical system that controls the discharge path of high energy faults. The reviewed literatures tend to treat high energy faults originating from direct lightning strikes discharged trough the grounding system. A method of implementation to evaluate the effect associated with lightning transient in the transmission system and the corresponding effect on the grounding system is not publicly available. Lightning surges on overhead transmission lines may introduce travelling waves which have the potential to penetrate deep into a substation and present hazards ElectroMagnetic Interference (EMI) for sensitive equipment. This paper presents an approach whereby the combined simulation of the grounding and transmission system is performed based on software implementation. Since the substation surge arrester is evaluated as the injection point to the grounding system, the surge arrester performance is considered. The time and spatial distribution of the potential rise in the grounding itself is presented to consider EMI preventative action in the substation area.
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