Hybrid Model for Analysis of Ground Fault Current Distribution
Abstract
This paper presents a hybrid numerical model for computation of the phase-to-ground fault current distribution between soil and neutral conductors of grounding system. Hybrid model is combination of electromagnetic model and transmission line model. In numerical realization, the finite element technique is used. Using electromagnetic model, conductive coupling between all buried non-insulated conductive parts of grounding system is taken into account. Using transmission line model, inductive coupling between phase conductors and ground wires of parallel overhead power lines is used. Similar transmission line approach is used for parallel power cable lines and cable line grounding wires. In computer programs developed for ground fault current distribution, the conductive coupling between all buried non-insulated conductive parts of grounding system can be taken into account or neglected. From the numerous numerical examples, it can be deduced that one can introduce a significant error by neglecting the conductive coupling. In presented numerical example, error caused by neglecting the conductive coupling between all buried non-insulated conductive parts of grounding system can be observed in rms values and phase angles of currents and potentials.
Slavko Vujević
Professor Emeritus
An expert in electrical engineering, particularly known for his contributions to numerical modeling of electromagnetic phenomena, lightning protection, and grounding. Throughout his career, he was a key member of the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, where he taught, mentored students, and actively participated in scientific research and international professional organizations.
Tonći Modrić
Associate Professor | Department of Electrical Intallations and Systems
Researcher and Full Professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split. His research focus is numerical modeling and calculation of the electric and magnetic fields in power systems and transmission lines, with an emphasis on the development of advanced models for interpreting geoelectrical ground survey data. Additionally, he is involved in the analysis of electromagnetic transients in systems with a high share of renewable energy sources, using finite element techniques.
