Search results for "overhead ground"
showing 2 items of 2 documents
Distribution of Ground Fault Current in Substations Fed by a Combined Overhead-Cable Line
2005
When a substation is fed by a combined overhead-cable transmission line, in case of a fault to ground within the substation a consistent part of the fault current flows through the cable sheaths toward the remote source and discharges into the earth at the transition station, where cables are connected to the overhead line. This phenomenon, named "fault application transfer", may result in high ground potentials at the transition station which may cause shocks and equipment damage. In this paper a simple but accurate method on modelling a combined overhead-cable line is presented, allowing the computation of the fault current transferred at the transition station. Numerical analysis shows t…
A study on the use of bare buried conductors in an extended interconnection of earthing systems inside a MV network
2005
In the field of electrical safety an important topic is the transmission of voltages, during an earth fault, inside an extended interconnection of local earthing systems. The paper presents a study, with reference to the MV networks, about those systems where the interconnection between the earth electrodes of the electrical installations is carried out using bare buried conductors. Starting from the description of the circuital model of a bare buried conductor interconnecting together the earth electrodes of two MV/lv substations, the mathematical model of the whole interconnected earthing system is found. Finally, the results of some simulations, giving the distribution of the fault curre…