Naslov
Analysis of conductor clashing experiments

Autori
Sutlovic, Elis ; Ramljak, Ivan ; Majstrović Matislav

Izvornik
Electrical engineering (0948-7921) 101 (2019), 2; 467-476

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Overhead power line ; Conductor clashing ; Particle ; Live network ; Experiment

Sažetak
Conductor clashing is one of the possible mechanisms how an overhead power line can cause wildfires. During the contact oftwo bare conductors of the energized power line on different potentials, or in the case of an arc between them, generated heatcan cause melting and vaporization of the conductor material. The pressure from the gasified metal may be high enough toeject the molten metal as small particles, which are then carried away by the wind. Consequently, molten or combusting metalparticles expelled during faults will fall below or, supported by the wind, in the surrounding area of the power line which canresult in ignition of the flammable vegetation on the ground. The important characteristics of the clashing fault are the energyof the arc and the erosion of the conductor material. The arc current and the arc duration determine the amount of materialremoved from the conductor, the size and number of the generated particles and the thermodynamic state of the particles.There are only a few published experimental researches dealing with the characteristics of the generated particles after thearcing of the conductors. All of them are laboratory simulations of the conductor clashing. This paper describes experimentsof an overhead line conductor clashing in a live low-voltage distribution network protected by fuses, as well as observationsnoted during the experimentation and during the processing of the measured results. The aim of the experiments was to studythe phase of the particle generation in realistic conditions in the electrical network and to investigate the operation of thepower line protection in case of the conductor clashing at different places along the line. The data analysis of a series ofexperiments has shown the impact of the wind speed, the fault duration, the fault current magnitude as well as the impact ofthe conductor clashing site on the particle size and the number of particles.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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