Abstract
Thirty two per cent of all injury risks identified at work are risks arising from work equipment. In this sense, the use of protective
equipment, respectively earthing devices during interventions / works in electrical installations are the main protective measure
against these risks. Short-circuit current calculation is necessary to determine the stress on both switching devices and protection
equipment in substations, and for choosing protective equipment for workers. This paper aims to make an analysis of the threephase
short-circuit on high voltage overhead lines with insulated neutral on workers, during the execution of the work, in the
protected working area using earthing devices. Case studies are done for different values of earthing dispersion resistance of
overhead line poles, in order to determine the most appropriate situation for safety of workers.