An analysis of errors in determining contact voltage due to the ignorance of phase-to-ground fault resistance

Abstract

One of the ways to assess the danger of electric shock in electrical distribution networks is the analytical determination of the touch voltage. In the emergency mode in these networks (phase-to-ground fault), the value of contact voltage depends on phase-to-ground fault resistance. Taking into account that the short circuit of the overhead line wire forming the distribution network can be on vegetation, snow, ice, melt water, etc., taking the short circuit resistance to zero will cause significant errors. The article describes possible errors in the calculation of contact voltage in the distribution networks with voltages up to 1000 V in different neutral modes in case of the phase-to ground fault.