Overload protection of power lines

Abstract

The paper looks into configuring thermal image-type protections within the power lines numerical protections. The first part of the paper proposes a method to determine the time constant for the power line heating process. It is an essential measure for these protections. The cable lines are considered separately from the overhead lines. The protection characteristics offered by various numerical terminal providers are analyzed. Several configuration options are proposed depending on the specific situations. Examples are presented for cable lines and overhead lines.