変電所埋設地線のインパルス電流における接地抵抗特性について

抄録

Counterpoise is mainly used to reduce the grounding resistance as a part of a substation grounding and a tower footing. However, surge propagation, frequency-and current-dependent characteristics have not been cleared enough to be applied to the lightning protection design. Measurement data are required to develop a calculation model for the accurate analysis. Thus, the authors measured surge characteristics of the ground grids and straight conductor for low currents with steep wave front and high currents with a few microseconds rise time. This paper presents the measured data, and a grounding resistance model.