Grounding resistance of grounding electrode using carbon plate made of woody material

Abstract

Woodceramics is a carbon material made of woody material and is expected as an eco-material. The woodceramics can be used as an electrical conductor. To estimate the feasibility of the woodceramics as grounding electrode, the woodceramics plate was fabricated and the fundamental properties were investigated as grounding electrode. The resistance and density were measured by simple methods. The resistance of woodceramics plate was sufficiently low when the woodceramics was manufactured under the condition of annealing temperature of higher than 800 °C. The woodceramics plate had about one-ninth density the copper plate. The grounding resistance was also estimated. The grounding resistance of woodceramics electrode per 1 m2 was about 40 Ω and almost equal to that in case that copper grounding electrode was used. Furthermore, the impedance of the woodceramics electrode for surge current was measured. It was confirmed that the magnitude was sufficiently small. It was pointed out that the woodceramics can be applied to the grounding electrode.