8MENG Q B,HE J I.A new method to decrease the power frequency grounding resistance of grounding grids in power system[R].Beijing:International Conference on Electrical Engineering,1996.
9YAN H L.Research on the mechanism of grounding resistance-reducing agent and the used quantity[R].Tokyo Japan:proceeding of the 3th International Conference on Properties and Applications of Dielectric Materials,1991.
10MA J,DAWALIBI F P,SOUTHEY R D.On the equivalence of uniform and two-layer soils to multilayer soils in the analysis of grounding systems[J].IEE Proc.-Gener.Transm.Distrib,1996,143(1):49-55.
