Installation and evaluation of grounding system for EBM industrial latex at PTAPB using multiple rod

Installation and evaluation of grounding system for EBM industrial latex at PTAPB using multiple rod has been carried out. Installation is based on the needs of small grounding resistance (R_p) value by choosing the shape, size and number of electrode and the electrodes planting location. The well backfilled with clay in order to obtain low soil resistivity ρ on surrounding the electrode. Installation is done by planting the electrodes copper rod (Cu) diameter of 16 mm in 2 wells, each consists of 4 pieces @ 2 meters length and 8 pieces @ 1 meter length through 2 layers soil. From the electrodes with a predetermined configuration, obtained the average measured value of R_p is 3.99 Ω in wells I and 5.82 Ω in wells II or R_pt = 2,36 Ω in parallel, whereas the average of measurements value of electrodes is R_pt = 1.97 Ω. From trial and error by varying of ρ it is obtained that the resistance on the upper soil R₁ = 6.53 Ω and R₂ = 10.41 Ω for the bottom soil or in parallel obtained R_pI = 4.01 Ω for wells I, while for wells II R₁ = 7.72 Ω and R₂ = 23.64 Ω that if in parallel ob tined R_p2 = 5.81 Ω. When resistance on I and II wells being paralleled R_pt value is 2.37 Ω. The difference values of measured and calculation R_pt value is 0.40 Ω, it might be caused by the difficulty on R_pt measurement and the effect of inhomogeneity of ground resistivity from one place to another place. From the evaluation found that the influence of length and depth of planting electrodes more dominant compared to the number of electrodes. With the difference of 0.55 m electrode depth and 2 times the number of electrode obtained a very large difference in resistance i.e 18.47 Ω. (author)