TS06
Electrical
- Jan 15, 2007
- 3
Hey Everyone,
I am involved in grid analysis for a number of substations. As part of this analysis I must look at the soil resistivity and grid resistance to attain step and touch potentials. I am using a program by SES called CDEGS. This program is very useful, however, I cannot seem to model everything as needed. For example, when analyizing one grid,the program used the cable lengths and soil resistivity to give me a resistance of approximately 5 ohms, however when looking at some GPR studies done on this grid in the past, they labelled the grid resistance as 0.5 ohms, due to the presence of some salt water grounding electrodes. The program will not model this scenario.
Thus, in order to get the grid resistance down to 0.5 ohms, I had to change the soil resistivity value. I do not like doing this, but could not see another way to model the lower grid resistance. Does this seem like a suitable way to model and get the required step and touch potential values?
Thanks for any help/guidance offered.
I am involved in grid analysis for a number of substations. As part of this analysis I must look at the soil resistivity and grid resistance to attain step and touch potentials. I am using a program by SES called CDEGS. This program is very useful, however, I cannot seem to model everything as needed. For example, when analyizing one grid,the program used the cable lengths and soil resistivity to give me a resistance of approximately 5 ohms, however when looking at some GPR studies done on this grid in the past, they labelled the grid resistance as 0.5 ohms, due to the presence of some salt water grounding electrodes. The program will not model this scenario.
Thus, in order to get the grid resistance down to 0.5 ohms, I had to change the soil resistivity value. I do not like doing this, but could not see another way to model the lower grid resistance. Does this seem like a suitable way to model and get the required step and touch potential values?
Thanks for any help/guidance offered.