The grounding resistance of grounding device has nothing to do with soil resistivity Is that right? Can you explain why

The grounding resistance of grounding device has nothing to do with soil resistivity Is that right? Can you explain why

How can it have nothing to do with it
Different soil resistivity, the requirements of grounding resistance are different
I can't tell the specific principle, but maybe you can think about it from the shunt and partial pressure of series and parallel connection

How many ohm grounding resistance is allowed for 35kV Transmission Line Tower when the soil resistivity is greater than 2000 ohm?
35kV line, without lightning line grounding system

When the tower height is less than 40m, the following requirements shall be followed; when the tower height is more than 40m, 50% of the following values shall be taken, but when the soil resistivity is greater than 2000 Ω m, the grounding impedance can be relaxed to 20 Ω when it is difficult to reach 15 Ω. When the soil resistivity is less than 500 Ω m, the grounding impedance is 10 Ω, when the soil resistivity is 500-1000 Ω m, the grounding impedance is 20 Ω, and when the soil resistivity is 1000-2000 Ω M, When the grounding impedance is 25 Ω and the soil resistivity is more than 2000 Ω m, the grounding impedance is 30 Ω, which comes from the 06 edition of standard for hand over test of electrical equipment in electrical equipment installation engineering

A substation is located in high soil resistivity area. Which of the following measures can be selected to reduce the grounding resistance?
A. For the soil with low resistivity within 2000m, external grounding electrode can be laid;
B. For the soil with 1000 Ω· m resistivity deep underground, deep well grounding can be used;
C. Laying gravel or asphalt on the ground;
D. Filled with artificial resistance reducer

The answer is a, D
A. For the soil with low resistivity within 2000m, external grounding electrode can be laid;
D. Filled with artificial resistance reducer

Wiring diagram of soil resistivity measurement with grounding resistance meter

&Hello, I have done this test, wiring diagram: 1) & nbsp; when measuring, insert four probes along a straight line in the soil to be measured, and make the distance between the probes equal, the distance between the probes is l, the probe into the ground depth is L / 20cm, and connect the four probes with wires from C1, P1, P2, C2 terminals respectively