The grounding resistance of the solar container communication station is not greater than

What are the elements of grounding resistance?

Grounding resistance is comprised of the following elements: Electrode resistance and resistance of its connection. Ground resistance immediately surrounding the grounding electrode or resistivity of ground. Typically, this is the major factor. Contact resistance of the surrounding ground to the electrode. Figure 1.

How much ground resistance does a substation need?

Typically, the subterranean grid system of a substation will give the needed resistance. 5Ω is frequently the acceptable value in light industrial or telecommunication central offices. For lightning protection, the arrestors must be paired with a maximum ground resistance of 1Ω.

Why is the resistance of a grounding electrode higher?

The only element that remains is the resistance of the surrounding ground. The electrode can be looked at as being surrounded by concentric shells of ground, all of the same thickness. The closer the shell to the grounding electrode, its surface area is smaller. Therefore, its resistance is higher.

What is the difference between AC and DC grounding in PV systems?

Both grounding electrode conductors (GEC) are connected to the individual grounding rod used for both systems. Meanwhile, both ground electrodes (AC ground rod and DC ground rod) are bonded through a bonding jumper as required by NEC. The following fig shows an alternative way of grounding AC and DC in PV systems.