The ground resistance of the transmitter is the resistance encountered when the current flows from the grounding device to the ground and then flows through the ground to another grounding body or spreads to a distance. It includes the resistance of the ground wire and the ground body itself, the contact resistance between the ground body and the earth resistance, and the earth resistance between the two ground bodies or the earth resistance of the ground body to infinity distance. The grounding resistance value of the transmitter reflects the good degree of contact between the electrical installation and the “ground” and reflects the scale of the grounding grid.
The standard effective ground resistance value requires:
1. The grounding resistance of independent lightning protection should be less than or equal to 10 ohms;
2. The grounding resistance of independent safety protection should be less than or equal to 4 ohms;
3. The independent AC working grounding resistance should be less than or equal to 4 ohms;
4. The independent DC working grounding resistance should be less than or equal to 4 ohms;
5. The common grounding body (joint grounding) should not be greater than the grounding resistance of 1 ohm.
The transmitter must be grounded during on-site use, so as to ensure the stability of the transmitter signal, the safety of the transmitter and its related equipment, and the personal safety of the personnel on the site of the transmitter application. It can also ensure that the other AC and DC circuits of the whole system where the transmitter is located are grounded.
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