How to deal with an increased system ground resistance
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The system grounding resistance is required to be less than 1 ohm, but the current measurement shows it to be greater than 1 ohm. Will it have a significant impact on the system? How can the resistance be reduced?
I once read that pouring some water near the grounding electrode can be effective in such cases.
I suggest you first take a look at the concepts related to grounding. No standard requires the grounding resistance to be less than 1 ohm! !
The ground resistance includes the resistance of the grounding connection and the resistance from the grounding electrode to the ground, with both values not exceeding 4 ohms. The resistance of the grounding connection means that the resistance from the grounding busbar to the grounding electrode must be no more than 1 ohm! So if the grounding connection resistance is greater than 1 ohm, check whether the connection from the busbar to the ground electrode is reliable. Regarding the ground resistance of the grounding electrode, what is measured is the power-frequency ground resistance, which is different from the measurement method mentioned above.
For simple questions, there’s time for other users on forums to answer them; just use Baidu and you’ll get the answer right away!
If the grounding resistance is high, the shielding effect is reduced, affecting system stability. Methods to reduce ground resistance: First, it is necessary to check whether the original construction was done properly; otherwise, another grounding electrode should be buried underground and connected in parallel with the original grounding strip
This is a requirement from the system manufacturer; I don’t know why either
The busbar connection is reliable, as verified by a resistance tester
The tests worked well before, but not anymore. There are various methods, but it’s unclear which one is more suitable, such as adding electrodes. Add salt and make it again; I just want to see what other methods there are
If the grounding electrode is part of concealed work, it is difficult to handle. Otherwise, adding salt is a simple and effective solution, or you can make another one directly.
That’s exactly the problem: at that time there was a chief designer, but now we only know the general location; we don’t know exactly where it is, so it’s not easy to handle