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Precautions for Ground Resistance Tester

time:2020/10/14   source:华天电力  reading:242 time

The ground resistance tester is a frequently used measuring instrument. For example, when installing equipment, a grounding resistance tester is needed. What should I pay attention to when using a grounding resistance tester?


The grounding resistance tester is used to measure the grounding resistance of grounding devices such as protective grounding, working grounding, anti-overvoltage grounding, anti-static grounding and lightning protection grounding. That is, the resistance that the grounding device exhibits when the power frequency current flows, including the resistance of the grounding wire, the resistance of the grounding body, the contact resistance between the grounding body and the ground, and the ground dissipation resistance. The appearance of the common ground resistance tester is very similar to the insulation resistance meter, and there are many models and specifications.


Earth Resistance Tester.png


What to pay attention to when using ground resistance tester:


(1) When the sensitivity of the galvanometer is too high, the potential detection needle can be inserted into the soil shallowly; when the sensitivity of the galvanometer is not enough, water can be injected along the potential detection needle to moisten.


(2) When the ground interference signal is strong, the rotation speed of the generator can be appropriately changed. To get a stable reading.


(3) When the distance between the ground electrode and the current detection needle is greater than 40m, the potential detection needle can be inserted within a few meters from the middle position, and the measurement error is negligible; when the distance between the ground electrode and the current detection needle is less than 40m When, the potential detection pin should be inserted in the middle of the straight line.


(4) When measuring, the grounding body should be disconnected from the protected equipment.


The ground resistance tester is used to test lightning protection grounding devices. There are two types: mechanical and digital. When you use the ground resistance tester, you must follow the above precautions.


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