By hvhipot 
Since the ground resistance tester is to test the ground resistance of the circuit, it plays a huge role in maintaining the safety of the circuit. Therefore, in its operation and use, the staff must standardize the work to ensure that it does not cause problems. So what aspects should we pay attention to in use?
1. Reduce the grounding resistance of power line towers.
The advantage of this is that it can improve the lightning resistance level of the line, reduce lightning accidents, reduce the touch voltage and step voltage near the tower, and avoid electric shock accidents of humans and animals. Therefore, the grounding resistance of the tower is an important data. All aspects of design, construction, and operation must be paid attention to, and its actual value must be accurately measured and lower than the specified value.
2. The measurement method must be correct.
The grounding resistance tester measures the grounding resistance of power line towers with simple methods and high reliability of the measurement results, but it can only be used on high-voltage lines with overhead ground wires. During measurement, only one ground down conductor is allowed for the tower to be tested, such as each tower The ground net of the foot is not connected, and the ground down conductors of other feet should be disconnected and connected with the down conductor of the measuring foot with a temporary wire. Through the analysis of the measurement results, it can be judged whether the ground grid of each tower foot is connected, and whether there is a risk of poor touch in the grounding down conductor.
3. Understand the measurement principle of the grounding resistance tester.
This is used to measure the ground resistance of any looped system. The instrument itself can generate a power supply potential, and current can occur in any looped system. Therefore, its measurement principle is simply the full circuit Ohm’s law. It measures Is the loop resistance value of this loop system.