Grounding measurement is the name of the process for measuring the grounding value of a building. As a result of this process a grounding report is prepared. Grounding measurement is a study carried out by people who have electrical engineering education and has a certificate in grounding. It is carried out with calibrated grounding measuring devices. The basic devices used for the earthing measurement are as follows: Depending on the type of measurement, a meger device with or without magnet (earth resistance tester) is used. Earthing measurements are carried out in two ways. The first is normal measurement. The other is the simplified measurement method. Grounding Resistance (ground resistance) is the reaction of the soil during the electric current flow. Earth is actually a weaker conductor than normal conductors such as copper. However, if the field for the current is large enough, the resistance is low and the ground can become a good conductor. For this reason, there is a resistance between the conductors and the earth in our system. Before the establishment of the facility, these measurements are made, after the necessary calculations and preparation, the installation is made.
Grounding measurement generally takes place in the following stages: The most basic concept that we come across here is grounding resistance. Already measured at this point is the grounding resistance. Grounding resistance is the name given to the resistance that the earth shows when it passes an electric current. Earth is a conductor. It has a resistance coefficient of its own. Here is this resistance value measured with the megger device. The specific resistance of the soil depends on where it is located. For example, while it is 30 in a swampy environment, this figure can go up to 3000 in stony ground. The lower the soil value, the healthier the system will be.
Factors Affecting Soil Resistance
The most common method in grounding measurement is done by hammering copper piles into 3 different points. In other words, electrodes with 2 piles and 3 probes are driven into the soil as deep as possible between 5 and 10 meters. A cable is connected to the earthing bar and the earthing bar is separated. A cable is also connected to potential electrodes and current electrodes. If the environment is humid during this process, the work to be done will be easier and the grounding resistance will be low. What you want is that the resistance is low. Before the measurement is made here, in order to obtain a healthy result, the piles should be measured after being stuck for at least a few days. Otherwise, it will not be possible to get a healthy result and the grounding resistance will be high. The grounding resistance tester (apparently) stage is brought to the grounding stage for measurement. And the measurement is done. The value should be less than 10 Volts. If not, there is a serious problem. This problem may be due to the device or there may be a problem in the grounding values of the building, in the electrical installation. In this case, the device should be tested, if there is no problem with the device, the installation of the building should be overhauled.
