Resistivity plays an important role in ensuring that the electrical system works correctly. Resistivity is the resistance of the soil to the flow of electric current. Compared with normal conductors, the earth has a very poor conducting power, but this resistance can be eliminated, turning the earth into a good conductor.
Earth resistance is measured in order to:
- Determine the effectiveness of the “earth” networks and connections used in electrical systems in order to protect personnel and equipment.
- Prospecting for good “earth” locations (low resistance).
An earthing system (SPAT) plays a vital role in electrical safety, for the safety of people and for the protection of sensitive equipment against overvoltages. Hence the importance of the earth tester, which checks the correct operation of the SPAT.
The Wenner method consists of measuring the resistivity of the soil by inserting 4 electrodes into the ground and placing them in a straight line and at the same penetration depth. The resistivity will therefore depend on the distance between electrodes and on the resistivity of the ground.
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Maintenance in an electrical substation must be carried out at least once a year to check the correct operation of its main equipment. By carrying out proper preventive maintenance (physical, mechanical, electrical and dielectric inspection) we avoid failures, which makes it possible to preserve the elements that make up the substation.
The most outstanding earth tester models available from Amperis are the ones shown below. For any enquiry, do not hesitate to contact us and our engineers will find the best solution for your needs.
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AMRU 200 Earth Tester
- This unit is the only meter on the market that implements all the measurement methods (with 2, 3 or 4 poles). The operator can select the measurement method anywhere and under any condition.
- Dynamic resistance impulse measurement method.
- With this unit it is possible to carry out auxiliary inspection measurements that support system diagnostics.
- The AMRU-200 performs the impulse measurement in accordance with the IEC-61024-1 standard
- The AMRU-200 stands out for its intuitive operation with a large graphic display, innovative design and a multitude of functions that allow the optimum measurement method to be selected easily.
AMRU 120 Earth Tester
- It allows ground resistivity measurements (Wenner method) and earth connection resistance measurements using auxiliary electrodes, a double clamp or electrodes+clamp.
- The AMRU120 allows the measurement of the continuity of bonding and protective connections.
- Continuity measurement of protective and bonding connections, measuring range according to IEC61557-5, earth connection resistance measurement (3- and 4-wire method), measuring range according to IEC61557-5
Meters in electrical installations are instruments that record the amount of electrical energy used. These units are highly accurate since they are one of the most important parts in any electrical installation and they are designed to withstand adverse working conditions. Amperis electrical installation meters stand out for their versatility and their good performance, maintaining the safety of the installation.
With these units it is possible to measure different parameters, test insulation continuity, measure the resistance of earthing systems, RCD tests, loops, etc.
The AMPI family of units from Amperis are electrical installation testers that comply with current regulations and verify the safety of installations before they are commissioned.
Multifunction electrical installation meter AMPI-520 and AMPI-525
- Perfect for carrying out diagnostics in accordance with the IEC 61557 standard.
- The unit allows short-circuit loop measurement, testing of residual current devices, general and selective; phase sequence checking and measurement of insulation resistance and earth resistance.
- These units are designed to measure and record a multitude of parameters such as AC voltage, current, frequency, power, etc. ** **