Ground Impedance

Regular verification of the ground impedance is a prerequisite to guarantee that electrical installations can operate on a safe basis. Via injecting a test current with a power line into a remote location, the voltage distribution outside the to be tested grounding system can be checked. Especially in fault scenarios like power line faults or lightning, high voltage differentials can occur in the near vicinity of electrical installations.
Ground impedance testing is one part to ensure that area earthing conditions comply with national regulations.

OMICRON’s solution relies on the frequency-selective injection method, avoiding that heavy and expensive equipment is required for measurement. With the mobile voltmeter HGT1 and a spike, test engineers can easily cover the distance from the grounding system till the end of the voltage influence zone. Via the direct integrated display, it can be easily recognized when measured voltage level stabilize and out of this the ground potential rise can be determined. To assess and report results, automatic assessment according IEC & IEEE as well GPS documentation are supporting the workflow.

Benefits of this solution

Reflection of real fault conditions

Measuring the ground impedance of large ground grids requires the injection of test current via a power line in order to reflect real fault conditions. This allows true test values to be determined.

Ground impedance measurement

PTM for HGT1 enables you to perform fully automated ground impedance testing with convenient tracking for test points via GPS and impedance and voltage charts that are instantly available.

Variable frequency

With the CPC 100 + CP CU1 you can vary the frequency and inject current at non-network frequencies into the soil via the existing power lines. The system then selectively measures the voltage rise at the frequencies being used.

High level of safety

To protect you and your equipment, the CP CU1 comes with the CP GB1 grounding unit. This unit can divert currents of up to 30 kA if its voltage limit value is exceeded due to unexpected induced potentials on adjacent lines.

COMPANO 100

COMPANO 100 grounding measurements follow a guided workflow. The clear instructions and the graphical representation are unique in this field, making these measurements easier than ever before. As a battery-operated device, COMPANO 100 is ideal for determining ground impedance in remote areas, where the availability of mains power is a concern. An integrated reduction factor calculation makes a direct on-device evaluation of measurement results possible.

COMPANO 100

Primary injection, secondary injection and basic protection test set

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PTM + PTMate

The well-structured Primary Test Manager™ (PTM) database enables you to define and manage locations, assets, jobs and reports in an easy and fast way. PTMate is your mobile companion for PTM. The app supports you on site and extends the PTM feature set to your smartphone.