Impedance measurements of large grounding grids

Measuring the ground impedance is a challenge when using the current-voltage method: The test current must be injected at a substantial distance from the ground grid. Then, it is crucial to be able to take an isolated measurement of the voltage rise, which is caused by the test current and not by any other current in the ground.

With the CPC 100 and 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. Using this frequency selective measurement method and narrowband digital filtering reduces the power requirements and weight of the equipment to a minimum. 

CPC 100

Multi-functional test system for high-voltage assets

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CP CU1

Multifunctional coupling unit for the CPC 100

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