Wrong Powermeter Values

Sometimes, even when the power meter and the Rogowski coils have been installed correctly, the values we receive can still be inaccurate.

This is usually caused by high reactive power being measured, which can distort the actual power readings.

If you or the electrician installed the coils according to the power meter’s manual, the shield wire of each coil should be connected directly to earth/ground. However, if there is fault current flowing through the grounding system (for example, due to leakage currents, grounding issues, or other electrical equipment connected to the same grounding network), this can lead to incorrect measurements.

To resolve this, you can try either of the following:

• Disconnect the shield wires from earth/ground and connect all of them together in a WAGO connector.
• Connect the shield wires to the same terminal as the blue wire of the respective coils.

Both methods have resolved similar measurement issues in the past.

If that still doesn’t help and the measured reactive power is still unusually high, further investigation will be required to identify the device causing it.

At that point, the issue cannot be resolved by rewiring the power meter or the Rogowski coils, since the source of the reactive power is elsewhere in the system.