Powertag Rope Noise issues

[RWG924]

Can anyone advise if the Rope type CT of Powertag is immuned from electrical noise?

We are installing the CT inside an electrical trunking where a lot of electrical cables will be around.

[Mehran_Mehrnia]

Hi @RWG924 

PowerTag Rope is a Rogowski solution, which relies on measuring the rate of change of current (di/dt) which is different from conventional CTs that use magnetic cores. This makes them sensitive to external magnetic fields, however there are some Installation Best Practices:

• Center the conductor within the loop as much as possible to improve accuracy and reduce noise pickup.
• Avoid placing the CT loop too close to adjacent phase conductors, especially in tight trunking. The influence of nearby phases can distort the measurement.
• Fix the CT loop securely around the conductor if possible. If not, ensure it is stable and not in contact with other conductors.
• Route the CT leads away from high-voltage cables and avoid parallel runs with power lines to minimize induced noise

Installation guide

Best Regards,

-Mehran

L3 Expert Advanced metering

[Jesus_Diaz · Accepted solution]

Hello @RWG924,

The term electrical noise can be difficult to translate into something factual. The PowerTag Rope complies with the requirements defined in IEC 61557-12. However, the question specifically concerns crosstalk, which is not clearly defined in current standards.

The PowerTag Rope current sensor is specified to tolerate no more than a 0.4% deviation in its measurement due to interference from a neighboring wire. To minimize external influences, we recommend avoiding the placement of external wires near the closing block, as illustrated in the instruction sheet and as @Mehran_Mehrnia has already mentioned.

Best Regards,

JD

[RWG924]

Thx JD. Do we have any documentation quoting the 0.4% deviation max limit due to cross talk even it is installed in a highly conductive influence trunking?

Many thx

[Jesus_Diaz]

Hello,

That is our internal specification for the current sensor on the rope. We can prepare a declaration that can be shared with you. However, we need to clarify which parameter is of interest to you (e.g., current, power, etc.).

Best regards,
JD

[RWG924]

Many thanks. We need this document for a transportation customer. They concern with the Current and Power accuarcy.  So for the Power accuracy , it is still limited at 0.4%; the same as current?

[RWG924]

@Jesus_Diaz   Please let me know the duration to get this 0.4% certificates for Power and Current.

Many thanks