NRC series

Ø8 screw type flexible Rogowski coil

The NRC series is a new generation of flexible Rogowski coil (Rogowski coil)  current sensors  , which are especially suitable for measuring in combination with portable devices. NRC coils have different sizes to cope with different

conductors. The new generation of NRC coil strengthens the shielding layer and greatly reduces the influence of

external magnetic fields; it can be directly connected to our rail-mounted and panel-type meters without the need for external integrators. NRC series coils have IP68 protection grade, which is extremely suitable for outdoor use.

Advantage

l   Excellent linearity

l   Wide dynamic range

l   Not damaged by large overloads

l   Excellent degree of rejection to the external current conductor

l   No danger from open-circuited secondary

l   Zero power consumption

l   Small position error

l   Soft and light, easy to install

l   Long-term stability

l   Wide dynamic range

l   IP68 protection level

l   Applications

l   Smart meter

l   Rectifier current measurement

l   Power quality analysis

l   Motor overload/short circuit protection

l   Current monitoring of power frequency and intermediate frequency welding machine

l   Medium and high voltage switchgear protection system

l   Remote Terminal Unit (RTU)

l   Synchronous Phasor Measurement Unit (PMU)

l   Current measurement on the secondary side of the electric furnace

FAQ 

1. Does the NRC Rogowski coil require an external integrator?

Not always. The NRC flexible Rogowski coil can be directly connected to compatible HEYI rail-mounted and panel-type meters without an external integrator.

For other meters, power analyzers or monitoring devices, an integrator or signal-conditioning module may be required depending on the input specification of the device.

If you plan to use the NRC Rogowski coil with a third-party meter, please provide the meter model and input signal requirements so we can check compatibility.

2. Can the NRC Rogowski coil work with my power meter or energy meter?

Yes, the NRC Rogowski coil can be used in power measurement and energy monitoring systems, but compatibility depends on the input requirements of the meter.

Some meters are designed to accept Rogowski coil signals directly, while others require an integrator or signal converter.

For correct selection, please provide your:

• Meter brand and model
• Input signal requirement
• Measuring current range
• System frequency

We can then recommend a suitable Rogowski coil configuration for your application.

3. What output signals are available for the NRC Rogowski coil?

A Rogowski coil naturally produces a voltage signal related to the rate of change of the measured AC current. The final signal used by the meter depends on the Rogowski coil, integrator and measuring device configuration.

Different power meters may require different input signals, so the output should be selected according to the target measuring system.

If you require a specific output signal, please send us the input specification of your meter. HEYI can evaluate the appropriate solution for your project.

4. How do I choose the correct Rogowski coil size for my cable or busbar?

The correct flexible Rogowski coil size mainly depends on the dimensions of the conductor and the available installation space.

For cables, please provide the cable diameter or the number and size of cables passing through the coil. For busbars, please provide the busbar width, thickness and arrangement.

It is also recommended to provide:

• Cable or busbar dimensions
• Rated operating current
• Maximum expected current
• Available installation space

The flexible structure of the NRC series makes it suitable for large cables, busbars and applications where conventional current transformers are difficult to install.

5. What current range can the NRC Rogowski coil measure?

The NRC Rogowski coil is designed with a wide dynamic range and is suitable for AC current measurement over a broad operating range.

Unlike conventional magnetic-core current transformers, a Rogowski coil does not use an iron core, which makes it particularly suitable for measuring large currents and applications where high current variation may occur.

The correct selection depends on the rated current, maximum current and connected measuring device.

For project selection, please provide your normal operating current and maximum expected current so that we can recommend the appropriate NRC configuration.