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Flexible rogowski coil – RJ12 Series
Three Rogowski coils connected to a RJ12 plug, can easily be connected to meters like the ME131
The MRC series is a new generation of flexible Rogowski coil (Rogowski® coil) current sensors, which are especially suitable for measuring in combination with portable devices. MRC coils have different sizes to cope with different conductors. The new generation of MRC 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. MRC series coils have IP67 protection grade.
| Available Sizes | MRC-24, MRC-36, NRC-100, NRC-150 |
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Advantages of Rogowski coils:
- Easy to install in limited spaces, as is it soft and flexible
- Can be installed without having to switch off power or disconnect power supply
- Easy to install around large bus bars
- Excellent linearity
- Wide dynamic range
- Not damaged by large overloads
- Excellent degree of rejection to the external current conductor
- No danger from open-circuited secondary
- Zero power consumption
- Small position error
- Long-term stability
- Wide dynamic range
- IP67 protection level
Applications of Rogowski coils:
- Smart meters
- Rectifier current measurement
- Power quality analysis
- Motor overload/short circuit protection
- Current monitoring of power frequency and intermediate frequency welding machine
- Medium and high voltage switchgear protection system
- Remote Terminal Units (RTU)
Specifications:
What is a Rogowski coil?
Rogowski coils have been used for the detection and measurement of electric currents. They are based on a simple principle: an “air-cored” coil is placed around the conductor in a toroidal fashion and the magnetic field produced by the current induces a voltage in the coil. The voltage output is proportional to the rate of change of current. This voltage is integrated, thus producing an output proportional to the current. By using precision winding techniques, especially developed for the purpose, the coils are manufactured so that their output is not influenced by the position of the conductor within the toroid, and to reject interference from external magnetic fields caused, for example, from nearby conductors. Basically, a Rogowski coil current measuring system consists of a combination of a coil and conditioning electronics.
They can be used in similar circumstances to CTs (current transformers) but for many applications they have considerable advantages:
- Wide dynamic range.
- High linearity.
- Very useful with large size or awkward shaped conductors or in places with limited access.
- Thanks to the structure without hard core, the coil can be easily manufactured according to the application or to the available space.
- Unlike traditional current transducers, there is no danger from open-circuited secondaries.
- They cannot be damaged by large overloads.
- They are non-intrusive.
- They draw no power from the main circuit carrying the current to be measured.
- They are also light weight and in some applications are light enough to be suspended on the conductor being measured.
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