rogowski coils , also known as current measurement coil, differential current sensor, is a uniform winding in the non-ferromagnetic material on the ring coil. The output signal is a derivative of the current versus time. Through a voltage signal on the output of the integrated circuit, you can really restore the input current. Non-ferromagnetic material, no hysteresis effect, almost zero phase error; non-magnetic saturated image, which can range from a few amps to hundreds of thousands of current; simple structure, and the measured current is not directly between Of the circuit contact; response frequency bandwidth 0.1Hz-1MHz. Compared with the traditional transformer with iron core, Roche coil has a wide measuring range, high precision, stable and reliable, the response frequency bandwidth, at the same time with measurement and relay protection, small size, light weight, safe and meet environmental requirements. Based on the Roche coil with real-time measurement of current, fast response, not saturated, almost no phase error characteristics, it can be applied to relay protection, SCR rectifier, frequency control, resistance welding and other serious signal distortion occasion.

The rogowski coils suppliers is a hollow loop coil that can be fitted directly over the conductor to be measured. The alternating current flowing through the conductor produces an alternating magnetic field around the conductor, thereby inducing an AC voltage signal proportional to the current ratio in the coil. The Roche Coil Current Transmitter uses the electromagnetic induction principle to measure the AC current in the grid in real time. It uses true RMS and linear compensation technology to transform it into standard DC signal output. DC24V safe voltage power supply, with high precision, high isolation, high security, low power consumption and other characteristics, can be widely used in metallurgy, electroplating, welding and other fields.

The device is mainly composed of high current generator, DC power supply module, Rogowski coil measurement and processing circuit and traditional current transformer measurement and processing circuit. The high current generator generates a high current for measurement. In order to increase the contrast effect, the experiment used two measurement methods: Roche coil measurement and traditional current transformer measurement. Measurement, the Roche coil and the traditional current transformer through the high current through the wire, the induced signal, respectively, through a certain signal processing circuit, and finally the processed signal to the oscilloscope observation, can also be connected to the microcontroller experimental device On the use of single-chip current measurement of the size and display. The DC power supply system is used to supply 12V power to the op amps in the signal processing circuit.

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