RFIZ

Introduction to Rogowski coil

The Rogowski coil also called a differential current sensor, is an “empty core” toroidal

coil arranged around a conductor, so that the alternating magnetic field generated by the

current induces a voltage in the coil. The coil is actually a current transformer coupled

to the conductor under test, and the voltage output directly from the coil is proportional

to the rate of change of the current.

For example:@50Hz/1kA Vout=85mV, @60Hz/1kA Vout=85*60/50=102mV.

If you want to obtain the current waveform or frequency independent current value, you

need to add an integral circuit to achieve 90° phase shift compensation and frequency

equalization.

The RFIZ series is a flexible current transformer based on the Rogowski coil principle,

which is a flexible rod-like hollow core coil that can be connected around the wire when

it is “live”. They are easier to install and measure than traditional open and closed CT.

Due to its flexible design and light weight, it is ideal for use in busbars and irregular

shaped multi-core bundles. Rogowski coil technology has low phase shift error,

inductance and good linearity, but is basically unaffected by electromagnetic

interference and pulsed DC current, so it has high accuracy.

The RFIZ-AC series coils can be used for both single-phase and three-phase

measurement applications.

Built-in voltage integrator can simplify wiring installation, can output 0~2V

AC voltage, rated input can be selected between 30A~10kA

The Rogowski coil also called a differential current sensor, is an “empty core” toroidal

coil arranged around a conductor, so that the alternating magnetic field generated by the

current induces a voltage in the coil. The coil is actually a current transformer coupled

to the conductor under test, and the voltage output directly from the coil is proportional

to the rate of change of the current.

For example:@50Hz/1kA Vout=85mV, @60Hz/1kA Vout=85*60/50=102mV.

If you want to obtain the current waveform or frequency independent current value, you

need to add an integral circuit to achieve 90° phase shift compensation and frequency

equalization.

The RFIZ series is a flexible current transformer based on the Rogowski coil principle,

which is a flexible rod-like hollow core coil that can be connected around the wire when

it is “live”. They are easier to install and measure than traditional open and closed CT.

Due to its flexible design and light weight, it is ideal for use in busbars and irregular

shaped multi-core bundles. Rogowski coil technology has low phase shift error,

inductance and good linearity, but is basically unaffected by electromagnetic

interference and pulsed DC current, so it has high accuracy.

The RFIZ-DC series coils can be used in SCADA systems and PLC applications.

The built-in voltage integrator can simplify the wiring installation, can output

0~2V DC voltage, rated input can be selected between 30A~10kA.