Hello to everyone. I have been encountered with filtering problem during measuring by rogowski coil. The rogowski coil ought to measure the lightning current . It supposed to use for only continuous current that characterised by low frequency bandwidth up to 3 kHz. Of course, the low (or continuous) current accompanied by strokes with significant higher frequency. It is led to the great induced voltages (M~di/dt). Unfortunately, the weakening by low-pass filter is not enough for such strokes (25 kHz and higher). Such strokes even could damage the circuit. Does someone have another Idea how to take away the signals with both higher amplitude values and great frequency? Thank you.

 

Hello,

You just hijacked an existing thread:
Amplifier for rogowski coil current sensor

Now you have a thread of your own.

Bertus