1results about How to "No impact on security" patented technology

This utility model relates to the field of active power filter technology and provides an active power filter device, comprising: a current transformer connected between the mains power supply and the load for acquiring three-phase current signals; an active power filter whose input terminal is connected between the mains power supply and the current transformer, and whose current transformer interface is connected to the current transformer; the active power filter includes a control board and a display module; the control board is connected to the input terminal and is used to acquire the three-phase voltage signal of the power grid through the input terminal, acquire the three-phase current signal through the current transformer interface, and generate a connection anomaly detection signal for the current transformer based on the three-phase voltage signal and the three-phase current signal, and send a flag bit signal corresponding to the connection anomaly detection signal to the display module. This solves the problem of quickly and accurately providing a connection anomaly detection signal for the external current transformer of the active power filter.