Type of Residual Current -What Do You Know?

AC superimposed DC residual current (AC+DC for short): The waveform feature is that the AC waveform is lifted by DC. In this case, leakage generally occurs on multiple loads, one load leakage occurs at the AC voltage, and one load leakage occurs after filtering.

Pulsating DC residual current generated by the three-phase power supply rectifier circuit (3PDC for short): The waveform feature is that there are three half-wave rectifier peaks in one cycle (20ms), no 0 point, and the corresponding leakage occurs after the three-phase power supply rectification.

Smooth DC residual current (SDC for short): The waveform feature is smooth DC, and the corresponding leakage occurs after rectification and filtering. Due to the existence of filter capacitors, the leakage is DC.

All 150Hz, 400Hz, 1000Hz AC residual currents”

Conclusion

After understanding so many residual current waveform features, are you worried that the leakage protector can really play a protective role? Is there any equipment that can provide comprehensive leakage protection? Blue Jay leakage current and residual current protection relays can provide comprehensive protection for different residual current environments and are widely used in various industries of industrial power automation.