Abstract: In order to study the power frequency and high frequency components of the total leakage current generated by refrigerator with inverter in the weight of GFCI (Grounding Fault Circuit Interrupter) tripping current, the calculation method of the total effective leakage current of GFCI tripping is systematically studied. The calculation method is mainly as follows: Measure the total leakage current of refrigerator and decompose it with FFT into various spectral components at power frequency and high frequency ;Measure the tripping level of GFCI tripped by high frequency harmonic leakage current;Convert high frequency leakage current into effective leakage current of power frequency;Calculate the total effective leakage current including all spectrum components at power frequency and high frequency. Finally, the feasibility of calculation method of the total effective leakage current is verified.

Key words: Variable frequency circuit, GFCI, Leakage current, FFT