System and method for detecting a leakage from power cables of a DC bus to ground

The present invention relates to a method for detecting a leakage from any of the power cables of a DC bus to a ground, in particular from the output connections of a charger for an electric vehicle to a ground, comprising the steps of superposing a stimulus current comprising at least one sinusoidal component to the charge current on the DC bus; measuring a response voltage on the bus; determining the impedance (capacitance and resistance) between the power cables and the ground based on a comparison of the superimposed stimulus current and the measured voltage and determining the presence of a ground fault when the determined resistance is lower than a predetermined or expected resistance. The invention further proposes a system for performing said method.