Patent ID: 11965916
Assignee: SAFETYTEST GMBH
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 0:
1. A method for determining the resistive component of the leakage current impedance (Ri50) of a downstream branch to an alternating current network having a phase (L), a neutral conductor and a protective conductor (PE), comprising the steps of:
measuring by scanning a differential current ILN between the phase (L) and the neutral conductor (N) using a differential current sensor;
measuring by scanning a voltage (U) between the phase (L) and the neutral conductor (N) or between the phase (L) and the protective conductor (PE);
correcting a phase shift between the differential current ILN and the voltage (U-);
determining several individual differential current values ILN,i and several individual voltage values Ui, wherein the differential current values ILN,i are phase-corrected with respect to the voltage values Ui;
determining the effective power P from the several individual differential current values ILN,i and the several individual voltage values Ui;
determining the effective voltage UEff by means of the voltage values Ui; and
determining the resistive component of the leakage current impedance (RI50) by the effective voltage UEff and the effective power P.