Large-signal inductance measuring device and method for performing a measuring operation for measuring an inductance

Method for performing a measuring operation for measuring an inductance at an electrical energy supply line arrangement operated with DC voltage and comprising a first conductor and a second conductor, by means of a large-signal inductance measuring device, the method comprising:

• arranging the large-signal inductance measuring device between a first portion of the energy supply line arrangement, which is connected to an electrical energy source and comprises a source-side part of the inductance, and a second portion of the energy supply line arrangement, which is connected to an electrical load and comprises a load-side part of the inductance;
• electrically disconnecting the first conductor of the energy supply line arrangement by means of a disconnecting switch;
• measuring a first change in voltage at a first capacitive arrangement by means of a first measuring device, wherein the first change in voltage is generated by means of a first series circuit comprising the first capacitive arrangement and a first diode arrangement, wherein a first end of the first series circuit is electrically connected to the first conductor at a source-side side of the disconnecting switch, and which is configured such that, after disconnecting the first conductor, a first current caused by the source-side part of the inductance flows through the first series circuit, which current leads to the first change in voltage at the first capacitive arrangement;
• measuring a second change in voltage at a second capacitive arrangement by means of a second measuring device, wherein the second change in voltage is generated by means of a second series circuit comprising the second capacitive arrangement and a second diode arrangement, wherein a first end of the second series circuit is electrically connected to the first conductor EL at a load-side side of the disconnecting switch, and which is configured such that, after disconnecting the first conductor, a second current caused by the load-side part of the inductance flows through the second series circuit, which current leads to the second change in voltage at the second capacitive arrangement;
• measuring, by means of a third measuring device, a third current on the first conductor before the first conductor is disconnected;
• and
• evaluating the measured first change in voltage, the measured second change in voltage, and the measured third current by means of an evaluation device in order to determine the source-side part of the inductance from the measured first change in voltage and from the measured third current, and in order to determine the load-side part of the inductance from the measured second change in voltage and from the measured third current.