Procedures for the operation of an electrical circuit

摘要

A method for operating an electrical circuit is described herein. The circuit includes a power converter having a plurality of switches and two capacitors that are parallel to the switches. The plurality of switches and the two capacitors are connected in series. The power converter has two AC voltage-sided connections and a measuring resistor is connected to the ground. A ground fault is detected by measuring a voltage drop in a measuring resistor.

主权项

1. A method for an electrical circuit comprising:
controlling a power converter having (i) a first series connection including at least two switches connected in series with one another, and connected in parallel with a second series connection including at least two switches connected in series with one another, and (ii) each having a potential electrically connected to the switches at an AC voltage-sided connection between the switches, wherein the power converter is connected in parallel with a set of capacitors connected in series with one another, the set of capacitors being electrically connected on opposite sides of a non-neutral connection point; measuring, when the potential at the AC voltage-sided connections between the switches changes from a first value to a second value during correspondingly switching of a respective switch from each of the at least two switches of the first series connection and the second series connection, a change in voltage in a measuring resistor from a first voltage to a second voltage, the measuring resistor being electrically connected between the non-neutral connection point and a ground; and determining a ground fault exists within the electrical circuit when the second voltage is a residual voltage established in a stationary reference time that has a value not equal to zero.