Method for switching an operating current

A method for switching an operating current in a meshed DC voltage network, the method comprising the following steps:

• connecting converters to respective AC voltage networks;
• connecting the converters together on their DC voltage sides using the meshed DC voltage network;
• transmitting electrical power using each converter between the AC voltage network to which it is connected and the DC voltage network;
• providing the DC voltage network with a switching branch having a mechanical switch;
• regulating at least one of the converters to generate a zero current crossover in the switching branch;
• actuating the mechanical switch in dependence on the generated zero current crossover;
• causing the zero current crossover by a voltage drop generated at a DC voltage terminal of at least one of the converters;
• inducing a first voltage drop by using at least one of the converters and subsequently detecting and evaluating a curve of a switching current flowing in the switching branch;
• and
• then inducing a second voltage drop using the same at least one of the converters having a magnitude determined in dependence on the evaluation of the curve of the switching current.