Patent ID: 11913999
Assignee: SIEMENS AKTIENGESELLSCHAFT
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 18:
19. A connecting unit for connecting a load zone to a DC system including two main lines and a ground fault monitoring unit configured to detect a ground fault on the main line for each of first main line and a second main line of the two main lines and produce measurement signals, the connecting unit comprising:
a circuit breaker connected between the first main line and a first load zone line of the load zone;
an interrupter switch connected between the second main line and a second load zone line of the load zone,
at least one measuring unit for at least a respective one of the first load zone line and the second load zone line, configured to continuously measure a line voltage, assigned to the respective one of the first load zone line and the second load zone line, between a line potential of the respective one of the first load zone line and the second load zone line and a ground potential, to produce measurement signals; and
a control unit, configured to control the circuit breaker and to identify a switching state of the interrupter switches, to receive the measurement signals of the at least one measuring unit and the ground fault monitoring unit and, upon a ground fault not being detected on any of the first main line and the second main line of the DC system before the load zone is connected, to deduce a ground fault in the load zone upon at least one line voltage not changing significantly after the interrupter switch is closed with the circuit breaker being open.