Patent ID: 11942896
Assignee: SOCIETA' ELETTRICA S.R.L.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC H

Claim 0:
1. A direct current electrical system, comprising:
one or more modules;
an inverter connected downstream of the one or more modules;
one or more protection switches inserted between the inverter and the modules;
at least one protection device, inserted in a branch which connects the one or more modules to the inverter, in order to detect the presence of an electric arc in the system and generate a fault signal and transmit it to the protection switch in order to open the switch,, wherein the at least one protection device comprises:
a first sensor provided with a first ring of ferromagnetic material configured to generate a first signal, representing a current flowing through a cable inserted in the ring;
a conditioning stage, having a bandpass filter, for conditioning the first signal generated by the first sensor;
a first threshold comparator, having a first, preset, adjustable voltage reference value, the first comparator being configured to receive as input the first signal conditioned by the conditioning stage;
a processor,
a second sensor, configured to generate a second signal representing a direct current component of the current flowing through the cable;
a second threshold comparator, having a second, preset, adjustable voltage reference value, the second comparator being configured to receive as input the second signal generated by the second sensor, wherein the processor is programmed to generate a fault signal in response to the occurrence of both of the following conditions:
the first signal exceeds the first reference value of the first comparator,
the second signal exceeds the second reference value of the second comparator.