Patent ID: 11870235
Assignee: LS ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 6:
7. The self power relay of claim 6, wherein the abnormality sensing unit includes:
a detector for detecting three phases system currents and voltage used as the source power using at least one of a current transformer or a voltage transformer;
a monitoring unit configured to:
sample change in a current of each of the three phases system powers at a preset period; and
calculate differences between sampling values of three phases system currents of the three phases system powers obtained via a predefined number of samplings and monitor changes in the three phases system currents in real time, based on the calculated differences;

condition storage for storing therein a plurality of predefined abnormality occurrence conditions, and for supporting the monitoring unit to monitor the differences between the sampling values of the three phases system currents under the abnormality occurrence conditions; and
a fail generation unit for generating a second fail signal and sending the second fail signal to the relay controller and the self power generator when the monitoring unit determines that abnormality occurs in the three phases system currents.