Patent ID: 11962140
Assignee: SCHWEITZER ENGINEERING LABORATORIES, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A system to coordinate protective elements in an electric power system (EPS), comprising:
a Time vs Normalized Impedance Length (TNIL) subsystem configured to:
determine a first plurality of times of operation of a first protective element for a plurality of fault locations in the EPS;
determine a second plurality of times of operation of a second protective element for the plurality of fault locations in the EPS;

a protective action subsystem to coordinate a response of the first protective element and the second protective element and to:
establish a first pickup for the first protective element to implement a first protective action based on the first plurality of times of operation of a first protective element;
establish a second pickup for the second protective element to implement a second protective action based on the second plurality of times of operation of the second protective element;
detect a fault in the EPS; and
implementing one of the first protective action and the second protective action based on one of the first pickup and the second pickup.