公开(公告)号：US11630424B2

公开(公告)日：2023-04-18

申请号：US16510222

申请日：2019-07-12

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Michael B Bryson ,  Dennis Haes

IPC: G04R20/00 ,  G04G7/00 ,  H02J1/00

Abstract: Systems and methods are provided for monitoring or protecting an electric power distribution system using protective devices that may rely on accurate time signals from a common time source. A first protective device may receive a first time signal deriving from the common time source and a second protective device may receive a second time signal deriving from the common time source. The first time signal and the second time signal may be compared; when a difference between them exceeds a defined threshold, time signal manipulation may be detected. The protective devices may modify their operation in response to or to account for the time signal manipulation.