公开(公告)号：US20250052792A1

公开(公告)日：2025-02-13

申请号：US18517012

申请日：2023-11-22

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Caiyun MO ,  Guoqing ZHANG ,  Wenbin YU ,  Yuxin ZHANG ,  Ying XU ,  Zhizhong GUO

IPC: G01R15/24

Abstract: Optical calculation method and system for relay protection based on Faraday magneto-optical rotation effect are provided. A cascaded optical computing approach is employed, where three optical current transformers are connected in series on a single optical path. Final output optical signal represented as a cascaded multiplication of outputs of three optical current transformers, carries a Faraday rotation angle containing differential current information. Differential current required for protection is computed by modulation ratio which is calculated by use of a carrier and modulation wave signals of the output optical signal detecting by filtering circuit from the third optical current transformer.