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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.
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2.发明公开公开(公告)号：US20240125821A1
公开(公告)日：2024-04-18
申请号：US18544543
申请日：2023-12-19
Applicant: HARBIN INSTITUTE OF TECHNOLOGY
Inventor： Guoqing ZHANG , Wenbin YU , Caiyun MO , Yuxin ZHANG , Jie ZUO
Abstract: A schematic diagram of a wideband measurement system for mixed-connected CVT based on an optical voltage sensor is provided. The wideband measurement system comprises a CVT power frequency measurement section and an optical wideband measurement section. In the optical wideband measurement section, a low-voltage capacitor is connected in series between the low-voltage terminal and the ground terminal of the medium-voltage capacitor in the capacitor voltage divider. An optical voltage sensor is connected in parallel across the terminals of the low-voltage capacitor to measure the wideband voltage signal under test. The wideband measurement system for mixed-connected CVT described in the invention enables the CVT to have wideband measurement capabilities while ensuring the accuracy of conventional CVT power frequency measurements.
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