Method and system for optical calculation in relay protection based on the faraday magneto-optical rotation effect
US12222374B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2023 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Nov 22, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H1/0092
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.