Method and device for quickly eliminating ferromagnetic resonance of voltage transformer
US11264793B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 10, 2019 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Sep 22, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a method for quickly eliminating ferromagnetic resonance of a voltage transformer. The method includes: first sampling a three-phase voltage and an open-delta voltage of a voltage transformer; calculating a flux linkage corresponding to a zero-sequence voltage by means of an integral algorithm; and when detecting that ferromagnetic resonance occurs in the mutual inductor, further checking whether the absolute value of the flux linkage corresponding to the zero-sequence voltage or the absolute value of the open-delta voltage respectively falls within a set range, and if yes, starting a secondary resonance elimination loop for resonance elimination. The present invention also discloses a corresponding device for quickly eliminating ferromagnetic resonance of a voltage transformer. The present method and device accurately analyze and control resonance elimination trigger time based on a conventional secondary resonance elimination principle, and can effectively eliminate the impact of the core saturation of a voltage transformer on a resonance elimination process, thereby greatly improving the success probability of single resonance elimination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.