Prevention method of abnormal action protection of UHV regulating compensation transformer with no-load input
US10090670B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 22, 2016 |
| Grant date | Oct 2, 2018 |
| Priority date | — |
| Expiry date | Mar 25, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/045
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a prevention method of abnormal action protection of UHV regulating compensation transformer with no-load input, the prevention method includes: first determining a value of differential current of regulating compensation transformer, if the value of differential current is smaller than a pre-setting threshold, then, identifying whether an uninterruptible point of differential current waveform meets an pre-setting regulation according to original value of differential current or sampling value of differential difference current, and determining comprehensively whether the regulating compensation transformer is in no-load input or in fault directly with a value of second harmonic content of logic differential current together; if a value of differential current before pre-setting period is larger than the pre-setting threshold, the regulating compensation transformer is diagnosed to have external CT saturation, determining comprehensively whether the regulating compensation transformer is in no-load input or in fault by using result of the uninterruptible point after delaying and the value of second harmonic content of logic difference together, and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.