Adaptive protection method for impedance of parallel capacitors
US11063424B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 11, 2017 |
| Grant date | Jul 13, 2021 |
| Priority date | — |
| Expiry date | Nov 24, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An adaptive protection method for impedance of parallel capacitors comprises monitoring a terminal voltage and current of the capacitor; automatically calibrating the initial impedance of the capacitor when the capacitor is put into operation; calculating a real-time impedance of the capacitor during operation, dynamically updating the actual impedance of the capacitor periodically; comparing the real-time impedance of the capacitor with the actual impedance, updating the actual impedance if the relative value of the modulus of the real-time impedance change does not exceed the dynamic update limit threshold and the dynamic update reaches update period; generating an update failure alarm if the relative value of the modulus of the real-time impedance change exceeds the dynamic update limit threshold; generating a protection alarm if the relative value of the modulus of the real-time impedance change satisfies the protection alarm condition and the delay time is reached; and protecting the trip outlet if the relative value of the modulus of the real-time impedance change satisfies the protection trip condition and the delay time is reached. The protection method is applicable to var…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.