Method and apparatus for identifying open phase of circuit breaker on basis of voltage
US10267859B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 19, 2016 |
| Grant date | Apr 23, 2019 |
| Priority date | — |
| Expiry date | Feb 19, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for identifying an open phase of a circuit breaker on the basis of voltage. The method comprises: a protection apparatus measures three-phase voltages at two sides of a circuit breaker; respectively calculates a vector difference and an effective value of the voltages at two sides of the circuit breaker; when the phase voltages at two sides are both greater than 80% to 90% of a rated voltage, and the voltage vector difference at two sides of the one-phase or two-phase circuit breaker is greater than a set voltage, it is determined that the circuit breaker has an open phase; and actuates an alarming or tripping operation after a short time delay t.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.