Fast breaker failure detection for HVDC circuit breakers
US8947843B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2011 |
| Grant date | Feb 3, 2015 |
| Priority date | — |
| Expiry date | Apr 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/268
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A breaker failure detection device for a direct current (DC) circuit breaker (200) is provided. The circuit breaker comprises a circuit breaking element (204) and a non-linear resistor, e.g., a surge arrester (205), connected in parallel. The breaker failure detection device comprises a current sensor (212, 213, 214, 215), for measuring a current commutating from the circuit breaking element (204), and a breaker failure detection unit (211). The breaker failure detection unit (211) is arranged for comparing the measured current to desired values and deciding that an internal commutation process of the circuit breaker (200) does not proceed as desired if the measured current deviates from the desired values. The present invention makes use of an understanding that an improved detection of breaker failures may be achieved by monitoring the internal commutation process of the circuit breaker. Further, a method of breaker failure detection is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.