Device and process for protecting a line of a network of electricity supply lines
US6392857B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2000 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Mar 27, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This device for protecting a line (10, 12) of a network of supply lines comprises two protective relays (18, 20; 22, 24) furnished with means for detecting faults and a circuit breaker adapted so as to disconnect the line from the network of lines in the presence of a fault, each relay being adapted so as to monitor a first zone (Z1) of the line corresponding to a zone of certain detection of a fault (10, 12) and at least one second zone (Z2) juxtaposed with the first zone and corresponding to a zone of uncertain detection of a fault. At least one of the relays comprises means for detecting the opening of the circuit breaker associated with the other relay in response to a detection, by the latter, of a fault in the first zone in such a way as to cause the opening of the circuit breaker associated with the said at least one relay (18, 20; 22, 24). The means for detecting the opening of the circuit breaker comprise means for calculating a characteristic representative of the variation of a measurement value of the impedance of the line and means for comparing this characteristic with a threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.