Method and apparatus for the detection of short circuits
US3970901A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Dec 6, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/087
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for the detection of short circuits in electrical installations, in particular on railway contact wires, comprising: generating a signal corresponding to the derivative with respect to time of the monitored current, comparing the generated signal with at least one limit value, indicating a short circuit if the generated signal exceeds a limit value, monitoring the behavior of the monitored current for the occurrence of a criterion indicating the probability of a short circuit, triggering a replica signal corresponding to the behavior of the monitored current from the movement of occurrence onwards as a function of the probability criterion, comparing the replica signal with at least one limit value, and indicating a short circuit if the limit value is exceeded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.