Method of monitoring the grading margin between time-current characteristics of intelligent electronic devices
US8981951B2 · kind B2 · utility
1Cited by
12References
6Claims
0Family size
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Key dates
| Filing date | Nov 5, 2009 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Feb 19, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of monitoring the grading margin between at least two time-current characteristics of Intelligent Electronic Devices (IEDA, IEDB) installed in an electrical power system, each Intelligent Electronic Device comprising a counting means, the grading margin comprising a safety margin set by a user, characterized in that it comprises, when a fault occurs which causes a fault current in the electrical power system, a step of providing a warning to the user when the safety margin is infringed upon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.