Overcurrent circuit interrupter using RMS sampling
US4685024A · kind A · utility
21Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1985 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Nov 19, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H1/046
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic overcurrent circuit interrupter utilizes a digital processor for performing RMS sampling of circuit current for comparison to stored long time and short time current values and time delays before tripping the breaker. A magnetic core current transformer is employed for providing an output current signal to the digital processor. Upon detecting core saturation, which occurs at high currents, an analog detection circuit interrupts the RMS sampling and causes the digital processor to time out the shortest pre-selected time delay before tripping the breaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.