Testing loop impedance in an RCCB electrical test circuit
US7271577B2 · kind B2 · utility
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4References
35Claims
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Key dates
| Filing date | Aug 18, 2006 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Aug 18, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for testing the loop impedance in residual current circuit breaker (RCCB) protected circuits is provided. An alternating test current is applied across the phase earth connections of a supply and a plurality of voltage samples are then taken across the connections. The voltage samples are subsequently transformed from time space to frequency space to allow the component due to the test current to be isolated. The loop impedance is then calculated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.