Residual current monitoring type B with integrated self-test system and method
US12222371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2022 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Jun 13, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/2513
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present disclosure is a system and method for measuring AC residual current and DC residual current using a singular type-B residual current monitoring device. The system includes a sensor comprising two or more cores that measure residual AC current and residual DC current from two or more current carrying conductors through the cores that carry AC current and DC current. The system includes a controller that sends both an AC excitation current to the cores, as well as a DC nulling current that cancels out the DC residual current, allowing the system to then accurately measure the AC residual current. The system also includes a self-test feature that injects known quantities of both AC current and DC current through the sensor to determine if the sensor is functioning properly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.