Device for preventive detection of faults with identification of the type of load
US6081123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1997 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Oct 24, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S40/121
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
During a first test phase, the device, after detecting the presence of a load, enables the nature of the load to be identified. For this, a control circuit connects the load to an AC main power system, while limiting the current in the load. The device measures several tens of samples of instantaneous values of the load voltage and current during a limited number of half-waves of an AC sine signal and determines the load impedance and the current/voltage phase shift. These characteristics, possibly with complementary parameters derived from the voltage and current measurements, enable the nature of the load to be identified. During a second test phase, the control circuit applies pulses limited in voltage to the load and detects possible short-circuit, differential or overload faults.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.