Electronic relay for calculating the power of a multiphase electric load based on a rectified wave signal and a phase current
US5777833A · kind A · utility
60Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1997 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Jan 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/382
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic relay having a current sensor device (C1, C2, C3), logic inputs (3) and an electronic circuit (4) provided with processing means capable of calculating, from the current signal (I) supplied by the current sensor device and a rectified voltage signal (V) supplied by one of the logic inputs, the value of the power factor of the motor (cos.phi.) and/or the value of the power supply voltage (U) of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.