Control apparatus for three phase alternating current load protection
US4837654A · kind A · utility
2Cited by
4References
14Claims
0Family size
Inventors
Key dates
| Filing date | Jan 14, 1988 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Jan 14, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/253
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Control apparatus for three phase alternating current load protection wherein each of the phases of the load is connected to a corresponding current transformer. When the load is energized by a three phase power supply the transformers induce signals which are applied to a signal detection circuit. The detection circuit controls a relay means. If any of the three power phases is lost the detection circuit is interrupted causing the relay means to drop out, whereby the load, the power supply and auxilliary circuitry, as the case may be, are protected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.