Circuit for verifying correct connections to a three-wire dual voltage power distribution system and the absence of open circuit conditions therein
US3944891A · kind A · utility
Inventors
Key dates
| Filing date | Apr 3, 1974 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Apr 3, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H11/002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Circuitry is utilized to interconnect loads to the power distribution system and only conducts current when voltage conditions from the system are appropriate. Therefore, the load is deenergized whenever reversed connections are made to the power distribution system, or whenever an open circuit exists in any line thereof. Latching means can be included in the circuitry to continually energize the load when an open circuit develops in either nongrounded or hot line of the power distribution system after the load has been initially energized therefrom. Furthermore, the effect of the latching means is externally controlled through a switching means so that remote circuit conditions can be synchronized therewith. When an indicating means is incorporated as the load, the circuitry functions as a detector and when the circuitry is utilized with a circuit breaker to deenergize the load, ground fault protection can be incorporated therewith.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.