Arc preventing power supply system
US4037265A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1975 |
| Grant date | Jul 19, 1977 |
| Priority date | — |
| Expiry date | Nov 25, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved electrical power supply system is disclosed for preventing arcing between two or more electrical machines energized by a common power source with at least one of said machines receiving power through a lengthy power cable, said cable having a grounding conductor connecting the external conductive housing of said machine to earth ground. A unique multi-winding transformer is connected between the common power source and the cable, so that arcing attributable to voltage induced in the cable grounding conductor is limited to non-dangerous current levels by an inductive impedance from a first winding of the multi-winding transformers, which winding in series with the cable grounding conductor. However, under short circuit conditions, another winding of the multi-winding transformer overcomes the inductive impedance of the first winding so that the current carrying capacity of the cable grounding conductor is no longer limited by the impedance of the first winding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.