Zero sequence current source for transformer having a nonwound tertiary
US4231074A · kind A · utility
5Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1978 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Sep 18, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/162
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A three-phase electrical transformer utilizes a conductor independent of the transformer windings for sensing zero sequence current upon the occurrence of a ground fault. A current transformer coupled with the independent conductor provides polarization to protective relay devices. One embodiment utilizes the transformer internal tank shield in combination with the current transformer for providing zero sequence current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.