Transformer protection system
US4772978A · kind A · utility
15Cited by
1References
27Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 14, 1986 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Oct 14, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/045
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a transformer protection system, data of voltages and currents detected at individual terminals of a transformer connected to an electric power system are supplied to a computer. The computer computes driving point admittances or shunt admittances of the transformer on the basis of the voltage and current data and predetermined transfer admittances of the transformer and decides that an internal fault has occurred in the transformer when the values of the driving point admittances or shunt admittances deviate from pre-set reference values, thereby disconnecting the transformer from the electric power system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.