Protective relaying system
US4183072A · kind A · utility
19Cited by
5References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 23, 1977 |
| Grant date | Jan 8, 1980 |
| Priority date | — |
| Expiry date | Dec 23, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/265
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protective relaying system including a protected AC transmission line and detection means for detecting a change in propagation mode of a traveling wave propagating along the transmission line. The transmission line has a pair of line ends and a surge propagation time .tau., and the detection means is effective for comparing a value of the traveling wave as it passes one of the line ends at a time t-.tau. and a value of the traveling wave as it passes the other of the line ends at a time t after the surge propagation time has elapsed for detecting a change in wave value resulting from a change in wave propagation mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.