Fault detecting system for locating a fault point with a fault resistance separately measured
US4313169A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1979 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Aug 3, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/265
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
At an end (11) of a power transmission line (10), a fault detecting system monitors variations resulting from a fault in voltage and current being transmitted through the line and calculates the distance between the end and location (20) of the fault by the use of the variations and a line constant inherent to the line, such as that given by the characteristic impedance and the propagation constant, to thereby locate the fault with a sufficient accuracy by directly using the commercial frequency and without affected by the impedance that accompanies the fault. The system can calculate the fault impedance from the distance and those backward impedances seen at the end and an opposing end (12) of the line backwardly of the location of fault.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.