Differential arc reflectometry
US5083086A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1990 |
| Grant date | Jan 21, 1992 |
| Priority date | — |
| Expiry date | Jul 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Location of a fault in electrical conductors from a terminal position which may be remote from the fault using at least a broad band pulse generator to generate a pulse at a terminal position. It also uses a voltage source at the terminal position capable of inducing a change of impedance at the fault and time measuring means also at the terminal position. The method involves generating a first pulse at the terminal position which is propagated down the conductor and reflected back to the terminal position from various impedance discontinuities, including the impedance discontinuity of the fault, if present. The pattern of reflections from points along the conductor up to the fault resulting from the first pulse are recorded. Then sufficient voltage is applied to the cable to induce a change in impedance at the fault. Simultaneously a second pulse similar to the first is generated at the terminal position and reflected back from the various impedance discontinuities, including the modified impedance discontinuity at the fault. The reflections of the first pulse are then substracted from the reflections of the second pulse leaving the pulse reflected from the fault. The location of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.