Measurement system for partial discharges on dielectrics in coaxial cables
US5854556A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1996 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Apr 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/1272
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting partial discharges in cables and accessories. An electrical interruption is created in, for example, the sheath conductor of a cable, and the voltage of high frequency signal components, created by a partial discharge, is measured across the interruption. The interruption is short-circuited to allow low frequency signals to pass across the interruption, thus preventing low frequency signals from being measured. This is useful because the signal/noise ratio of the frequency range measured according to this invention is more favourable. Also, in order to properly and accurately measure a partial discharge, it is important to relate measurements to the main supply voltage of the cable. The present invention also provides a method wherein prior to display the signal is combined with a signal representing the main supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.