Device and method for monitoring a capacitor bushing
US6873159B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2001 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Jun 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/64
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method for monitoring a capacitor bushing (1) to which an electrical operating voltage (UB) is applied and in which a voltage divider is formed with an electrically conductive insert (4), whereby at least one measured value (UM1) of an electrical measured quantity (UM) is recorded and stored by using a measuring tap (7), which is connected to the insert (4), and by using each potential. The aim of the invention is to improve the method so that it is only slightly influenced by changes in the operating voltage. To this end, the impedance (ZE) between the measuring tap (7) and the earth potential is modified after recording the at least one measured value (UM1), and at least one signal value (US1) of a measurement signal (US) subsequently formed is recorded and stored using the measuring tap (7) and the earth potential. The temporal interval between the time of recording of the measured value (UM1) and the time of recording of the signal value (US1) is measured in such a manner that a change in the operating voltage (UB), which potentially occurs between both times, is negligible. The invention also relates to a device for monitoring a capacitor bushing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.