Patent · US Active

Method and device for monitoring capacitor bushings for an alternating-current grid

US11054486B2 · kind B2 · utility

1Cited by

2References

27Claims

0Family size

Assignee

MASCHINENFABRIK REINHAUSEN GMBH · DE

Inventors

Karsten Viereck · Teisendorf, DE
Junliang Wu · Shanghai, CN
Udo Hertel · Schwerte, DE

Key dates

Filing date	Feb 22, 2018
Grant date	Jul 6, 2021
Priority date	—
Expiry date	Jul 30, 2038

Classification

Technology area (CPC G)Physics
CPC primaryG01R27/2605
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method monitors capacitor bushings of a three-phase AC mains, which has first, second, and third mains lines respectively associated with first, second, and third: phases, capacitor bushings, and mains voltages. Each of the capacitor bushings has: a conductor connected with the associated mains line, and an electrically conductive foil enclosing the conductor. The method includes, for each of the phases: determining, at a predetermined initial instant for a characteristic variable, which is characteristic for the respective capacitor bushing, a corresponding characteristic value; determining, at a predetermined later instant after the initial instant for the characteristic variable, a corresponding normalised characteristic value in dependence on the respective characteristic value and/or on at least one of remaining characteristic values; and checking whether the normalised characteristic value has impermissibly changed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.