Detection of a partial discharge

US11579181B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ulf Bormann · Altdorf, DE
• Martin Meyer · Nuremberg, DE
• Dirk Scheibner · Nuremberg, DE
• Jürgen Schimmer · Koblenzer Straße, DE
• Hermann-Josef Wiegand · Rasdorf, DE

Key dates

• Filing date: Aug 17, 2020
• Grant date: Feb 14, 2023
• Expiry date: Aug 17, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/346
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

With a method and a device for detecting a partial discharge at a winding of an electrical machine, electromagnetic first measuring signals are detected in a partial discharge frequency range and electromagnetic second measuring signals are detected in an interference frequency range. A time window around a first measuring signal is predefined, and an identification criterion is defined for a partial discharge signal and an interference signal criterion is defined for a second measuring signal. A determination is made as to a partial discharge when a first measuring signal is detected that meets the identification criterion and when, in the time window around the first measuring signal, no second measuring signal that meets the interference signal criterion is detected. A quality of the detected partial discharge is assessed based on a characteristic value of the second measuring signal.