Monitoring partial discharge in high voltage systems

US8729906B2 · kind B2 · utility

Assignee

• ESKOM HOLDINGS SOC LIMITED · ZA

Inventor

• Simon Higgins · Cologne, DE

Key dates

• Filing date: Jul 22, 2009
• Grant date: May 20, 2014
• Expiry date: Jul 30, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/1272
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and device for monitoring partial discharges in high voltage electrical or power systems is provided. A low trigger level and a high trigger level electrical pulse amplitude levels are defined. At least one phase of the electrical system is monitored for an occurrence of a pulse within a defined minor time frame. A peak amplitude of a pulse occurring in the electrical system within the minor time frame is detected. It is determined if the detected peak amplitude of the pulse exceeds the lower and higher trigger levels. A pulse number is assigned to the pulse if the peak amplitude of the pulse exceeds the trigger levels. The pulse is captured if the pulse number associated with the pulse is less than a predetermined pulse number threshold in the minor time frame. The captured pulses are stored in a memory.