Distanzschutz für Symmetrische Dreiphasige Fehler

Details

Veröffentlichungs-Nr.

EP4618343

Aktenzeichen

EP24162668

Anmeldetag

11. März 2024

Veröffentlichung

17. September 2025

Rechtsraum

EP

IPC

H02H3/40H02H3/00

Abstract

The present invention provides a method and device for determining an internal fault in a three-phase transmission line in a power grid including a variable renewable source, in particular a wind farm. The method comprises the steps of obtaining phase voltage signals for a reach point on the three-phase transmission line, and keeping the value of at least one phase voltage during the fault to the value of the phase voltage before the occurrence of the fault as polarized signal. The method further comprising the steps of determining reach point sequence voltages from the phase voltage signals, determining modified reach point sequence voltages by delaying one of the phase voltage signals with several power frequency cycles at the reach point, obtaining an operation quantity and a restrain quantity using the modified reach point voltages, and determining an internal symmetrical fault in the three-phase transmission line based on a comparison of the operation quantity and the restrain quantity.

Anmelder

Firma

Hitachi Energy Ltd

Land

🇨🇭 Schweiz

Fachgebiete