Fehlererkennungsverfahren für eine Stromübertragungsleitung in einer Wechselstromversorgung

Details

Veröffentlichungs-Nr.

EP4718087

Anmeldetag

30. September 2024

Veröffentlichung

1. April 2026

Rechtsraum

EP

Abstract

The present disclosure relates to a fault detection method for a power transmission line (101) in an alternating current, AC, power transmission system (100). The method comprises:- measuring, at a local position of the power transmission line, measured local voltage phasors and measured local current phasors;- obtaining transmission properties for the power transmission line from the local position to a remote position at a distance from the local position and for associated devices, wherein the transmission properties comprise series parameters, shunt parameters, and the distance from the local position to the remote position;- estimating, for the remote position, estimated remote voltage phasors and estimated remote current phasors on basis of the measured local voltage phasors, the measured local current phasors, and the transmission properties;- receiving, via a communication link (115), data relating to remote phase currents and determining measured remote current phasors;- determining whether a fault has occurred or not on basis of at least one of a combination of the estimated and measured remote current phasors and a combination of the estimated and measured remote voltage phasors; and- determining whether a fault is a true fault or a false fault, including:o comparing a first phase angle and a first magnitude of an estimated remote positive sequence current phasor with a second phase angle and a second magnitude of a measured remote positive sequence current phasor;o determining, on basis of the comparison, whether there is a significant channel asymmetry on the communication link; ando determining that the fault is a false fault if there is a significant channel asymmetry.

Anmelder

Firma

Hitachi Energy Ltd

Land

🇨🇭 Schweiz