Verfahren zur Überwachung einer Transformatorgrundgrösse für Transformatoren mit Drei Wicklungen

Details

Veröffentlichungs-Nr.

EP4760322

Anmeldetag

12. Dezember 2024

Veröffentlichung

17. Juni 2026

Rechtsraum

EP

IPC

G01R31/62

Abstract

The present disclosure relates to transformer diagnosis methods for a transformer having a primary side source winding and two secondary side load windings. The method using relations based on a transformer model in which effects of magnetizing currents in the transformer core, leakage inductances and effective resistances of the primary and secondary windings are taken into account, wherein a transformer model of a three-winding transformer is used; transformer currents are measured during variations of the transformer loads wherein the power transferred through the respective windings are proportional; measurements are collected, for at least two different transformer loads, of a selection of primary side currents being indicative of the transformer load; a linear fits is performed by means of relations based on said transformer model, between equivalent load current and the primary current to estimate the value of at least one of the following transformer properties: turn ratio and magnetizing current.

Anmelder

Firma

Hitachi Energy Ltd

Land

🇨🇭 Schweiz