Design and implementation of a digital differential relay for a 3-phase power transformer based on Kalman filtering theory

The design and implementation of a digital differential relay for a three-phase power transformer based on Kalman filtering theory are presented. The differential current is modeled as a sum of a fundamental, second harmonic, and exponentially decaying DC component, plus a random noise of known vari...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:IEEE transactions on power delivery 1988-04, Vol.3 (2), p.525-533
Hauptverfasser: Murty, Y.V.V.S., Smolinski, W.J.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The design and implementation of a digital differential relay for a three-phase power transformer based on Kalman filtering theory are presented. The differential current is modeled as a sum of a fundamental, second harmonic, and exponentially decaying DC component, plus a random noise of known variance. The fundamental and second harmonic components are optimally estimated using a five-state Kalman filter. Inrush and internal fault conditions are distinguished by the relative magnitudes of their differential currents. The algorithm is implemented on a TMS 320 digital signal processor and tested using a three-phase transformer. Results show that the relay provides good restraint for inrush conditions and the relay operation time for internal faults is less than half a cycle.< >
ISSN:0885-8977
1937-4208
DOI:10.1109/61.4289