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...
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Veröffentlicht in: | IEEE transactions on power delivery 1988-04, Vol.3 (2), p.525-533 |
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Format: | Artikel |
Sprache: | eng |
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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.< > |
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ISSN: | 0885-8977 1937-4208 |
DOI: | 10.1109/61.4289 |