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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/7036
Title: Adaptive digital differential protection of transformer improvement over the fixed bias scheme
Authors: Verma H.K.
Maheshwari R.P.
Published in: Journal of the Institution of Engineers (India): Electrical Engineering Division
Abstract: This paper presents an adaptive scheme, implementable on a microprocessor, for differential protection of a transformer. The transformer is continuously monitored to decide its condition and operating tap. In the event of an abnormal operation, the fundamental frequency and harmonic components of the differential current are used to identify the nature of abnormality and accordingly an indication is given and the trip decision is taken. The value of percentage bias to detect internal faults is chosen dynamically taking into account the actual CT mismatch for the operating tap alongwith the CT errors. The relay scheme has been evaluated through simulation. On internal faults it is found to have a better sensitivity and faster operation than a similar fixed-bias scheme. It does not operate on external fault, magnetizing inrush and overexcitation conditions.
Citation: Journal of the Institution of Engineers (India): Electrical Engineering Division (1996), 76(4): 218-221
URI: http://repository.iitr.ac.in/handle/123456789/7036
Issue Date: 1996
Keywords: CT mismatch
Differential current
Harmonics
Internal fault
ISSN: 203386
Author Scopus IDs: 7006175645
8941720600
Author Affiliations: Verma, H.K., Department of Electrical Engineering, University of Roorkee
Maheshwari, R.P., Department of Electrical Engineering, University of Roorkee
Corresponding Author: Department of Electrical Engineering, University of Roorkee
Appears in Collections:Journal Publications [EE]

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