Time-Domain Approach to Estimate Series Capacitance of an Isolated Phase Winding of a Transformer

Pramanik, Saurav and Satish, L (2014) Time-Domain Approach to Estimate Series Capacitance of an Isolated Phase Winding of a Transformer. In: IEEE TRANSACTIONS ON POWER DELIVERY, 29 (4). pp. 1939-1945.

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Abstract

Information available in frequency response data is equivalently available in the time domain as a response due to an impulse excitation. The idea to pursue this equivalence to estimate series capacitance is linked to the well-known fact that under impulse excitation, the line/neutral current in a transformer has three distinct components, of which, the initial capacitive component is the first to manifest, followed by the oscillatory and inductive components. Of these, the capacitive component is temporally well separated from the rest-a crucial feature permitting its direct access and analysis. Further, the winding initially behaves as a pure capacitive network, so the initial component must obviously originate from only the (series and shunt) capacitances. With this logic, it should therefore be possible to estimate series capacitance, just by measuring the initial capacitive component of line current and the total shunt capacitance. The principle of the method and details of its implementation on two actual isolated transformerwindings (uniformly wound) are presented. For implementation, a low-voltage recurrent surge generator, a current probe, and a digital oscilloscope are all that is needed. The method is simple and requires no programming and needs least user intervention, thus paving the way for its widespread use.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON POWER DELIVERY
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords:	Impulse excitation; series capacitance; time response; transformer winding
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	14 Nov 2014 07:29
Last Modified:	14 Nov 2014 07:29
URI:	http://eprints.iisc.ac.in/id/eprint/50278

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