Time Domain Approach for Modelling Transformer Windings for Propagation of Fast Discharge Pulses

Raman, Santosh Janaki and Kumar, Udaya (2016) Time Domain Approach for Modelling Transformer Windings for Propagation of Fast Discharge Pulses. In: 14th International Conference on Electromagnetic Interference and Compatibility (INCEMIC), DEC 08-09, 2016, Bangalore, INDIA.

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Abstract

A qualitative knowledge on electrical stress under power frequency excitation, as well as, switching and lightning surges is essential for the design of suitable insulation. Distributed circuit model, as well as, its variants are commonly employed for evaluating surge distribution in transformer windings. However, Very fast transient overvoltage (VFTO) and Partial discharge (PD) pulse comprise of frequency components from ten to hundreds of MHz, which do not come under the purview of circuit theory. The existing methodologies for modelling windings for lightning and VFTO assume a transverse electromagnetic mode of propagation which facilitates the use of circuit elements. This is not the case with VFTO and PD pulses impinging on a transformer winding, where the wavelengths corresponding to significant upper frequency components of the pulse are comparable to the height of the winding and they are many orders lower than the circuit length. As a first step towards analysing the problem, a full wave modelling is attempted by employing the electric field integral equation in time domain (TD-EFIE). Typical one way travel time along the winding is found to be larger than the time periods encountered in allied areas, therefore, the late-time instability issues in marching on time (MOT) schemes are to be assessed for their suitability for the intended work. Three different representations for spatial, temporal basis and testing functions have been investigated and the performance has been appropriately ranked.

Item Type:	Conference Proceedings
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	12 Aug 2017 07:04
Last Modified:	12 Aug 2017 07:04
URI:	http://eprints.iisc.ac.in/id/eprint/57633

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