Experimental results on fault simulations during impulse tests across windings and other specifically designed networks are reported. Both breakdown and partial discharge studies are conducted with digital acquisition of fault records. © 2005 IEEE.

V. Jayashankar

A. Palani

Computer simulation

Electric breakdown

Electric fault currents

IMPULSE TESTING

Partial discharges

Transformer windings

CHOPPED LIGHTNING IMPULSE TEST

Fault simulation

LIGHTNING IMPULSE TEST

Electric transformers

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Simulation of faults during impulse tests

IEEE Transactions on Power Delivery

We propose an objective formulation of the impulse analysis problem from a signal analysis viewpoint. The winding response is quintessentially that of a deterministic network to a finite energy signal, with breakdown and partial discharge being inherently nonlinear events. A significant improvement to the acquisition of waveforms is demonstrated by a virtual instrument approach. It retains the advantages of the time- and frequency-domain methods. The drawbacks of the transfer function method are highlighted and a new piecewise linear approach is proposed for analysis. Experiments on a discrete lumped parameter model of the winding are used to validate the PXI based instrument. © 2007 IEEE.

Virtual instrument for lightning impulse tests

An objective classification of faults that can occur during impulse tests on power transformers is proposed. It includes nonlinear elements, breakdown, and partial discharge events. An analysis of a layer winding in the time and frequency domains with these faults shows that current assessment methods must be used with caution. A model reference approach is proposed to distinctly improve recognition in such cases. The method is immune to changes of wave shape and the instant of fault is available by observation.

IEE Proceedings: Science, Measurement and Technology

Impulse testing of power transformers - A model reference approach

A transfer function is a reliable tool for comparison of full- and chopped lightning impulse tests

Journal	IEEE Transactions on Power Delivery
ISSN	08858977
Open Access	No