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Journals and Conferences
This paper presents a new group of features used for partial discharge (PD) pattern recognition, based on the description of detail and statistical characteristics of PD images by using fractal features and statistical parameters, respectively. An improved differential box-counting method is proposed for fractal dimension estimation of PD images. The new… (More)
A versatile and powerful finite-difference solution technique is developed for determining the capacitances between arrays of closely spaced parallel conductors. Results are presented for configurations typical of multilevel VLSI structures.
Modern electrical machines must be designed as rugged and flexible. The use of power electronic devices cause voltage spikes and introduce harmonics that electrically degrade the insulation of the windings in the machines. High frequency power electronic driver circuits also increase the operating temperatures, which affect the aging and breakdown… (More)
A novel design for a DC circuit breaker based on commutating the current over a series of different resistive paths through a variable resistance commutating shuttle was first described in a 2011 paper<sup>1</sup>. Since then, it has been recognized that the concept can be generalized to stationary resistors as well as moving resistors, to rotating shuttles… (More)
Modern electrical machines must be designed as rugged and flexible. The use of power electronic devices causes voltage spikes and introduces harmonics that electrically degrade the insulation of the windings in the machines. Power electronic driver circuits operate at high frequency, resulting in high electrical stress and temperatures, which affect the… (More)
In many high voltage systems, partial discharges are an indication of insulation condition. The partial discharge test is a nondestructive method of identifying possible premature insulation breakdown. Magnet wires are used in various electrical equipments like injection coils, solenoids and small transformers. The aging process of the wire insulation was… (More)
In the continued study of traditional and non-traditional types of lightning protection devices, an approach is developed to analyze the emission current due to space charge development at switching impulse voltage. Components of the SPICE model, the generator, dissipater, and air gap, allow for simulation of the emission current. The SPICE models,… (More)
The use of power electronics can increase the electrical stress for machine winding insulation. These increased electrical stresses require improvements in quality of the electrical insulation system. A popular method of testing insulation quality is the use of partial discharge measurements. When power electronics are utilized, the harmonics of applied… (More)
In this paper, an approach is presented for producing a high concentration of electromagnetic energy into small regions involving free space or non-dispersive materials. The technique utilizes an array of ultra-wideband antennas radiating short duration pulses. It is shown that precise control of the time delays of the pulses radiated from the individual… (More)
A data analysis technique is presented for extracting pole and residue content of spectral data where phase data are not available or are not accurate. The technique is applied to a sample spectrum and results are obtained to demonstrate the accuracy and limitations of the procedure.