W. Sarjeant

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Partial discharge (PD) detection techniques are reviewed, focusing on application in the aerospace industry. The discussion covers dielectric withstand voltage test, causes of high-voltage failures in flight hardware systems and how PD testing can detect incipient problems, and high-frequency PD test methods and applications.<<ETX>>
Many different types of capacitors are available today, most being designed for mounting on circuit boards or other electronic equipment. Generally these fall into the classes of ceramic, tantalum, electrolytic or DC film capacitors. Larger sizes of capacitors are used in applications such as motor drives and kilowatt to multimegawatt average power, power(More)
The Energy Systems Institute (ESI) of the University at Buffalo in a joint effort with the U.S. ARMY ARDEC Advanced Energy Armament Systems Center (AEASC), is working on fundamental research that will, for the first time, assist in providing highly reliable mobility systems, and systems of systems that are fault tolerant. More specifically, the key(More)
As the consumer and industrial requirements for compact, high power density, electrical power systems grow substantially over the next decade, development of high power/energy density capacitor technology is a major enabling technology component element. For microsecond to fractional-second electrical energy storage, discharge, filtering and power(More)
One of the factors that contributes to surface flashover on dielectrics is the existence of defects on the surface of the material. For our studies, excimer laser processing was utilized on alumina dielectrics in an attempt to substantially increase the threshold voltages for flashover. Through excimer laser processing, the surface material melts and(More)
Determining losses in an energy system can be more frustrating than the original design process of that system. A fusing technique utilizing a thin film planar geometry is currently being developed at the Energy Systems Institute as a pulsed light and fusing source. The thin film in question is capacitor grade, metallized polypropylene film. The film is(More)
Summary form only given. The exploding film phenomenon can exhibit a restrike, which is a high temperature, optically intense, transient plasma. Because of the characteristics of this plasma, it has a variety of applications including light sources, excitation of energetic materials, Z-pinches, and compositional analysis of materials. However, the proper(More)
A set of advanced metallized polymer film capacitors was characterized as to their partial discharge (PD) behavior. The sample set of these capacitors was each at various stages of capacitor lifetime. The stages of lifetime were new/unused, moderate/midlife, and heavy use/end of life. The onset of partial discharges was initiated via the application of dc(More)
Recent research into the exploding wire phenomenon has shown that capacitor grade metallized polypropylene film (MPPF) may perform as a surrogate to an exploding wire. The reaction of the MPPF to a high voltage capacitive discharge is similar to that of an exploding wire. A key difference that exists between the MPPF and the wire is that due to geometry,(More)
A study has been undertaken on high-pressure surface discharge switches potentially capable of moderate repetition rate operation. The parametric experiments reported were carried out utilizing the gaps as transfer switches, under pulse charging conditions, between several types of low-impedance transmission lines and a high-pressure rare-gas halide laser(More)