A compact ten stage Marx with six parallel 40kV/5600pF capacitors per stage, developed for various pulsed power applications, is described. Every two stages have a common unattached gas switch so there are five switches that of two are trigger switch and three are self-breakdown switch. The spark gaps and capacitors are arranged radially at sixty degree intervals. Unique features of the Compact Marx include a peaking switch and a peaking capacitor that formed by the structure. It is 43cm in diameter and 67cm in height. It can generate as high as 250kV less than 5ns rise time pulse into a 100-150 ohm load.

Some high voltage applications use very fast impulses with rise time less than 100 nanoseconds. Measurements of these impulses are difficult, and a lot of different voltage dividers are used. In many cases, inadequate metrological support of calibrations of these dividers is a problem. In recent years, an etalon for very fast high voltage impulses is missing in the Czech Republic. The future aim of our work is the realization of such a reference divider. However, in the first step, it is necessary to develop suitable very fast high voltage generator, which is the subject of this paper. Realization of a stable very fast high voltage impulse generator with light and relatively low cost construction, and with rise time less than 100 nanosecond, at a voltage level of the order of 100 kV, into a capacitive load representing e.g. tested insulator, is not possible with design of common commercial impulse generators. An important part of the paper is a design of electrical circuit of the very fast impulse generator with a numerical simulation which has done limit parameters of all components of the device. Finally, the impulse generator for voltage up to 100 kilovolts and a rise time less than 50 nanoseconds has been realized. The results of verification measurements in case of two different types of voltage dividers are presented in this paper.

result

Compact repetition fast rise time Marx generator

Very fast high voltage impulse generator

This paper discusses the design of an ultra-compact, Marx-type, high-voltage generator. This system incorporates high-performance components that are closely coupled and integrated into an extremely compact assembly. Low profile, custom ceramic capacitors with coplanar extended electrodes provide primary energy storage. Low-inductance, spark-gap switches incorporate miniature gas cavities imbedded within the central region of the annular shaped capacitors, with very thin dielectric sections separating the energy storage capacitors. Carefully shaped electrodes and insulator surfaces are used throughout to minimize field enhancements, reduce fields at triple-point regions, and enable operation at stress levels closer to the intrinsic breakdown limits of the dielectric materials. Specially shaped resistors and inductors are used for charging and isolation during operation. Forward-coupling ceramic capacitors are connected across successive switch-capacitor-switch stages to assist in switching. Pressurized SF/sub 6/ gas is used for electrical insulation in the spark-gap switches and throughout the unit. The pressure housing is constructed entirely of dielectric materials, with segments that interlock with the low-profile switch bodies to provide an integrated support structure for all of the components. This ultra-compact Marx generator employs a modular design that can be sized as needed for a particular application. Units have been assembled with 4, 10, and 30 stages and operated at levels up to 100 kV per stage.

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Compact repetition fast rise time Marx generator

Citations

Very fast high voltage impulse generator

References

An ultra-compact Marx-type high-voltage generator

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