High-voltage (a few hundred kilovolt), short pulses (microseconds to tonanoseconds) have been found to be effective for various biologicaldecontamination applications, such as cleaning of water withbacteria/algae. Marx generators are most commonly used for thispurpose. A serious disadvantage of Marx generators is the increase inrise times due to series inductance. To alleviate this effect, peakingcapacitors have been used to produce early time, fast-rising pulsesthat the Marx generators otherwise cannot supply due to theirrelatively high series inductance. This paper presents the results ofthe design and development of a 600-kV, 50-ns-rise-time, and similar to250-ns-duration pulse generator using a peaking capacitor. A 132-kVcondenser-type bushing of 650-kV BIL and 230-pF capacitance was used asa peaking capacitor to reduce rise time. The effect of the peakingcapacitor was also studied employing circuit modeling of the generatorand the influence of various parameters was investigated. There is agood correlation between the experimental and the numerical results.
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