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This paper focuses on the influence of repetitive square wave voltage rise time on partial discharge pulse characteristics in the ultra-high frequency range. Paerial Discharge (PD) tests on single-point contact crossed pairs were carried out using repetitive square wave voltages with a wide range of rise times, from 200 ns to 400 μs, including also 50 Hz sinusoidal voltage waveforms. Experimental...
This paper explores the feasibility of a new triggering technology that is based on reversed-LTD (linear transformer driver) principle. The triggering technology which is named as LTD-trigger has a similar structure to LTD device, but it operates reversely relative to LTD. The LTD-trigger is small size and can obtain multiple trigger pulsed voltages flexible with one single primary high-voltage pulsed...
High-voltage (HV) ultrashort pulse technologies have found many applications in areas such as medicine, biology, food processing, environmental science and defense. Some applications are dependent on the pulse parameters such as duration, amplitude, shape, as well as the number of pulses applied and the frequency rate. Generators that can produce powerful electrical pulses with adjustable duration,...
An all solid-state Marx modulator utilizing Insulated Gate Bipolar Translators (IGBTs) is capable of outputting pulses with variable pulse width, repetitive pulse frequency and varying voltage amplitude. But the relatively slow turn-on speed of IGBT with high current loads result in slow rise time of output pulses. If a magnetic switch (MS) is combined with an all solid-state Marx, it will be quite...
In ozone production using streamer discharges by pulsed power, the concentration of ozone is not high although ozone is produced with high efficiency. To improve ozone concentration, we studied the effects of electrode separation in a coaxial reactor using nanosecond pulsed power. We found that ozone concentration and yield increase with decreasing inside diameter of the outer electrode in the reactor...
Many studies have tested the application of pulsed electric fields to tumors during cancer therapy. In this study, we used an embryonic chick assay to test the effects of nanosecond pulsed electric fields (nsPEFs) on a solid tumor. Our experiments used the embryonic chick assay, which is classified as in vivo experiment, because it has several advantages. Mouse breast adenocarcinoma cell line EMT6/KU...
A new electron beam accelerator with beam ejection into the atmosphere has been recently developed for radiation technology application. The high-voltage nanosecond pulse generator of the accelerator is based on a low-inductance pulse transformer. A cold cathode thyratron is used as a primary switcher. The diode consists of a cathode, which provides a high delay time in the plasma formation. The electron...
Analysis of breakdown mechanism in gas-insulated trigatron switches is important for the engineering design and function prediction. Based on the gas discharge theory, a physical model was proposed to estimate the breakdown time for gas-insulated trigatron switches. And the model can explain the breakdown in the trigatron switches with two modes of the breakdown mechanism, i.e., fast breakdown mode...
A repetitive, high-voltage liquid dielectric switch for high-power microwave (HPM) applications is currently being developed and investigated at the French-German Research Institute of Saint-Louis (ISL). The switch was designed to be implemented in existing coaxial pulse line structures and is being driven by compact modular Marx generators at rise times of about 7 ns and output voltages up to 400...
A 4.8 MV impulse voltage generator and impulse current generators are used to perform lightning simulation on the Z11 helicopter radome. The radome system is composed of lightning diverter strips, air data probe and a 0.5 m long metal structure attached to the radome to simulate the helicopter body. The test facilities, process and the results are presented according to the Chinese CCAR27 standard...
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