A 4.5-MJ pulsed power supply for railgun experiments

Guercio, Miguel Del

doi:10.1109/tmag.2002.805926

Cited by 13 publications

(5 citation statements)

References 3 publications

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“…The discharging process of the pulsed power module is as follows: when the thyristor switch receives the command to trigger the discharging, it turns on singly, at which time the storage capacitor C discharges and the current supplies the load after adjusting the current waveform through the wave regulating inductor L. When the energy of the storage capacitor is released, the current flowing through the thyristor SCR is less than a specific value, the thyristor turns off by itself. Due to the energy storage characteristics of the inductor itself, the modulating inductor L stores some energy at this time, so the inductor releases energy through the renewal circuit after the crowbar diode is turned on [6][7][8][9][10]. Due to the limited energy storage of a single module, in order to provide a larger output current, it is often necessary to form a pulse-forming network from tens to hundreds of modules according to a certain topology to power a railgun system.…”

Section: Short Circuit Analysis Of Pulse Forming Unit Cablementioning

confidence: 99%

Study on discharge characteristics of pulsed power module under the condition of discharge short circuit fault

Liu,

Wang,

Minhao-Zhong

et al. 2023

J. Phys.: Conf. Ser.

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Efficiency and safety are key factors that must be emphasized in pulsed power applications. The discharge characteristics of pulsed power supply directly determine the performance of the railgun. This paper conducts a research on short-circuit faults in transmission coaxial cables of pulsed power supply. In order to study the effect of short-circuit fault on the discharge characteristics of pulsed power supply and system efficiency,a pulse-forming network with cable short-circuit failure and dynamic railgun model are established in the paper. The effect of short-circuit fault on peak current is discussed by simulation. The results show that the short-circuit fault currents are all higher than the currents under normal conditions, and the closer the short-circuit location is to the power supply side, the higher the peak value of current is. In some extreme case, the peak fault current exceeds 1.5 times the normal, which requires consideration of short-circuit fault protection measures, such as the addition of a DC circuit breakers.

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Section: Short Circuit Analysis Of Pulse Forming Unit Cablementioning

confidence: 99%

Study on discharge characteristics of pulsed power module under the condition of discharge short circuit fault

Liu,

Wang,

Minhao-Zhong

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…The size of PPS should be suitable to be integrated in a standard container. The assembly in [3] reduces risk of interference through clear division of functional area, however, at the expense of loss of waveform flexibility. The topology of the PFU is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Design and test of a compact capacitor-based energy storage pulsed power module with high repetitive discharge frequency

Wang

Liu

Feng

et al. 2023

J. Phys.: Conf. Ser.

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Advance in electromagnetic launch have put forward higher requirements for the pulsed power supply(PPS). A capacitive PPS for electromagnetic launcher has been constructed in NJUST recently with a basic cell of 220kJ energy storage, which has a good scalability. Design of integrated 220kJ pulsed power unit (PFU) was demonstrated in the paper. To meet the requirement of compact structure of PPS, the device design and system layout are considered and combined with simulation to optimize the magnetic field distribution in the constrained space. In order to achieve the function of continuous discharge, the reliability of thermal management system, control system and safety protection system are focused on. System description was presented in the paper. A series of experiments were conducted to verify the performance of the module. The results show that the PFU shows good reliability in 10 consecutive burst-shot tests. Due to the modular setup of this pulse formation network, it can be extended to a larger-scale pulse forming network. Flexible current pulse shapes can be formed by controlling the charging voltage and the trigger time of the PFU.

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“…Pulsed power technology permits the electric energy to be stored at relatively low power, and be transformed into the electromagnetic energy by pulse and then released into the load to achieve much higher instantaneous power [1]. Pulsed power technology plays an important role in controlled nuclear fusion [2], high-energy accelerator [2], and electromagnetic weapons [3][4][5][6]. For example, the pulse generator can generate high instantaneous power and low average power, which may benefit the production of plasma [7,8].…”

Section: Introductionmentioning

confidence: 99%

The Modification Mechanism of Nano-Liquids on Streamer Morphology and Breakdown Strength under Microsecond Pulse

Zhang

Liu

et al. 2020

Applied Sciences

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In liquid mediums, whether the breakdown strength can be greatly improved after introducing the nano-particles has been widely investigated, however, there has been no scientific consensus on the modification mechanism of this anomalous phenomenon. In this paper, we first experimentally measured the streamer morphology and breakdown strength in pure transformer oil, TiO2 nano-liquids and Al2O3 nano-liquids under microsecond pulse. The results demonstrated that there are significant differences in streamer morphology between pure transformer oil and nano-liquids, as the streamers in pure transformer oil exhibit thick bush-like qualities, while in nano-liquids they exhibit tree-like qualities. Moreover, the breakdown voltage results show that the breakdown strength of transformer oil is improved after nano-modification, and the TiO2 nano-liquids and Al2O3 nano-liquids have nearly the same optimal volume fraction. The results of the analysis indicate that the modification mechanism of nano-particles is significantly linked to the trapped electrons process. Specifically, the addition of nano-particles can affect the electrons’ density and thus affect the breakdown process and streamer morphology.

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A 4.5-MJ pulsed power supply for railgun experiments

Cited by 13 publications

References 3 publications

Study on discharge characteristics of pulsed power module under the condition of discharge short circuit fault

Study on discharge characteristics of pulsed power module under the condition of discharge short circuit fault

Design and test of a compact capacitor-based energy storage pulsed power module with high repetitive discharge frequency

The Modification Mechanism of Nano-Liquids on Streamer Morphology and Breakdown Strength under Microsecond Pulse

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