DocumentCode :
2696081
Title :
An advanced model of a high pressure liquid dielectric switch for directed energy applications
Author :
Leckbee, Joshua ; CUrry, Randy ; McDonald, Ken ; Cravey, Ray ; Grimmis, Allen
Author_Institution :
Dept. of Electr. Eng., Missouri Univ., Columbia, MO, USA
Volume :
2
fYear :
2003
fDate :
15-18 June 2003
Firstpage :
1389
Abstract :
A high power liquid dielectric switch is being developed to satisfy the requirements for future directed energy applications. A flowing, high-pressure liquid dielectric was chosen for the design of a megavolt class switch operating at 100 pps. This paper reports on the modeling efforts commensurate with the design of a full size, prototype 250-300 kV concept validation test (CVT), switch that can transfer kilojoules per pulse. The flow system required to clear the discharge bubble and byproducts is intimately tied to the dynamics of energy deposition, and bubble formation. A circuit model has been developed to predict the discharge temporal characteristics including the voltage, current, risetime, arc energy deposition profile, and time varying arc inductance, bubble formation timescales and oscillatory bubble effects. The model utilizes both the Braginskii equation and Charlie Martin´s equations to calculate the energy dissipated in the arc. A comparison of the two methods is presented. An integrated model also includes the hydrodynamic equations to predict the gas bubble volume and oscillation period, which are dramatically reduced with increasing pressure. Optimization studies indicate that a 1000-2000 psi switch appears to have ideal attributes including minimal dielectric flow requirements, compact size and low weight for implementation of a kilojoule, rep-rate switch.
Keywords :
dielectric liquids; fluid oscillations; hydrodynamics; optimisation; switches; 1000 to 2000 psi; 250 to 300 kV; Braginskii equation; Charlie Martin equation; concept validation test; dielectric flow; directed energy application; discharge temporal characteristic; energy dissipated; flow system; gas bubble volume prediction; hydrodynamic equation; liquid dielectric switch; megavolt class switch; oscillation period prediction; Circuit testing; Dielectric liquids; Equations; Hydrodynamics; Inductance; Power system modeling; Predictive models; Prototypes; Switches; Voltage-controlled oscillators;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Pulsed Power Conference, 2003. Digest of Technical Papers. PPC-2003. 14th IEEE International
Conference_Location :
Dallas, TX, USA
Print_ISBN :
0-7803-7915-2
Type :
conf
DOI :
10.1109/PPC.2003.1278075
Filename :
1278075
Link To Document :
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